Circuit quantum electrodynamics is one of the most promising platforms for efficient quantum simulation and computation. In recent groundbreaking experiments, the immense flexibility of superconducting microwave resonators was utilized to realize hyperbolic lattices that emulate quantum physics in negatively curved space. Here we investigate experimentally feasible settings in which a few superconducting qubits are coupled to a bath of photons evolving on the hyperbolic lattice. We compare our numerical results for finite lattices with analytical results for continuous hyperbolic space on the Poincar{\'e} disk. We find good agreement between the two descriptions in the long-wavelength regime. We show that photon-qubit bound states have a curvature-limited size. We propose to use a qubit as a local probe of the hyperbolic bath, for example, by measuring the relaxation dynamics of the qubit. We find that, although the boundary effects strongly impact the photonic density of states, the spectral density is well described by the continuum theory. We show that interactions between qubits are mediated by photons propagating along geodesics. We demonstrate that the photonic bath can give rise to geometrically frustrated hyperbolic quantum spin models with finite-range or exponentially decaying interaction.

}, doi = {10.1103/PhysRevLett.128.013601}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.128.013601}, author = {Bienias, Przemyslaw and Boettcher, Igor and Belyansky, Ron and Kollar, Alicia J. and Gorshkov, Alexey V.} } @article {23726, title = {Digital Quantum Simulation of the Schwinger Model and Symmetry Protection with Trapped Ions}, journal = {PRX Quantum}, volume = {3}, year = {2022}, month = {May05/04/2022}, pages = {020324}, abstract = {Tracking the dynamics of physical systems in real time is a prime application of quantum computers. Using a trapped-ion system with up to six qubits, we simulate the real-time dynamics of a lattice gauge theory in\ 1+1\ dimensions, i.e., the lattice Schwinger model, and demonstrate nonperturbative effects such as pair creation for times much longer than previously accessible. We study the gate requirement of two formulations of the model using the Suzuki-Trotter product formula, as well as the trade-off between errors from the ordering of the Hamiltonian terms, the Trotter step size, and experimental imperfections. To mitigate experimental errors, a recent symmetry-protection protocol for suppressing coherent errors and a symmetry-inspired postselection scheme are applied. This work demonstrates the integrated theoretical, algorithmic, and experimental approach that is essential for efficient simulation of lattice gauge theories and other complex physical systems.

}, doi = {10.1103/PRXQuantum.3.020324}, url = {https://link.aps.org/doi/10.1103/PRXQuantum.3.020324}, author = {Nguyen, Nhung H. and Tran, Minh C. and Zhu, Yingyue and Green, Alaina M. and Alderete, C. Huerta and Davoudi, Zohreh and Linke, Norbert M.} } @article {23676, title = {Strained bilayer graphene, emergent energy scales, and moir{\'e} gravity}, journal = {Phys. Rev. Research}, volume = {4}, year = {2022}, month = {May}, pages = {L022027}, abstract = {Twisted bilayer graphene is a rich condensed matter system, which allows one to tune energy scales and electronic correlations. The low-energy physics of the resulting moir{\'e} structure can be mathematically described in terms of a diffeomorphism in a continuum formulation. We stress that twisting is just one example of moir{\'e} diffeomorphisms. Another particularly simple and experimentally relevant transformation is a homogeneous isomorphic strain of one of the layers, which gives rise to a nearly identical moir{\'e} pattern (rotated by\ 90 degrees\ relative to the twisted structure) and potentially flat bands. We further observe that low-energy physics of the strained bilayer graphene takes the form of a theory of fermions tunneling between two curved space-times. Conformal transformation of the metrics results in emergent {\textquotedblleft}moir{\'e} energy scales,{\textquotedblright} which can be tuned to be much lower than those in the native theory. This observation generalizes to an arbitrary space-time dimension with or without an underlying lattice or periodicity and suggests a family of toy models of {\textquotedblleft}moir{\'e} gravity{\textquotedblright} with low emergent energy scales. Motivated by these analogies, we present an explicit toy construction of moir{\'e} gravity, where the effective cosmological constant can be made arbitrarily small. We speculate about possible relevance of this scenario to the fundamental vacuum catastrophe in cosmology.

}, doi = {10.1103/PhysRevResearch.4.L022027}, url = {https://link.aps.org/doi/10.1103/PhysRevResearch.4.L022027}, author = {Parhizkar, Alireza and Galitski, Victor} } @article {23481, title = {Unifying Quantum and Classical Speed Limits on Observables}, journal = {Phys. Rev. X}, volume = {12}, year = {2022}, month = {Feb}, pages = {011038}, abstract = {The presence of noise or the interaction with an environment can radically change the dynamics of observables of an otherwise isolated quantum system. We derive a bound on the speed with which observables of open quantum systems evolve. This speed limit is divided into Mandelstam and Tamm{\textquoteright}s original time-energy uncertainty relation and a time-information uncertainty relation recently derived for classical systems, and both are generalized to open quantum systems. By isolating the coherent and incoherent contributions to the system dynamics, we derive both lower and upper bounds on the speed of evolution. We prove that the latter provide tighter limits on the speed of observables than previously known quantum speed limits and that a preferred basis of speed operators serves to completely characterize the observables that saturate the speed limits. We use this construction to bound the effect of incoherent dynamics on the evolution of an observable and to find the Hamiltonian that gives the maximum coherent speedup to the evolution of an observable.

}, keywords = {limits, Observables}, doi = {10.1103/PhysRevX.12.011038}, url = {https://link.aps.org/doi/10.1103/PhysRevX.12.011038}, author = {Garcia-Pintos, Luis Pedro and Nicholson, Schuyler B. and Green, Jason R. and del Campo, Adolfo and Gorshkov, Alexey V.} } @article { WOS:000652838200010, title = {Chiral Anomaly in Interacting Condensed Matter Systems}, journal = {Phys. Rev. Lett.}, volume = {126}, number = {18}, year = {2021}, month = {MAY 7}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The chiral anomaly is a fundamental quantum mechanical phenomenon which is of great importance to both particle physics and condensed matter physics alike. In the context of QED, it manifests as the breaking of chiral symmetry in the presence of electromagnetic fields. It is also known that anomalous chiral symmetry breaking can occur through interactions alone, as is the case for interacting one-dimensional systems. In this Letter, we investigate the interplay between these two modes of anomalous chiral symmetry breaking in the context of interacting Weyl semimetals. Using Fujikawa{\textquoteright}s path integral method, we show that the chiral charge continuity equation is modified by the presence of interactions which can be viewed as including the effect of the electric and magnetic fields generated by the interacting quantum matter. This can be understood further using dimensional reduction and a Luttinger liquid description of the lowest Landau level. These effects manifest themselves in the nonlinear response of the system. In particular, we find an interaction-dependent density response due to a change in the magnetic field as well as a contribution to the nonequilibrium and inhomogeneous anomalous Hall response while preserving its equilibrium value.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.126.185303}, author = {Rylands, Colin and Parhizkar, Alireza and Burkov, Anton A. and Galitski, Victor} } @article { WOS:000671590700016, title = {Comment on {\textquoteleft}{\textquoteleft}Fluctuations in Extractable Work Bound the Charging Power of Quantum Batteries{{\textquoteright}{\textquoteright}} Reply}, journal = {Phys. Rev. Lett.}, volume = {127}, number = {2}, year = {2021}, month = {JUL 9}, publisher = {AMER PHYSICAL SOC}, type = {Editorial Material}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.127.028902}, author = {Garcia-Pintos, Luis Pedro and Hamma, Alioscia and del Campo, Adolfo} } @article { WOS:000734372000007, title = {Counterexample to the conjectured Planckian bound on transport}, journal = {Phys. Rev. B}, volume = {104}, number = {23}, year = {2021}, month = {DEC 20}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {It has recently been conjectured that the transport relaxation rate in metals is bounded above by the temperature of the system. In this paper, we discuss the transport phenomenology of overdoped electron-doped cuprates, which we show constitute an unambiguous counterexample to this putative {\textquoteleft}{\textquoteleft}Planckian{{\textquoteright}{\textquoteright}} bound, raising serious questions about the efficacy of the bound.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.104.235138}, author = {Poniatowski, Nicholas R. and Sarkar, Tarapada and Lobo, Ricardo P. S. M. and Das Sarma, Sankar and Greene, Richard L.} } @article { WOS:000691406500003, title = {Demonstration of Shor Encoding on a Trapped-Ion Quantum Computer}, journal = {Phys. Rev. Appl.}, volume = {16}, number = {2}, year = {2021}, month = {AUG 30}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Fault-tolerant quantum error correction (QEC) is crucial for unlocking the true power of quantum computers. QEC codes use multiple physical qubits to encode a logical qubit, which is protected against errors at the physical qubit level. Here, we use a trapped-ion system to experimentally prepare m-qubit Greenberger-Horne-Zeilinger states and sample the measurement results to construct m x m logical states of the {[}{[}m(2), 1, m]] Shor code, up to m = 7. The synthetic logical fidelity shows how deeper encoding can compensate for additional gate errors in state preparation for larger logical states. However, the optimal code size depends on the physical error rate and we find that m = 5 has the best performance in our system. We further realize the direct logical encoding of the {[}{[}9, 1, 3]] Shor code on nine qubits in a 13-ion chain for comparison, with 98.8(1)\% and 98.5(1)\% fidelity for state vertical bar +/->(L), respectively.}, issn = {2331-7019}, doi = {10.1103/PhysRevApplied.16.024057}, author = {Nguyen, Nhung H. and Li, Muyuan and Green, Alaina M. and Alderete, C. Huerta and Zhu, Yingyue and Zhu, Daiwei and Brown, Kenneth R. and Linke, Norbert M.} } @article { WOS:000674685900002, title = {Development of Quantum Interconnects (QuICs) for Next-Generation Information Technologies}, journal = {PRX Quantum}, volume = {2}, number = {1}, year = {2021}, month = {FEB 24}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Just as {\textquoteleft}{\textquoteleft}classical{{\textquoteright}{\textquoteright}} information technology rests on a foundation built of interconnected information-processing systems, quantum information technology (QIT) must do the same. A critical component of such systems is the {\textquoteleft}{\textquoteleft}interconnect,{{\textquoteright}{\textquoteright}} a device or process that allows transfer of information between disparate physical media, for example, semiconductor electronics, individual atoms, light pulses in optical fiber, or microwave fields. While interconnects have been well engineered for decades in the realm of classical information technology, quantum interconnects (QuICs) present special challenges, as they must allow the transfer of fragile quantum states between different physical parts or degrees of freedom of the system. The diversity of QIT platforms (superconducting, atomic, solid-state color center, optical, etc.) that will form a {\textquoteleft}{\textquoteleft}quantum internet{{\textquoteright}{\textquoteright}} poses additional challenges. As quantum systems scale to larger size, the quantum interconnect bottleneck is imminent, and is emerging as a grand challenge for QIT. For these reasons, it is the position of the community represented by participants of the NSF workshop on {\textquoteleft}{\textquoteleft}Quantum Interconnects{{\textquoteright}{\textquoteright}} that accelerating QuIC research is crucial for sustained development of a national quantum science and technology program. Given the diversity of QIT platforms, materials used, applications, and infrastructure required, a convergent research program including partnership between academia, industry, and national laboratories is required.}, doi = {10.1103/PRXQuantum.2.017002}, author = {Awschalom, David and Berggren, Karl K. and Bernien, Hannes and Bhave, Sunil and Carr, Lincoln D. and Davids, Paul and Economou, Sophia E. and Englund, Dirk and Faraon, Andrei and Fejer, Martin and Guha, Saikat and Gustafsson, V, Martin and Hu, Evelyn and Jiang, Liang and Kim, Jungsang and Korzh, Boris and Kumar, Prem and Kwiat, Paul G. and Loncar, Marko and Lukin, Mikhail D. and Miller, David A. B. and Monroe, Christopher and Nam, Sae Woo and Narang, Prineha and Orcutt, Jason S. and Raymer, Michael G. and Safavi-Naeini, Amir H. and Spiropulu, Maria and Srinivasan, Kartik and Sun, Shuo and Vuckovic, Jelena and Waks, Edo and Walsworth, Ronald and Weiner, Andrew M. and Zhang, Zheshen} } @article {21096, title = {Domain-wall confinement and dynamics in a quantum simulator}, journal = {Nat. Phys.}, year = {2021}, abstract = {Particles subject to confinement experience an attractive potential that increases without bound as they separate. A prominent example is colour confinement in particle physics, in which baryons and mesons are produced by quark confinement. Confinement can also occur in low-energy quantum many-body systems when elementary excitations are confined into bound quasiparticles. Here we report the observation of magnetic domain-wall confinement in interacting spin chains with a trapped-ion quantum simulator. By measuring how correlations spread, we show that confinement can suppress information propagation and thermalization in such many-body systems. We quantitatively determine the excitation energy of domain-wall bound states from the non-equilibrium quench dynamics. We also study the number of domain-wall excitations created for different quench parameters, in a regime that is difficult to model with classical computers. This work demonstrates the capability of quantum simulators for investigating high-energy physics phenomena, such as quark collision and string breaking. Long-range Ising interactions present in one-dimensional spin chains can induce a confining potential between pairs of domain walls, slowing down the thermalization of the system. This has now been observed in a trapped-ion quantum simulator.

}, issn = {1745-2473}, doi = {10.1038/s41567-021-01194-3}, author = {Tan, W. L. and Becker, P. and Liu, F. and Pagano, G. and Collins, K. S. and De, A. and Feng, L. and Kaplan, H. B. and Kyprianidis, A. and Lundgren, R. and Morong, W. and Whitsitt, S. and Gorshkov, A. V. and Monroe, C.} } @article { WOS:000718354400005, title = {Dynamical fragile topology in Floquet crystals}, journal = {Phys. Rev. B}, volume = {104}, number = {18}, year = {2021}, month = {NOV 9}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Although fragile topology has been intensely studied in static crystals in terms of Wannier obstruction, it is not clear how to generalize the concept to dynamical systems. In this work we generalize the concept of fragile topology, and provide a definition of fragile topology for noninteracting Floquet crystals, which we refer to as dynamical fragile topology. In contrast to the static fragile topology defined by Wannier obstruction, dynamical fragile topology is defined for the nontrivial quantum dynamics characterized by the obstruction to static limits (OTSL). Specifically, the OTSL of a Floquet crystal is fragile if and only if it disappears after adding a symmetry-preserving static Hamiltonian in a direct-sum way preserving the relevant gaps (RGs). We further present a concrete 2 + 1D example for dynamical fragile topology, based on a model that is qualitatively the same as the dynamical model with anomalous chiral edge modes in Rudner et al. {[}Phys. Rev. X 3, 031005 (2013)]. The fragile OTSL in the 2 + 1D example exhibits anomalous chiral edge modes for a natural open boundary condition, and does not require any crystalline symmetries besides lattice translations. Our work paves the way to study fragile topology for general quantum dynamics.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.104.L180303}, author = {Yu, Jiabin and Ge, Yang and Das Sarma, Sankar} } @article { WOS:000661896800004, title = {Efficient Stabilized Two-Qubit Gates on a Trapped-Ion Quantum Computer}, journal = {Phys. Rev. Lett.}, volume = {126}, number = {22}, year = {2021}, month = {JUN 4}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {In order to scale up quantum processors and achieve a quantum advantage, it is crucial to economize on the power requirement of two-qubit gates, make them robust to drift in experimental parameters, and shorten the gate times. Applicable to all quantum computer architectures whose two-qubit gates rely on phase-space closure, we present here a new gate-optimizing principle according to which negligible amounts of gate fidelity are traded for substantial savings in power, which, in turn, can be traded for substantial increases in gate speed and/or qubit connectivity. As a concrete example, we illustrate the method by constructing optimal pulses for entangling gates on a pair of ions within a trapped-ion chain, one of the leading quantum computing architectures. Our method is direct, noniterative, and linear, and, in some parameter regimes, constructs gate-steering pulses requiring up to an order of magnitude less power than the standard method. Additionally, our method provides increased robustness to mode drift. We verify the new trade-off principle experimentally on our trapped-ion quantum computer.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.126.220503}, author = {Blumel, Reinhold and Grzesiak, Nikodem and Nguyen, Nhung H. and Green, Alaina M. and Li, Ming and Maksymov, Andrii and Linke, Norbert M. and Nam, Yunseong} } @article { WOS:000679983800006, title = {Energy storage and coherence in closed and open quantum batteries}, journal = {Quantum}, volume = {5}, year = {2021}, month = {JUL 15}, publisher = {VEREIN FORDERUNG OPEN ACCESS PUBLIZIERENS QUANTENWISSENSCHAF}, type = {Article}, abstract = {We study the role of coherence in closed and open quantum batteries. We obtain upper bounds to the work performed or energy exchanged by both closed and open quantum batteries in terms of coherence. Specifically, we show that the energy storage can be bounded by the Hilbert-Schmidt coherence of the density matrix in the spectral basis of the unitary operator that encodes the evolution of the battery. We also show that an analogous bound can be obtained in terms of the battery{\textquoteright}s Hamiltonian coherence in the basis of the unitary operator by evaluating their commutator. We apply these bounds to a 4state quantum system and the anisotropic XY Ising model in the closed system case, and the Spin-Boson model in the open case.}, issn = {2521-327X}, author = {Caravelli, Francesco and Yan, Bin and Garcia-Pintos, Luis Pedro and Hamma, Alioscia} } @article { WOS:000733435400002, title = {Enhancement of superconductivity with external phonon squeezing}, journal = {Phys. Rev. B}, volume = {104}, number = {22}, year = {2021}, month = {DEC 1}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Squeezing of phonons due to the nonlinear coupling to electrons is a way to enhance superconductivity as theoretically studied in a recent work {[}Kennes et al., Nat. Phys. 13, 479 (2017)]. We study quadratic electronphonon interaction in the presence of phonon pumping and an additional external squeezing. Interference between these two driving sources induces a phase-sensitive enhancement of electron-electron attraction, which we find as a generic mechanism to enhance any boson-mediated interactions. The strongest enhancement of superconductivity is shown to be on the boundary with the dynamical lattice instabilities caused by driving. We propose several experimental platforms to realize our scheme.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.104.L220503}, author = {Grankin, Andrey and Hafezi, Mohammad and Galitski, Victor M.} } @article {green_how_2021, title = {How to profit from quantum technology without building quantum computers}, journal = {Nat. Rev. Phys.}, volume = {3}, number = {3}, year = {2021}, note = {Place: CAMPUS, 4 CRINAN ST, LONDON, N1 9XW, ENGLAND Publisher: SPRINGERNATURE Type: Editorial Material}, month = {mar}, pages = {150{\textendash}152}, abstract = {There are a number of lower risk opportunities to invest in quantum technologies, other than quantum computers, but to make the most of them both specialist knowledge and market awareness are required.}, doi = {10.1038/s42254-021-00290-w}, author = {Green, Dmitry and Soller, Henning and Oreg, Yuval and Galitski, Victor} } @article {briles_hybrid_2021, title = {Hybrid {InP} and {SiN} integration of an octave-spanning frequency comb}, journal = {APL Phontonics}, volume = {6}, number = {2}, year = {2021}, note = {Place: 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA Publisher: AMER INST PHYSICS Type: Article}, month = {feb}, abstract = {Implementing optical-frequency combs with integrated photonics will enable wider use of precision timing signals. Here, we explore the generation of an octave-span, Kerr-microresonator frequency comb using hybrid integration of an InP distributed-feedback laser and a SiN photonic-integrated circuit. We demonstrate electrically pumped and fiber-packaged prototype systems, enabled by self-injection locking. This direct integration of a laser and a microresonator circuit without previously used intervening elements, such as optical modulators and isolators, necessitates understanding self-injection-locking dynamics with octave-span Kerr solitons. In particular, system architectures must adjust to the strong coupling of microresonator backscattering and laser-microresonator frequency detuning that we uncover here. Our work illustrates critical considerations toward realizing a self-referenced frequency comb with integrated photonics.}, issn = {2378-0967}, doi = {10.1063/5.0035452}, author = {Briles, Travis C. and Yu, Su-Peng and Chang, Lin and Xiang, Chao and Guo, Joel and Kinghorn, David and Moille, Gregory and Srinivasan, Kartik and Bowers, John E. and Papp, Scott B.} } @article { WOS:000652838500026, title = {Inelastic Scattering of a Photon by a Quantum Phase Slip}, journal = {Phys. Rev. Lett.}, volume = {126}, number = {19}, year = {2021}, month = {MAY 12}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Spontaneous decay of a single photon is a notoriously inefficient process in nature irrespective of the frequency range. We report that a quantum phase-slip fluctuation in high-impedance super-conducting waveguides can split a single incident microwave photon into a large number of lower-energy photons with a near unit probability. The underlying inelastic photon-photon interaction has no analogs in nonlinear optics. Instead, the measured decay rates are explained without adjustable parameters in the framework of a new model of a quantum impurity in a Luttinger liquid. Our result connects circuit quantum electrodynamics to critical phenomena in two-dimensional boundary quantum field theories, important in the physics of strongly correlated systems. The photon lifetime data represent a rare example of verified and useful quantum many-body simulation.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.126.197701}, author = {Kuzmin, R. and Grabon, N. and Mehta, N. and Burshtein, A. and Goldstein, M. and Houzet, M. and Glazman, I, L. and Manucharyan, V. E.} } @article {21336, title = {Lieb-Robinson Light Cone for Power-Law Interactions}, journal = {Phys. Rev. Lett.}, volume = {127}, year = {2021}, month = {Oct}, pages = {160401}, abstract = {The Lieb-Robinson theorem states that information propagates with a finite velocity in quantum systems on a lattice with nearest-neighbor interactions. What are the speed limits on information propagation in quantum systems with power-law interactions, which decay as\ 1/rα\ at distance\ r? Here, we present a definitive answer to this question for all exponents\ α\>2d\ and all spatial dimensions\ d. Schematically, information takes time at least\ rmin{1,α-2d}\ to propagate a distance\ r. As recent state transfer protocols saturate this bound, our work closes a decades-long hunt for optimal Lieb-Robinson bounds on quantum information dynamics with power-law interactions.

}, doi = {10.1103/PhysRevLett.127.160401}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.127.160401}, author = {Tran, Minh C. and Guo, Andrew Y. and Baldwin, Christopher L. and Ehrenberg, Adam and Gorshkov, Alexey V. and Lucas, Andrew} } @article {dehghani_light-induced_2021, title = {Light-induced topological superconductivity via {Floquet} interaction engineering}, journal = {Phys. Rev. Res.}, volume = {3}, number = {2}, year = {2021}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {apr}, abstract = {We propose a mechanism for light-induced unconventional superconductivity in a two-valley semiconductor with a massive Dirac-type band structure. The superconducting phase results from the out-of-equilibrium excitation of carriers in the presence of Coulomb repulsion and is stabilized by coupling the driven semiconductor to a bosonic or fermionic thermal bath. We consider a circularly polarized light pump and show that by controlling the detuning of the pump frequency relative to the band gap, different types of chiral superconductivity would be induced. The emergence of novel superconducting states, such as the chiral p-wave pairing, results from the Floquet engineering of the interaction. This is realized by modifying the form of the Coulomb interaction by projecting it into the states that are resonant with the pump frequency. We show that the resulting unconventional pairing in our system can host topologically protected chiral bound states. We discuss a promising experimental platform to realize our proposal and detect the signatures of the emergent superconducting state.}, doi = {10.1103/PhysRevResearch.3.023039}, author = {Dehghani, Hossein and Hafezi, Mohammad and Ghaemi, Pouyan} } @article { WOS:000735454800008, title = {Loschmidt echo of far-from-equilibrium fermionic superfluids}, journal = {Ann. Phys.}, volume = {435}, number = {2, SI}, year = {2021}, month = {DEC}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, type = {Article}, abstract = {Non-analyticities in the logarithm of the Loschmidt echo, known as dynamical quantum phase transitions {[}DQPTs], are a recently introduced attempt to classify the myriad of possible phenomena which can occur in far from equilibrium closed quantum systems. In this work, we analytically investigate the Loschmidt echo in nonequilibrium s-wave and topological p(x) + ip(y) fermionic superfluids. We find that the presence of non-analyticities in the echo is not invariant under global rotations of the superfluid phase. We remedy this deficiency by introducing a more general notion of a grand canonical Loschmidt echo. Overall, our study shows that DQPTs are not a good indicator for the long time dynamics of an interacting system. In particular, there are no DQPTs to tell apart distinct dynamical phases of quenched BCS superconductors. Nevertheless, they can signal a quench induced change in the topology and also keep track of solitons emerging from unstable stationary states of a BCS superconductor. (C) 2021 Elsevier Inc. All rights reserved.}, issn = {0003-4916}, doi = {10.1016/j.aop.2021.168554}, author = {Rylands, Colin and Yuzbashyan, Emil A. and Gurarie, Victor and Zabalo, Aidan and Galitski, Victor} } @article { WOS:000663144400001, title = {Machine-learning enhanced dark soliton detection in Bose-Einstein condensates}, journal = {Mach. Learn.-Sci. Technol.}, volume = {2}, number = {3}, year = {2021}, month = {SEP}, publisher = {IOP PUBLISHING LTD}, type = {Article}, abstract = {Most data in cold-atom experiments comes from images, the analysis of which is limited by our preconceptions of the patterns that could be present in the data. We focus on the well-defined case of detecting dark solitons-appearing as local density depletions in a Bose-Einstein condensate (BEC)-using a methodology that is extensible to the general task of pattern recognition in images of cold atoms. Studying soliton dynamics over a wide range of parameters requires the analysis of large datasets, making the existing human-inspection-based methodology a significant bottleneck. Here we describe an automated classification and positioning system for identifying localized excitations in atomic BECs utilizing deep convolutional neural networks to eliminate the need for human image examination. Furthermore, we openly publish our labeled dataset of dark solitons, the first of its kind, for further machine learning research.}, keywords = {convolutional neural network, dark solitons, machine learning}, doi = {10.1088/2632-2153/abed1e}, author = {Guo, Shangjie and Fritsch, Amilson R. and Greenberg, Craig and Spielman, I. B. and Zwolak, Justyna P.} } @article {carney_mechanical_2021, title = {Mechanical quantum sensing in the search for dark matter}, journal = {Quantum Sci. Technol.}, volume = {6}, number = {2}, year = {2021}, note = {Place: TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND Publisher: IOP PUBLISHING LTD Type: Article}, month = {apr}, abstract = {Numerous astrophysical and cosmological observations are best explained by the existence of dark matter, a mass density which interacts only very weakly with visible, baryonic matter. Searching for the extremely weak signals produced by this dark matter strongly motivate the development of new, ultra-sensitive detector technologies. Paradigmatic advances in the control and readout of massive mechanical systems, in both the classical and quantum regimes, have enabled unprecedented levels of sensitivity. In this white paper, we outline recent ideas in the potential use of a range of solid-state mechanical sensing technologies to aid in the search for dark matter in a number of energy scales and with a variety of coupling mechanisms.}, keywords = {dark matter, Optomechanics, quantum sensing, standard quantum limits}, issn = {2058-9565}, doi = {10.1088/2058-9565/abcfcd}, author = {Carney, D. and Krnjaic, G. and Moore, D. C. and Regal, C. A. and Afek, G. and Bhave, S. and Brubaker, B. and Corbitt, T. and Cripe, J. and Crisosto, N. and Geraci, A. and Ghosh, S. and Harris, J. G. E. and Hook, A. and Kolb, E. W. and Kunjummen, J. and Lang, R. F. and Li, T. and Lin, T. and Liu, Z. and Lykken, J. and Magrini, L. and Manley, J. and Matsumoto, N. and Monte, A. and Monteiro, F. and Purdy, T. and Riedel, C. J. and Singh, R. and Singh, S. and Sinha, K. and Taylor, J. M. and Qin, J. and Wilson, D. J. and Zhao, Y.} } @article {walter_observation_2021, title = {Observation of an {Electric} {Quadrupole} {Transition} in a {Negative} {Ion}: {Experiment} and {Theory}}, journal = {Phys. Rev. Lett.}, volume = {126}, number = {8}, year = {2021}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, abstract = {The first direct experimental observation of an electric quadrupole (E2) absorption transition between bound states of an atomic negative ion has been made. The transition was observed in the negative ion of bismuth by resonant (1 + 1) photon detachment from Bi- via P-3(2) -{\textgreater} P-3(0) excitation. The E2 transition properties were completely independently calculated using a hybrid theoretical approach to account for the strong multilevel electron interactions and relativistic effects. The experimental and ab initio theoretical results are in excellent agreement, providing valuable new insight into this complex system and forbidden transitions in negative ions more generally.

}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.126.083001}, author = {Walter, C. W. and Spielman, S. E. and Ponce, R. and Gibson, N. D. and Yukich, J. N. and Cheung, C. and Safronova, M. S.} } @article {21526, title = {Observation of {Stark} many-body localization without disorder}, journal = {Nature}, volume = {599}, year = {2021}, pages = {393{\textendash}398}, abstract = {Thermalization is a ubiquitous process of statistical physics, in which a physical system reaches an equilibrium state that is defined by a few global properties such as temperature. Even in isolated quantum many-body systems, limited to reversible dynamics, thermalization typically prevails1. However, in these systems, there is another possibility: many-body localization (MBL) can result in preservation of a non-thermal state2,3. While disorder has long been considered an essential ingredient for this phenomenon, recent theoretical work has suggested that a quantum many-body system with a spatially increasing field{\textemdash}but no disorder{\textemdash}can also exhibit MBL4, resulting in {\textquoteleft}Stark MBL{\textquoteright}5. Here we realize Stark MBL in a trapped-ion quantum simulator and demonstrate its key properties: halting of thermalization and slow propagation of correlations. Tailoring the interactions between ionic spins in an effective field gradient, we directly observe their microscopic equilibration for a variety of initial states, and we apply single-site control to measure correlations between separate regions of the spin chain. Furthermore, by engineering a varying gradient, we create a disorder-free system with coexisting long-lived thermalized and non-thermal regions. The results demonstrate the unexpected generality of MBL, with implications about the fundamental requirements for thermalization and with potential uses in engineering long-lived non-equilibrium quantum matter.

}, issn = {1476-4687}, doi = {10.1038/s41586-021-03988-0}, url = {https://doi.org/10.1038/s41586-021-03988-0}, author = {Morong, W. and Liu, F. and Becker, P. and Collins, K. S. and Feng, L. and Kyprianidis, A. and Pagano, G. and You, T. and Gorshkov, A. V. and Monroe, C.} } @article { WOS:000668996900008, title = {Optical flux pump in the quantum Hall regime}, journal = {Phys. Rev. B}, volume = {103}, number = {24}, year = {2021}, month = {JUN 28}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {A seminal gedankenexperiment by Laughlin describes the charge transport in quantum Hall systems via the pumping of flux. Here, we propose an optical scheme which probes and manipulates quantum Hall systems in a similar way: When light containing orbital angular momentum interacts with electronic Landau levels, it acts as a flux pump which radially moves the electrons through the sample. We investigate this effect for a graphene system with Corbino geometry and calculate the radial current in the absence of any electric potential bias. Remarkably, the current is robust against the disorder which is consistent with the lattice symmetry, and in the weak excitation limit, the current shows a power-law scaling with intensity characterized by the novel exponent 2/3.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.103.L241301}, author = {Cao, Bin and Grass, Tobias and Solomon, Glenn and Hafezi, Mohammad} } @article {brady_optimal_2021, title = {Optimal {Protocols} in {Quantum} {Annealing} and {Quantum} {Approximate} {Optimization} {Algorithm} {Problems}}, journal = {Phys. Rev. Lett.}, volume = {126}, number = {7}, year = {2021}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {feb}, abstract = {Quantum annealing (QA) and the quantum approximate optimization algorithm (QAOA) are two special cases of the following control problem: apply a combination of two Hamiltonians to minimize the energy of a quantum state. Which is more effective has remained unclear. Here we analytically apply the framework of optimal control theory to show that generically, given a fixed amount of time, the optimal procedure has the pulsed (or {\textquotedblleft}bang-bang{\textquotedblright}) structure of QAOA at the beginning and end but can have a smooth annealing structure in between. This is in contrast to previous works which have suggested that bang-bang (i.e., QAOA) protocols are ideal. To support this theoretical work, we carry out simulations of various transverse field Ising models, demonstrating that bang-anneal-bang protocols are more common. The general features identified here provide guideposts for the nascent experimental implementations of quantum optimization algorithms.

}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.126.070505}, author = {Brady, Lucas T. and Baldwin, Christopher L. and Bapat, Aniruddha and Kharkov, Yaroslav and Gorshkov, Alexey V} } @article {21211, title = {Optimal State Transfer and Entanglement Generation in Power-Law Interacting Systems}, journal = {Phys. Rev. X}, volume = {11}, year = {2021}, month = {Jul}, pages = {031016}, abstract = {We present an optimal protocol for encoding an unknown qubit state into a multiqubit Greenberger-Horne-Zeilinger-like state and, consequently, transferring quantum information in large systems exhibiting power-law (1/rα) interactions. For all power-law exponents\ α\ between\ d\ and\ 2d+1, where\ d\ is the dimension of the system, the protocol yields a polynomial speed-up for\ α\>2d\ and a superpolynomial speed-up for\ α<=2d, compared to the state of the art. For all\ α\>d, the protocol saturates the Lieb-Robinson bounds (up to subpolynomial corrections), thereby establishing the optimality of the protocol and the tightness of the bounds in this regime. The protocol has a wide range of applications, including in quantum sensing, quantum computing, and preparation of topologically ordered states. In addition, the protocol provides a lower bound on the gate count in digital simulations of power-law interacting systems.

}, keywords = {quantum algorithms, quantum computing}, doi = {10.1103/PhysRevX.11.031016}, url = {https://link.aps.org/doi/10.1103/PhysRevX.11.031016}, author = {Tran, Minh C. and Guo, Andrew Y. and Deshpande, Abhinav and Lucas, Andrew and Gorshkov, Alexey V.} } @article { WOS:000665821600002, title = {Optimal two-qubit circuits for universal fault-tolerant quantum computation}, journal = {npj Quantum Inform.}, volume = {7}, number = {1}, year = {2021}, month = {JUN 22}, publisher = {NATURE RESEARCH}, type = {Article}, abstract = {We study two-qubit circuits over the Clifford+CS gate set, which consists of the Clifford gates together with the controlled-phase gate CS = diag(1, 1, 1, i). The Clifford+CS gate set is universal for quantum computation and its elements can be implemented fault-tolerantly in most error-correcting schemes through magic state distillation. Since non-Clifford gates are typically more expensive to perform in a fault-tolerant manner, it is often desirable to construct circuits that use few CS gates. In the present paper, we introduce an efficient and optimal synthesis algorithm for two-qubit Clifford+CS operators. Our algorithm inputs a Clifford+CS operator U and outputs a Clifford+CS circuit for U, which uses the least possible number of CS gates. Because the algorithm is deterministic, the circuit it associates to a Clifford+CS operator can be viewed as a normal form for that operator. We give an explicit description of these normal forms and use this description to derive a worst-case lower bound of 5log(2)(1/epsilon)+O(1) on the number of CS gates required to epsilon-approximate elements of SU(4). Our work leverages a wide variety of mathematical tools that may find further applications in the study of fault-tolerant quantum circuits.}, doi = {10.1038/s41534-021-00424-z}, author = {Glaudell, Andrew N. and Ross, Neil J. and Taylor, Jacob M.} } @article {safronova_predicting_2021, title = {Predicting quasibound states of negative ions: {La}- as a test case}, journal = {Phys. Rev. A}, volume = {103}, number = {2}, year = {2021}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {feb}, abstract = {We demonstrated the accurate prediction of a quasibound spectrum of a negative ion using a high-precision theoretical approach. We used La as a test case due to a recent experiment that measured energies of 11 resonances in its photodetachment spectrum attributed to transitions to quasibound states [Phys. Rev. A 102, 042812 (2020)]. We identified all of the observed resonances and predicted one more peak just outside the range of the prior experiment. Following the theoretical prediction, the peak was observed at the predicted wavelength, validating the identification. The same approach is applicable to a wide range of negative ions.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.103.022819}, author = {Safronova, M. S. and Cheung, C. and Kozlov, M. G. and Spielman, S. E. and Gibson, N. D. and Walter, C. W.} } @article { WOS:000655978400001, title = {Programmable quantum simulations of spin systems with trapped ions}, journal = {Rev. Mod. Phys.}, volume = {93}, number = {2}, year = {2021}, month = {APR 7}, publisher = {AMER PHYSICAL SOC}, type = {Review}, abstract = {Laser-cooled and trapped atomic ions form an ideal standard for the simulation of interacting quantum spin models. Effective spins are represented by appropriate internal energy levels within each ion, and the spins can be measured with near-perfect efficiency using state-dependent fluorescence techniques. By applying optical fields that exert optical dipole forces on the ions, their Coulomb interaction can be modulated to produce long-range and tunable spin-spin interactions that can be reconfigured by shaping the spectrum and pattern of the laser fields in a prototypical example of a quantum simulator. Here the theoretical mapping of atomic ions to interacting spin systems, the preparation of complex equilibrium states, and the study of dynamical processes in these many-body interacting quantum systems are reviewed, and the use of this platform for optimization and other tasks is discussed. The use of such quantum simulators for studying spin models may inform our understanding of exotic quantum materials and shed light on the behavior of interacting quantum systems that cannot be modeled with conventional computers.}, issn = {0034-6861}, doi = {10.1103/RevModPhys.93.025001}, author = {Monroe, C. and Campbell, W. C. and Duan, L-M and Gong, Z-X and Gorshkov, V, A. and Hess, P. W. and Islam, R. and Kim, K. and Linke, N. M. and Pagano, G. and Richerme, P. and Senko, C. and Yao, N. Y.} } @article { WOS:000734388900001, title = {Quantum Many-Body Topology of Quasicrystals}, journal = {Phys. Rev. X}, volume = {11}, number = {4}, year = {2021}, month = {DEC 14}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {In this paper, we characterize quasicrystalline interacting topological phases of matter, i.e., phases protected by some quasicrystalline structure. We show that the elasticity theory of quasicrystals, which accounts for both {\textquoteleft}{\textquoteleft}phonon{{\textquoteright}{\textquoteright}} and {\textquoteleft}{\textquoteleft}phason{{\textquoteright}{\textquoteright}} modes, admits nontrivial quantized topological terms with far richer structure than their crystalline counterparts. We show that these terms correspond to distinct phases of matter and also uncover intrinsically quasicrystalline phases, which have no crystalline analogs. For quasicrystals with internal U(1) symmetry, we discuss a number of interpretations and physical implications of the topological terms, including constraints on the mobility of dislocations in d = 2 quasicrystals and a quasicrystalline generalization of the Lieb-Schultz-Mattis-Oshikawa-Hastings theorem. We then extend these ideas much further and address the complete classification of quasicrystalline topological phases, including systems with point-group symmetry as well as noninvertible phases. We hence obtain the {\textquoteleft}{\textquoteleft}quasicrystalline equivalence principle,{{\textquoteright}{\textquoteright}} which generalizes the classification of crystalline topological phases to the quasicrystalline setting.}, issn = {2160-3308}, doi = {10.1103/PhysRevX.11.041051}, author = {Else, V, Dominic and Huang, Sheng-Jie and Prem, Abhinav and Gromov, Andrey} } @article { WOS:000691579200002, title = {Quantum routing with fast reversals}, journal = {Quantum}, volume = {5}, year = {2021}, month = {AUG 31}, publisher = {VEREIN FORDERUNG OPEN ACCESS PUBLIZIERENS QUANTENWISSENSCHAF}, type = {Article}, abstract = {We present methods for implementing arbitrary permutations of qubits under interaction constraints. Our protocols make use of previous methods for rapidly reversing the order of qubits along a path. Given nearest-neighbor interactions on a path of length n, we show that there exists a constant epsilon approximate to 0.034 such that the quantum routing time is at most (1 - epsilon)n, whereas any SWAP-based protocol needs at least time n - 1. This represents the first known quantum advantage over SWAP-based routing methods and also gives improved quantum routing times for realistic architectures such as grids. Furthermore, we show that our algorithm approaches a quantum routing time of 2n/3 in expectation for uniformly random permutations, whereas SWAP-based protocols require time n asymptotically. Additionally, we consider sparse permutations that route k <= n qubits and give algorithms with quantum routing time at most n/3 + O(k(2)) on paths and at most 2r/3 + O(k(2)) on general graphs with radius r.}, issn = {2521-327X}, author = {Bapat, Aniruddha and Childs, Andrew M. and V. Gorshkov, Alexey and King, Samuel and Schoute, Eddie and Shastri, Hrishee} } @article { WOS:000674685900003, title = {Quantum Simulators: Architectures and Opportunities}, journal = {PRX Quantum}, volume = {2}, number = {1}, year = {2021}, month = {FEB 24}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Quantum simulators are a promising technology on the spectrum of quantum devices from specialized quantum experiments to universal quantum computers. These quantum devices utilize entanglement and many-particle behavior to explore and solve hard scientific, engineering, and computational problems. Rapid development over the last two decades has produced more than 300 quantum simulators in operation worldwide using a wide variety of experimental platforms. Recent advances in several physical architectures promise a golden age of quantum simulators ranging from highly optimized special purpose simulators to flexible programmable devices. These developments have enabled a convergence of ideas drawn from fundamental physics, computer science, and device engineering. They have strong potential to address problems of societal importance, ranging from understanding vital chemical processes, to enabling the design of new materials with enhanced performance, to solving complex computational problems. It is the position of the community, as represented by participants of the National Science Foundation workshop on {\textquoteleft}{\textquoteleft}Programmable Quantum Simulators,{{\textquoteright}{\textquoteright}} that investment in a national quantum simulator program is a high priority in order to accelerate the progress in this field and to result in the first practical applications of quantum machines. Such a program should address two areas of emphasis: (1) support for creating quantum simulator prototypes usable by the broader scientific community, complementary to the present universal quantum computer effort in industry; and (2) support for fundamental research carried out by a blend of multi-investigator, multidisciplinary collaborations with resources for quantum simulator software, hardware, and education. This document is a summary from a U.S. National Science Foundation supported workshop held on 16-17 September 2019 in Alexandria, VA. Attendees were charged to identify the scientific and community needs, opportunities, and significant challenges for quantum simulators over the next 2-5 years.}, doi = {10.1103/PRXQuantum.2.017003}, author = {Altman, Ehud and Brown, Kenneth R. and Carleo, Giuseppe and Carr, Lincoln D. and Demler, Eugene and Chin, Cheng and DeMarco, Brian and Economou, Sophia E. and Eriksson, Mark A. and Fu, Kai-Mei C. and Greiner, Markus and Hazzard, Kaden R. A. and Hulet, Randall G. and Kollar, Alicia J. and Lev, Benjamin L. and Lukin, Mikhail D. and Ma, Ruichao and Mi, Xiao and Misra, Shashank and Monroe, Christopher and Murch, Kater and Nazario, Zaira and Ni, Kang-Kuen and Potter, Andrew C. and Roushan, Pedram and Saffman, Mark and Schleier-Smith, Monika and Siddiqi, Irfan and Simmonds, Raymond and Singh, Meenakshi and Spielman, I. B. and Temme, Kristan and Weiss, David S. and Vuckovic, Jelena and Vuletic, Vladan and Ye, Jun and Zwierlein, Martin} } @article { WOS:000655928700001, title = {Quench Dynamics of a Fermi Gas with Strong Nonlocal Interactions}, journal = {Phys. Rev. X}, volume = {11}, number = {2}, year = {2021}, month = {MAY 17}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We induce strong nonlocal interactions in a 2D Fermi gas in an optical lattice using Rydberg dressing. The system is approximately described by a t - V model on a square lattice where the fermions experience isotropic nearest-neighbor interactions and are free to hop only along one direction. We measure the interactions using many-body Ramsey interferometry and study the lifetime of the gas in the presence of tunneling, finding that tunneling does not reduce the lifetime. To probe the interplay of nonlocal interactions with tunneling, we investigate the short-time-relaxation dynamics of charge-density waves in the gas. We find that strong nearest-neighbor interactions slow down the relaxation. Our work opens the door for quantum simulations of systems with strong nonlocal interactions such as extended Fermi-Hubbard models.}, issn = {2160-3308}, doi = {10.1103/PhysRevX.11.021036}, author = {Guardado-Sanchez, Elmer and Spar, Benjamin M. and Schauss, Peter and Belyansky, Ron and Young, Jeremy T. and Bienias, Przemyslaw and Gorshkov, V, Alexey and Iadecola, Thomas and Bakr, Waseem S.} } @article { WOS:000704615000003, title = {Real-time quantum calculations of phase shifts using wave packet time delays}, journal = {Phys. Rev. D}, volume = {104}, number = {5}, year = {2021}, month = {SEP 16}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We present a method to extract the phase shift of a scattering process using the real-time evolution in the early and intermediate stages of the collision in order to estimate the time delay of a wave packet. This procedure is convenient when using noisy quantum computers for which the asymptotic out-state behavior is unreachable. We demonstrate that the challenging Fourier transforms involved in the state preparation and measurements can be implemented in 1 + 1 dimensions with current trapped ion devices and IBM quantum computers. We compare quantum computations of the time delays obtained in the one-particle quantum mechanics limit and the scalable quantum field theory formulation with accurate numerical results. We discuss the finite volume effects in the Wigner formula connecting time delays to phase shifts. The results reported involve two- and four-qubit calculations, and we discuss the possibility of larger scale computations in the near future.}, issn = {2470-0010}, doi = {10.1103/PhysRevD.104.054507}, author = {Gustafson, Erik and Zhu, Yingyue and Dreher, Patrick and Linke, Norbert M. and Meurice, Yannick} } @article {poniatowski_resistivity_2021, title = {Resistivity saturation in an electron-doped cuprate}, journal = {Phys. Rev. B}, volume = {103}, number = {2}, year = {2021}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {jan}, abstract = {We report the observation of resistivity saturation in lightly doped (x = 0.08) as-grown samples of the electron-doped cuprate La2-xCexCuO4. The saturation occurs at resistivity values roughly consistent with the phenomenological Mott-Ioffe-Regel criterion once the low effective carrier density of these materials is included in the analysis. These results imply that, at least for light doping, the high-temperature metallic phase of these materials is not necessarily strange and may be understood as simply a low-density metal.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.103.L020501}, author = {Poniatowski, Nicholas R. and Sarkar, Tarapada and Das Sarma, Sankar and Greene, Richard L.} } @article { WOS:000658822200035, title = {Roaming pathways and survival probability in real-time collisional dynamics of cold and controlled bialkali molecules}, journal = {Sci Rep}, volume = {11}, number = {1}, year = {2021}, month = {MAY 19}, publisher = {NATURE RESEARCH}, type = {Article}, abstract = {Perfectly controlled molecules are at the forefront of the quest to explore chemical reactivity at ultra low temperatures. Here, we investigate for the first time the formation of the long-lived intermediates in the time-dependent scattering of cold bialkali 23Na87Rb molecules with and without the presence of infrared trapping light. During the nearly 50 nanoseconds mean collision time of the intermediate complex, we observe unconventional roaming when for a few tens of picoseconds either NaRb or Na2 and Rb2 molecules with large relative separation are formed before returning to the four-atom complex. We also determine the likelihood of molecular loss when the trapping laser is present during the collision. We find that at a wavelength of 1064 nm the Na2Rb2 complex is quickly destroyed and thus that the 23Na87Rb molecules are rapidly lost.}, issn = {2045-2322}, doi = {10.1038/s41598-021-90004-0}, author = {Klos, Jacek and Guan, Qingze and Li, Hui and Li, Ming and Tiesinga, Eite and Kotochigova, Svetlana} } @article { WOS:000707419200012, title = {Singularities in nearly uniform one-dimensional condensates due to quantum diffusion}, journal = {Phys. Rev. A}, volume = {104}, number = {4}, year = {2021}, month = {OCT 14}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Dissipative systems often exhibit wavelength-dependent loss rates. One prominent example is Rydberg polaritons formed by electromagnetically induced transparency, which have long been a leading candidate for studying the physics of interacting photons and also hold promise as a platform for quantum information. In this system, dissipation is in the form of quantum diffusion, i.e., proportional to k(2) (k being the wavevector) and vanishing at long wavelengths as k -> 0. Here, we show that one-dimensional condensates subject to this type of loss are unstable to long-wavelength density fluctuations in an unusual manner: after a prolonged period in which the condensate appears to relax to a uniform state, local depleted regions quickly form and spread ballistically throughout the system. We connect this behavior to the leading-order equation for the nearly uniform condensate-a dispersive analog to the Kardar-Parisi-Zhang equation-which develops singularities in finite time. Furthermore, we show that the wavefronts of the depleted regions are described by purely dissipative solitons within a pair of hydrodynamic equations, with no counterpart in lossless condensates. We close by discussing conditions under which such singularities and the resulting solitons can be physically realized.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.104.L041303}, author = {Baldwin, C. L. and Bienias, P. and Gorshkov, V, A. and Gullans, M. J. and Maghrebi, M.} } @article { WOS:000672657300001, title = {Solitons in lattice field theories via tight-binding supersymmetry}, journal = {J. High Energy Phys.}, number = {7}, year = {2021}, month = {JUL 9}, publisher = {SPRINGER}, type = {Article}, abstract = {Reflectionless potentials play an important role in constructing exact solutions to classical dynamical systems (such as the Korteweg-de Vries equation), non-perturbative solutions of various large-N field theories (such as the Gross-Neveu model), and closely related solitonic solutions to the Bogoliubov-de Gennes equations in the theory of superconductivity. These solutions rely on the inverse scattering method, which reduces these seemingly unrelated problems to identifying reflectionless potentials of an auxiliary one-dimensional quantum scattering problem. There are several ways of constructing these potentials, one of which is quantum mechanical supersymmetry (SUSY). In this paper, motivated by recent experimental platforms, we generalize this framework to develop a theory of lattice solitons. We first briefly review the classical inverse scattering method in the continuum limit, focusing on the Korteweg-de Vries (KdV) equation and SU(N) Gross-Neveu model in the large N limit. We then generalize this methodology to lattice versions of interacting field theories. Our analysis hinges on the use of trace identities, which are relations connecting the potential of an equation of motion to the scattering data. For a discrete Schrodinger operator, such trace identities had been known as far back as Toda; however, we derive a new set of identities for the discrete Dirac operator. We then use these identities in a lattice Gross-Neveu and chiral Gross-Neveu (Nambu-Jona-Lasinio) model to show that lattice solitons correspond to reflectionless potentials associated with the discrete scattering problem. These models are of significance as they are equivalent to a mean-field theory of a lattice superconductor. To explicitly construct these solitons, we generalize supersymmetric quantum mechanics to tight-binding models. We show that a matrix transformation exists that maps a tight-binding model to an isospectral one which shares the same structure and scattering properties. The corresponding soliton solutions have both modulated hopping and onsite potential, the former of which has no analogue in the continuum limit. We explicitly compute both topological and non-topological soliton solutions as well as bound state spectra in the aforementioned models.}, keywords = {Lattice Integrable Models, Lattice Quantum Field Theory, Solitons Monopoles and Instantons}, issn = {1029-8479}, doi = {10.1007/JHEP07(2021)055}, author = {Balasubramanian, Shankar and Patoary, Abu and Galitski, Victor} } @article { WOS:000655930100005, title = {Topological Defect Engineering and PT Symmetry in Non-Hermitian Electrical Circuits}, journal = {Phys. Rev. Lett.}, volume = {126}, number = {21}, year = {2021}, month = {MAY 28}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We employ electric circuit networks to study topological states of matter in non-Hermitian systems enriched by parity-time symmetry PT and chiral symmetry anti-PT (APT). The topological structure manifests itself in the complex admittance bands which yields excellent measurability and signal to noise ratio. We analyze the impact of PT-symmetric gain and loss on localized edge and defect states in a non-Hermitian Su-Schrieffer-Heeger (SSH) circuit. We realize all three symmetry phases of the system, including the APT-symmetric regime that occurs at large gain and loss. We measure the admittance spectrum and eigenstates for arbitrary boundary conditions, which allows us to resolve not only topological edge states, but also a novel PT-symmetric Z(2) invariant of the bulk. We discover the distinct properties of topological edge states and defect states in the phase diagram. In the regime that is not PT symmetric, the topological defect state disappears and only reemerges when APT symmetry is reached, while the topological edge states always prevail and only experience a shift in eigenvalue. Our findings unveil a future route for topological defect engineering and tuning in non-Hermitian systems of arbitrary dimension.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.126.215302}, author = {Stegmaier, Alexander and Imhof, Stefan and Helbig, Tobias and Hoefmann, Tobias and Lee, Ching Hua and Kremer, Mark and Fritzsche, Alexander and Feichtner, Thorsten and Klembt, Sebastian and Hofling, Sven and Boettcher, Igor and Fulga, Ion Cosma and Ma, Libo and Schmidt, Oliver G. and Greiter, Martin and Kiessling, Tobias and Szameit, Alexander and Thomale, Ronny} } @article { WOS:000655094800001, title = {Towards integrated photonic interposers for processing octave-spanning microresonator frequency combs}, journal = {Light-Sci. Appl.}, volume = {10}, number = {1}, year = {2021}, month = {MAY 26}, publisher = {SPRINGERNATURE}, type = {Article}, abstract = {Microcombs-optical frequency combs generated in microresonators-have advanced tremendously in the past decade, and are advantageous for applications in frequency metrology, navigation, spectroscopy, telecommunications, and microwave photonics. Crucially, microcombs promise fully integrated miniaturized optical systems with unprecedented reductions in cost, size, weight, and power. However, the use of bulk free-space and fiber-optic components to process microcombs has restricted form factors to the table-top. Taking microcomb-based optical frequency synthesis around 1550 nm as our target application, here, we address this challenge by proposing an integrated photonics interposer architecture to replace discrete components by collecting, routing, and interfacing octave-wide microcomb-based optical signals between photonic chiplets and heterogeneously integrated devices. Experimentally, we confirm the requisite performance of the individual passive elements of the proposed interposer-octave-wide dichroics, multimode interferometers, and tunable ring filters, and implement the octave-spanning spectral filtering of a microcomb, central to the interposer, using silicon nitride photonics. Moreover, we show that the thick silicon nitride needed for bright dissipative Kerr soliton generation can be integrated with the comparatively thin silicon nitride interposer layer through octave-bandwidth adiabatic evanescent coupling, indicating a path towards future system-level consolidation. Finally, we numerically confirm the feasibility of operating the proposed interposer synthesizer as a fully assembled system. Our interposer architecture addresses the immediate need for on-chip microcomb processing to successfully miniaturize microcomb systems and can be readily adapted to other metrology-grade applications based on optical atomic clocks and high-precision navigation and spectroscopy.}, issn = {2047-7538}, doi = {10.1038/s41377-021-00549-y}, author = {Rao, Ashutosh and Moille, Gregory and Lu, Xiyuan and Westly, Daron A. and Sacchetto, Davide and Geiselmann, Michael and Zervas, Michael and Papp, Scott B. and Bowers, John and Srinivasan, Kartik} } @article {19321, title = {Tunable quantum interference using a topological source of indistinguishable photon pairs}, journal = {Nature Photonics}, year = {2021}, abstract = {Sources of quantum light, in particular correlated photon pairs that are indistinguishable for all degrees of freedom, are the fundamental resource for photonic quantum computation and simulation. Although such sources have been recently realized using integrated photonics, they offer limited ability to tune the spectral and temporal correlations between generated photons because they rely on a single component, such as a ring resonator. Here, we demonstrate a tunable source of indistinguishable photon pairs using dual-pump spontaneous four-wave mixing in a topological system comprising a two-dimensional array of resonators. We exploit the linear dispersion of the topological edge states to tune the spectral bandwidth (by about 3.5{\texttimes}), and thereby, to tune quantum interference between generated photons by tuning the two pump frequencies. We demonstrate energy-time entanglement and, using numerical simulations, confirm the topological robustness of our source. Our results could lead to tunable, frequency-multiplexed quantum light sources for photonic quantum technologies.

}, doi = {10.1038/s41566-021-00810-1}, url = {https://doi.org/10.1038/s41566-021-00810-1}, author = {Sunil Mittal and Venkata Vikram Orre and Elizabeth A. Goldschmidt and Mohammad Hafezi} } @article {19291, title = {Tunable Three-Body Loss in a Nonlinear Rydberg Medium}, journal = {Phys. Rev. Lett.}, volume = {126}, year = {2021}, month = {Apr}, pages = {173401}, abstract = {Long-range Rydberg interactions, in combination with electromagnetically induced transparency (EIT), give rise to strongly interacting photons where the strength, sign, and form of the interactions are widely tunable and controllable. Such control can be applied to both coherent and dissipative interactions, which provides the potential for generating novel few-photon states. Recently it has been shown that Rydberg-EIT is a rare system in which three-body interactions can be as strong or stronger than two-body interactions. In this work, we study three-body scattering loss for Rydberg-EIT in a wide regime of single and two-photon detunings. Our numerical simulations of the full three-body wave function and analytical estimates based on Fermi{\textquoteright}s golden rule strongly suggest that the observed features in the outgoing photonic correlations are caused by the resonant enhancement of the three-body losses.

}, doi = {10.1103/PhysRevLett.126.173401}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.126.173401}, author = {Ornelas-Huerta, D. P. and Bienias, Przemyslaw and Craddock, Alexander N. and Gullans, Michael J. and Hachtel, Andrew J. and Kalinowski, Marcin and Lyon, Mary E. and Gorshkov, Alexey V. and Rolston, S. L. and Porto, J. V.} } @article { WOS:000688493300002, title = {Z(2) topological order and first-order quantum phase transitions in systems with combinatorial gauge symmetry}, journal = {Phys. Rev. B}, volume = {104}, number = {8}, year = {2021}, month = {AUG 24}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We study a generalization of the two-dimensional transverse-field Ising model, combining both ferromagnetic and antiferromagnetic two-body interactions, that hosts exact global and local Z(2) gauge symmetries. Using exact diagonalization and stochastic series expansion quantum Monte Carlo methods, we confirm the existence of the topological phase in line with previous theoretical predictions. Our simulation results show that the transition between the confined topological phase and the deconfined paramagnetic phase is of first order, in contrast to the conventional Z(2) lattice gauge model in which the transition maps onto that of the standard Ising model and is continuous. We further generalize the model by replacing the transverse field on the gauge spins with a ferromagnetic XX interaction while keeping the local gauge symmetry intact. We find that the Z(2) topological phase remains stable, while the paramagnetic phase is replaced by a ferromagnetic phase. The topological-ferromagnetic quantum phase transition is also of first order. For both models, we discuss the low-energy spinon and vison excitations of the topological phase and their avoided level crossings associated with the first-order quantum phase transitions.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.104.085145}, author = {Wu, Kai-Hsin and Yang, Zhi-Cheng and Green, Dmitry and Sandvik, Anders W. and Chamon, Claudio} } @article { WOS:000685127300001, title = {Z(3) Quantum Double in a Superconducting Wire Array}, journal = {PRX Quantum}, volume = {2}, number = {3}, year = {2021}, month = {AUG 13}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We show that a Z(3) quantum double can be realized in an array of superconducting wires coupled via Josephson junctions. With a suitably chosen magnetic flux threading the system, the interwire Josephson couplings take the form of a complex Hadamard matrix, which possesses combinatorial gauge symmetry-a local Z(3) symmetry involving permutations and shifts by +/- 2 pi/3 of the superconducting phases. The sign of the star potential resulting from the Josephson energy is inverted in this physical realization, leading to a massive degeneracy in the nonzero flux sectors. A dimerization pattern encoded in the capacitances of the array lifts up these degeneracies, resulting in a Z(3) topologically ordered state. Moreover, this dimerization pattern leads to a larger effective vison gap as compared to the canonical case with the usual (uninverted) star term. We further show that our model maps to a quantum three-state Potts model under a duality transformation. We argue, using a combination of bosonization and mean field theory, that altering the dimerization pattern of the capacitances leads to a transition from the Z(3) topological phase into a quantum XY-ordered phase. Our work highlights that combinatorial gauge symmetry can serve as a design principle to build quantum double models using systems with realistic interactions.}, doi = {10.1103/PRXQuantum.2.030327}, author = {Yang, Zhi-Cheng and Green, Dmitry and Yu, Hongji and Chamon, Claudio} } @article { ISI:000563770700009, title = {Backaction-evading impulse measurement with mechanical quantum sensors}, journal = {Phys. Rev. A}, volume = {102}, number = {2}, year = {2020}, month = {AUG 21}, pages = {023525}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The quantum measurement of any observable naturally leads to noise added by the act of measurement. Approaches to evade or reduce this noise can lead to substantial improvements in a wide variety of sensors, from laser interferometers to precision magnetometers and more. In this paper, we develop a measurement protocol based upon pioneering work by the gravitational wave community which allows for reduction of added noise from measurement by coupling an optical field to the momentum of a small mirror. As a specific implementation, we present a continuous measurement protocol using a double-ring optomechanical cavity. We demonstrate that, with experimentally relevant parameters, this protocol can lead to significant backaction noise evasion, yielding measurement noise below the standard quantum limit over many decades of frequency.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.102.023525}, author = {Ghosh, Sohitri and Carney, Daniel and Shawhan, Peter and Taylor, Jacob M.} } @article { ISI:000570300500002, title = {Beyond spontaneous emission: Giant atom bounded in the continuum}, journal = {Phys. Rev. A}, volume = {102}, number = {3}, year = {2020}, month = {SEP 8}, pages = {033706}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The quantum coupling of individual superconducting qubits to microwave photons leads to remarkable experimental opportunities. Here we consider the phononic case where the qubit is coupled to an electromagnetic surface acoustic wave antenna that enables supersonic (electromagnetic) propagation of the qubit oscillations. This can be considered as a giant atom that is many phonon wavelengths long. We study an exactly solvable toy model that captures these effects, and find that this non-Markovian giant atom has a suppressed relaxation, so long as an effective vacuum coupling exists between a qubit excitation and a localized wave packet of sound, even in the absence of a cavity for the sound waves. Finally, we consider practical implementations of these ideas in current surface acoustic wave devices.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.102.033706}, author = {Guo, Shangjie and Wang, Yidan and Purdy, Thomas and Taylor, Jacob} } @article {raines_cavity_2020, title = {Cavity {Higgs} polaritons}, journal = {Phys. Rev. Res.}, volume = {2}, number = {1}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {feb}, abstract = {Motivated by the dramatic success of realizing cavity exciton-polariton condensation in experiment we consider the formation of polaritons from cavity photons and the amplitude or Higgs mode of a superconductor. Enabled by the recently predicted and observed supercurrent-induced linear coupling between these excitations and light, we find that hybridization between Higgs excitations in a disordered quasi-2D superconductor and resonant cavity photons can occur, forming Higgs-polariton states. This provides the potential for a new means to manipulate the superconducting state as well as the potential for novel photonic cavity circuit elements.}, doi = {10.1103/PhysRevResearch.2.013143}, author = {Raines, Zachary M. and Allocca, Andrew A. and Hafezi, Mohammad and Galitski, Victor M.} } @article {liu_circuit_2020, title = {Circuit complexity across a topological phase transition}, journal = {Phys. Rev. Res.}, volume = {2}, number = {1}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {mar}, abstract = {We use Nielsen{\textquoteright}s geometric approach to quantify the circuit complexity in a one-dimensional Kitaev chain across a topological phase transition. We find that the circuit complexities of both the ground states and nonequilibrium steady states of the Kitaev model exhibit nonanalytical behaviors at the critical points, and thus can be used to detect both equilibrium and dynamical topological phase transitions. Moreover, we show that the locality property of the real-space optimal Hamiltonian connecting two different ground states depends crucially on whether the two states belong to the same or different phases. This provides a concrete example of classifying different gapped phases using Nielsen{\textquoteright}s circuit complexity. We further generalize our results to a Kitaev chain with long-range pairing, and we discuss generalizations to higher dimensions. Our result opens up an avenue for using circuit complexity as a tool to understand quantum many-body systems.}, doi = {10.1103/PhysRevResearch.2.013323}, author = {Liu, Fangli and Whitsitt, Seth and Curtis, Jonathan B. and Lundgren, Rex and Titum, Paraj and Yang, Zhi-Cheng and Garrison, James R. and Gorshkov, V, Alexey} } @article { ISI:000571724100001, title = {A comparison of g((1)) (tau), g((3/2))(tau), and g((2))(tau) for radiation from harmonic oscillators in Brownian motion with a coherent background}, journal = {Phys. Scr.}, volume = {95}, number = {10}, year = {2020}, month = {OCT}, pages = {104001}, publisher = {IOP PUBLISHING LTD}, type = {Article}, abstract = {We compare the field-fieldg((1))(tau), intensity-fieldg((3/2))(tau), and intensity-intensityg((2))(tau) correlation functions for models that are of relevance in astrophysics. We obtain expressions for the general case of a chaotic radiation, where the amplitude is Rician based on a model with an ensemble of harmonic oscillators in Brownian motion. We obtain the signal to noise ratios for two methods of measurement. The intensity-field correlation function signal to noise ratio scales with the first power of vertical bar g((1))(tau). This is in contrast with the well-established result of g((2))(t)((2))(tau) which goes as the square of vertical bar g((1))(tau)vertical bar.}, keywords = {astrophysics, field correlation, intensity correlation, intensity-field correlation, Statistical Physics}, issn = {0031-8949}, doi = {10.1088/1402-4896/abac37}, author = {Siciak, A. and Hugbart, M. and Guerin, W. and Kaiser, R. and Orozco, L. A.} } @article { ISI:000557736300003, title = {Detection of the Lowest-Lying Odd-Parity Atomic Levels in Actinium}, journal = {Phys. Rev. Lett.}, volume = {125}, number = {7}, year = {2020}, month = {AUG 10}, pages = {073001}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Two lowest-energy odd-parity atomic levels of actinium, 7s(2)7p(2)P(1/2)(0), 7s(2)7p(2)P(3/)(2)(0), were observed via two-step resonant laser-ionization spectroscopy and their respective energies were measured to be 7477.36(4) and 12 276.59(2) cm(-1). The lifetimes of these states were determined as 668(11) and 255(7) ns, respectively. In addition, we observed the effect of the hyperfine structure on the line for the transition to P-2(3)/2(0). These properties were calculated using a hybrid approach that combines configuration interaction and coupled-cluster methods, in good agreement with the experiment. The data are of relevance for understanding the complex atomic spectra of actinides and for developing efficient laser cooling and ionization schemes for actinium, with possible applications for high-purity medical-isotope production and future fundamental physics experiments.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.125.073001}, author = {Zhang, Ke and Studer, Dominik and Weber, Felix and Gadelshin, Vadim M. and Kneip, Nina and Raeder, Sebastian and Budker, Dmitry and Wendt, Klaus and Kieck, Tom and Porsev, Sergey G. and Cheung, Charles and Safronova, Marianna S. and Kozlov, Mikhail G.} } @article { ISI:000530026700003, title = {Drag viscosity of metals and its connection to Coulomb drag}, journal = {Phys. Rev. B}, volume = {101}, number = {19}, year = {2020}, month = {MAY 4}, pages = {195106}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Recent years have seen a surge of interest in studies of hydrodynamic transport in electronic systems. We investigate the electron viscosity of metals and find a component that is closely related to Coulomb drag. By using linear-response theory, viscosity, which is a transport coefficient for momentum, can be extracted from the retarded correlation function of the momentum flux, i.e., the stress tensor. There exists a previously overlooked contribution to the shear viscosity from the interacting part of the stress tensor which accounts for the momentum flow induced by interactions. This contribution, which we dub drag viscosity, is caused by the frictional drag force due to long-range interactions. It is therefore linked to Coulomb drag which also originates from the interaction-induced drag force. Starting from the Kubo formula and using the Keldysh technique, we compute the drag viscosity of two- and three-dimensional metals along with the drag resistivity of double-layer two-dimensional electronic systems. Both the drag resistivity and drag viscosity exhibit a crossover from quadraticin-T behavior at low temperatures to a linear behavior at higher temperatures. Although the drag viscosity appears relatively small compared with the normal Drude component for the clean metals, it may dominate hydrodynamic transport in some systems, which are discussed in the conclusion.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.101.195106}, author = {Liao, Yunxiang and Galitski, Victor} } @article { ISI:000544526900013, title = {Early-Time Exponential Instabilities in Nonchaotic Quantum Systems}, journal = {Phys. Rev. Lett.}, volume = {125}, number = {1}, year = {2020}, month = {JUL 1}, pages = {014101}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The majority of classical dynamical systems are chaotic and exhibit the butterfly effect: a minute change in initial conditions has exponentially large effects later on. But this phenomenon is difficult to reconcile with quantum mechanics. One of the main goals in the field of quantum chaos is to establish a correspondence between the dynamics of classical chaotic systems and their quantum counterparts. In isolated systems in the absence of decoherence, there is such a correspondence in dynamics, but it usually persists only over a short time window, after which quantum interference washes out classical chaos. We demonstrate that quantum mechanics can also play the opposite role and generate exponential instabilities in classically nonchaotic systems within this early-time window. Our calculations employ the out-of-time-ordered correlator (OTOC)-a diagnostic that reduces to the Lyapunov exponent in the classical limit but is well defined for general quantum systems. We show that certain classically nonchaotic models, such as polygonal billiards, demonstrate a Lyapunov-like exponential growth of the OTOC at early times with Planck{\textquoteright}s-constant-dependent rates. This behavior is sharply contrasted with the slow early-time growth of the analog of the OTOC in the systems{\textquoteright} classical counterparts. These results suggest that classical-to-quantum correspondence in dynamics is violated in the OTOC even before quantum interference develops.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.125.014101}, author = {Rozenbaume, Efim B. and Bunimovich, Leonid A. and Galitski, Victor} } @article { ISI:000509352500053, title = {Effect of imperfect homodyne visibility on multi-spatial-mode two-mode squeezing measurements}, journal = {Opt. Express}, volume = {28}, number = {1}, year = {2020}, month = {JAN 6}, pages = {652-664}, publisher = {OPTICAL SOC AMER}, type = {Article}, abstract = {We study the effect of homodyne detector visibility on the measurement of quadrature squeezing for a spatially multi-mode source of two-mode squeezed light. Sources like optical parametric oscillators (OPO) typically produce squeezing in a single spatial mode because the nonlinear medium is within a mode-selective optical cavity. For such a source, imperfect interference visibility in the homodyne detector couples in additional vacuum noise, which can be accounted for by introducing an equivalent loss term. In a free-space multi-spatial-mode system imperfect homodyne detector visibility can couple in uncorrelated squeezed modes, and hence can cause faster degradation of the measured squeezing. We show experimentally the dependence of the measured squeezing level on the visibility of homodyne detectors used to probe two-mode squeezed states produced by a free space tour-wave mixing process in Rb-85 vapor, and also demonstrate that a simple theoretical model agrees closely with the experimental data. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement}, issn = {1094-4087}, doi = {10.1364/OE.379033}, author = {Gupta, Prasoon and Speirs, Rory W. and Jones, Kevin M. and Lett, Paul D.} } @article { ISI:000510841200002, title = {Electron-induced massive dynamics of magnetic domain walls}, journal = {Phys. Rev. B}, volume = {101}, number = {5}, year = {2020}, month = {FEB 4}, pages = {054407}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We study the dynamics of domain walls (DWs) in a metallic, ferromagnetic nanowire, focusing on inertial effects on the DW due to interaction with a conduction electron bath. We develop a Keldysh collective coordinate technique to describe the effect of conduction electrons on rigid magnetic structures. The effective Lagrangian and Langevin equations of motion for a DW are derived microscopically, including the full response kernel which is nonlocal in time. The DW dynamics is described by two collective degrees of freedom: position and tilt angle. The coupled Langevin equations therefore involve two correlated noise sources, leading to a generalized fluctuation-dissipation theorem (FDT). The DW response kernel due to electrons contains two parts: one related to dissipation via FDT and another reactive part. We prove that the latter term leads to a mass for both degrees of freedom, even though the intrinsic bare mass is zero. The electron-induced mass is present even in a clean system without pinning or specifically engineered potentials. The resulting equations of motion contain rich dynamical solutions and point toward a way to control domain wall motion in metals via the electronic system properties. We discuss two observable consequences of the mass, hysteresis in the DW dynamics, and resonant response to ac current.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.101.054407}, author = {Hurst, Hilary M. and Galitski, Victor and Heikkila, Tero T.} } @article { ISI:000562629600008, title = {Engineering quantum Hall phases in a synthetic bilayer graphene system}, journal = {Phys. Rev. B}, volume = {102}, number = {8}, year = {2020}, month = {AUG 26}, pages = {085430}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Synthetic quantum Hall bilayer (SQHB), realized by optically driven monolayer graphene in the quantum Hall regime, provides a flexible platform for engineering quantum Hall phases as discussed in Ghazaryan et al. {[}Phys. Rev. Lett. 119, 247403 (2017)]. The coherent driving which couples two Landau levels mimics an effective tunneling between synthetic layers. The tunneling strength, the effective Zeeman coupling, and two-body interaction matrix elements are tunable by varying the driving frequency and the driving strength. Using infinite density matrix renormalization group techniques combined with exact diagonalization, we show that the system exhibits a non-Abelian bilayer Fibonacci phase at filling fraction nu = 2/3. Moreover, at integer filling nu = 1, the SQHB exhibits quantum Hall ferromagnetism. Using Hartree-Fock theory and exact diagonalization, we show that excitations of the quantum Hall ferromagnet are topological textures known as skyrmions.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.102.085430}, author = {Cian, Ze-Pei and Grass, Tobias and Vaezi, Abolhassan and Liu, Zhao and Hafezi, Mohammad} } @article {eldredge_entanglement_2020, title = {Entanglement bounds on the performance of quantum computing architectures}, journal = {Phys. Rev. Res.}, volume = {2}, number = {3}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {aug}, abstract = {There are many possible architectures of qubit connectivity that designers of future quantum computers will need to choose between. However, the process of evaluating a particular connectivity graph{\textquoteright}s performance as a quantum architecture can be difficult. In this paper, we show that a quantity known as the isoperimetric number establishes a lower bound on the time required to create highly entangled states. This metric we propose counts resources based on the use of two-qubit unitary operations, while allowing for arbitrarily fast measurements and classical feedback. We use this metric to evaluate the hierarchical architecture proposed by A. Bapat et al. [Phys. Rev. A 98, 062328 (2018)] and find it to be a promising alternative to the conventional grid architecture. We also show that the lower bound that this metric places on the creation time of highly entangled states can be saturated with a constructive protocol, up to a factor logarithmic in the number of qubits.}, doi = {10.1103/PhysRevResearch.2.033316}, author = {Eldredge, Zachary and Zhou, Leo and Bapat, Aniruddha and Garrison, James R. and Deshpande, Abhinav and Chong, Frederic T. and Gorshkov, V, Alexey} } @article { ISI:000562633900003, title = {Exotic Photonic Molecules via Lennard-Jones-like Potentials}, journal = {Phys. Rev. Lett.}, volume = {125}, number = {9}, year = {2020}, month = {AUG 26}, pages = {093601}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Ultracold systems offer an unprecedented level of control of interactions between atoms. An important challenge is to achieve a similar level of control of the interactions between photons. Towards this goal, we propose a realization of a novel Lennard-Jones-like potential between photons coupled to the Rydberg states via electromagnetically induced transparency (EIT). This potential is achieved by tuning Rydberg states to a Forster resonance with other Rydberg states. We consider few-body problems in 1D and 2D geometries and show the existence of self-bound clusters ({{\textquoteright}{\textquoteright}}molecules{{\textquoteright}{\textquoteright}}) of photons. We demonstrate that for a few-body problem, the multibody interactions have a significant impact on the geometry of the molecular ground state. This leads to phenomena without counterparts in conventional systems: For example, three photons in two dimensions preferentially arrange themselves in a line configuration rather than in an equilateral-triangle configuration. Our result opens a new avenue for studies of many-body phenomena with strongly interacting photons.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.125.093601}, author = {Bienias, Przemyslaw and Gullans, Michael J. and Kalinowski, Marcin and Craddock, Alexander N. and Ornelas-Huerta, Dalia P. and Rolston, S. L. and Porto, V, J. and Gorshkov, V, Alexey} } @article { ISI:000526522000042, title = {Extreme ultraviolet photon conversion efficiency of tetraphenyl butadiene}, journal = {Appl. Optics}, volume = {59}, number = {4}, year = {2020}, month = {FEB 1}, pages = {1217-1224}, publisher = {OPTICAL SOC AMER}, type = {Article}, abstract = {Extreme ultraviolet (EUV) radiation can be converted to visible light using tetraphenyl butadiene (TPB) as a phosphor. 1 mu m films of TPB were prepared using thermal vapor deposition of the pure material and by spin coating suspensions of TPB in high-molecular-weight polystyrene/toluene solutions. Calibrated sources and detectors were used to determine the effective photon conversion efficiency of the films for incident EUV radiation in the wavelength range of 125 nm <= lambda <= 200 nm. After exposure to atmosphere, the efficiency of the vapor-deposited films decreased significantly, while the efficiency of the spin-coated films remained unchanged. The production of TPB films by spin coating offers the advantages of simplicity and long-term stability. (C) 2020 Optical Society of America}, issn = {1559-128X}, doi = {10.1364/AO.380185}, author = {Graybill, Joshua R. and Shahi, Chandra B. and Coplan, Michael A. and Thompson, Alan K. and Vest, Robert E. and Clark, Charles W.} } @article {hurst_feedback_2020, title = {Feedback induced magnetic phases in binary {Bose}-{Einstein} condensates}, journal = {Phys. Rev. Res.}, volume = {2}, number = {4}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {dec}, abstract = {Weak measurement in tandem with real-time feedback control is a new route toward engineering novel nonequilibrium quantum matter. Here we develop a theoretical toolbox for quantum feedback control of multicomponent Bose-Einstein condensates (BECs) using backaction-limited weak measurements in conjunction with spatially resolved feedback. Feedback in the form of a single-particle potential can introduce effective interactions that enter into the stochastic equation governing system dynamics. The effective interactions are tunable and can be made analogous to Feshbach resonances-spin independent and spin dependent-but without changing atomic scattering parameters. Feedback cooling prevents runaway heating due to measurement backaction and we present an analytical model to explain its effectiveness. We showcase our toolbox by studying a two-component BEC using a stochastic mean-field theory, where feedback induces a phase transition between easy-axis ferromagnet and spin-disordered paramagnet phases. We present the steady-state phase diagram as a function of intrinsic and effective spin-dependent interaction strengths. Our result demonstrates that closed-loop quantum control of Bose-Einstein condensates is a powerful tool for quantum engineering in cold-atom systems.}, doi = {10.1103/PhysRevResearch.2.043325}, author = {Hurst, Hilary M. and Guo, Shangjie and Spielman, I. B.} } @article { ISI:000559739800002, title = {Feshbach Resonances in p-Wave Three-Body Recombination within Fermi-Fermi Mixtures of Open-Shell Li-6 and Closed-Shell Yb-173 Atoms}, journal = {Phys. Rev. X}, volume = {10}, number = {3}, year = {2020}, month = {AUG 14}, pages = {031037}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We report on the observation of magnetic Feshbach resonances in a Fermi-Fermi mixture of ultracold atoms with extreme mass imbalance and on their unique p-wave dominated three-body recombination processes. Our systemconsists of open-shell alkali-metal Li-6 and closed-shell Yb-173 atoms, both spin polarized and held at various temperatures between 1 and 20 mu K. We confirmthat Feshbach resonances in this systemare solely the result of a weak separation-dependent hyperfine coupling between the electronic spin of Li-6 and the nuclear spin of Yb-173. Our analysis also shows that three-body recombination rates are controlled by the identical fermion nature of the mixture, even in the presence of s-wave collisions between the two species and with recombination rate coefficients outside the Wigner threshold regime at our lowest temperature. Specifically, a comparison of experimental and theoretical line shapes of the recombination process indicates that the characteristic asymmetric line shape as a function of applied magnetic field and a maximum recombination rate coefficient that is independent of temperature can only be explained by triatomic collisions with nonzero, p-wave total orbital angular momentum. The resonances can be used to form ultracold doublet ground-state molecules and to simulate quantum superfluidity in mass-imbalanced mixtures.}, issn = {2160-3308}, doi = {10.1103/PhysRevX.10.031037}, author = {Green, Alaina and Li, Hui and Toh, Jun Hui See and Tang, Xinxin and McCormick, Katherine C. and Li, Ming and Tiesinga, Eite and Kotochigova, Svetlana and Gupta, Subhadeep} } @article { ISI:000535764500002, title = {Filter-free single-photon quantum dot resonance fluorescence in an integrated cavity-waveguide device}, journal = {Optica}, volume = {7}, number = {5}, year = {2020}, month = {MAY 20}, pages = {380-385}, publisher = {OPTICAL SOC AMER}, type = {Article}, abstract = {Semiconductor quantum dots embedded in micropillar cavities are excellent emitters of single photons when pumped resonantly. Often, the same spatial mode is used to both resonantly excite a quantum-dot state and to collect the emitted single photons, requiring cross polarization to reduce the uncoupled scattered laser light. This inherently reduces the source brightness to 50\%. Critically, for some quantum applications the total efficiency from generation to detection must be over 50\%. Here, we demonstrate a resonant-excitation approach to creating single photons that is free of any cross polarization, and in fact any filtering whatsoever. It potentially increases single-photon rates and collection efficiencies, and simplifies operation. This integrated device allows us to resonantly excite single quantum-dot states in several cavities in the plane of the device using connected waveguides, while the cavity-enhanced single-photon fluorescence is directed vertically (off-chip) in a Gaussian mode. We expect this design to be a prototype for larger chip-scale quantum photonics. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement}, issn = {2334-2536}, doi = {10.1364/OPTICA.382273}, author = {Huber, Tobias and Davanco, Marcelo and Muller, Markus and Shuai, Yichen and Gazzano, Olivier and Solomon, Glenn S.} } @article { ISI:000551007800002, title = {Fluctuations in Extractable Work Bound the Charging Power of Quantum Batteries}, journal = {Phys. Rev. Lett.}, volume = {125}, number = {4}, year = {2020}, month = {JUL 22}, pages = {040601}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We study the connection between the charging power of quantum batteries and the fluctuations of the extractable work. We prove that in order to have a nonzero rate of change of the extractable work, the state rho(W) of the battery cannot be an eigenstatc of a {\textquoteleft}{\textquoteleft}free energy operator,{{\textquoteright}{\textquoteright}} defined by F H-W + beta(-1) log(rho(W)), where H-W is the Hamiltonian of the battery and beta is the inverse temperature of a reference thermal bath with respect to which the extractable work is calculated. We do so by proving that fluctuations in the free energy operator upper bound the charging power of a quantum battery. Our findings also suggest that quantum coherence in the battery enhances the charging process, which we illustrate on a toy model of a heat engine.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.125.040601}, author = {Pedro Garcia-Pintos, Luis and Hamma, Alioscia and del Campo, Adolfo} } @article {tenasini_giant_2020, title = {Giant anomalous {Hall} effect in quasi-two-dimensional layered antiferromagnet {Co1}/{3NbS2}}, journal = {Phys. Rev. Res.}, volume = {2}, number = {2}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {apr}, abstract = {The discovery of the anomalous Hall effect (AHE) in bulk metallic antiferromagnets (AFMs) motivates the search of the same phenomenon in two-dimensional (2D) systems, where a quantized anomalous Hall conductance can, in principle, be observed. Here we present experiments on microfabricated devices based on Co1/3NbS2, a layered AFM that was recently found to exhibit AHE in bulk crystals below the Neel temperature T-N = 29 K. Transport measurements reveal a pronounced resistivity anisotropy, indicating that upon lowering temperature the electronic coupling between individual atomic layers is increasingly suppressed. The experiments also show an extremely large anomalous Hall conductivity of approximately 400 S/cm, more than one order of magnitude larger than in the bulk, which demonstrates the importance of studying the AHE in small exfoliated crystals, less affected by crystalline defects. Interestingly, the corresponding anomalous Hall conductance, when normalized to the number of contributing atomic planes, is similar to 0.6 e(2)/h per layer, approaching the value expected for the quantized anomalous Hall effect. The observed strong anisotropy of transport and the very large anomalous Hall conductance per layer make the properties of Co1/3NbS2 compatible with the presence of partially filled topologically nontrivial 2D bands originating from the magnetic superstructure of the antiferromagnetic state. Isolating atomically thin layers of this material and controlling their charge density may therefore provide a viable route to reveal the occurrence of the quantized AHE in a 2D AFM.

}, doi = {10.1103/PhysRevResearch.2.023051}, author = {Tenasini, Giulia and Martino, Edoardo and Ubrig, Nicolas and Ghimire, Nirmal J. and Berger, Helmuth and Zaharko, Oksana and Wu, Fengcheng and Mitchell, J. F. and Martin, Ivar and Forro, Laszlo and Morpurgo, Alberto F.} } @article {16891, title = {Hierarchy of Linear Light Cones with Long-Range Interactions}, journal = {Phys. Rev. X}, volume = {10}, year = {2020}, month = {Jul}, pages = {031009}, doi = {10.1103/PhysRevX.10.031009}, url = {https://link.aps.org/doi/10.1103/PhysRevX.10.031009}, author = {Tran, Minh C. and Chen, Chi-Fang and Ehrenberg, Adam and Guo, Andrew Y. and Deshpande, Abhinav and Hong, Yifan and Gong, Zhe-Xuan and Gorshkov, Alexey V. and Lucas, Andrew} } @conference {rao_integrated_2020, title = {Integrated {Photonic} {Interposers} for {Processing} {Octave}-{Spanning} {Microresonator} {Frequency} {Combs}}, booktitle = {Conference on Lasers and Electro-Optics (CLEO)}, series = {Conference on {Lasers} and {Electro}-{Optics}}, year = {2020}, note = {Backup Publisher: IEEE ISSN: 2160-9020 Type: Proceedings Paper}, publisher = {IEEE}, organization = {IEEE}, abstract = {We demonstrate multiple silicon-nitride nanophotonic elements for on-chip processing of octave-spanning microresonator frequency combs. Dichroic filters, multimode interferometers, and tunable add-drop microring filters are shown along with soliton microcombs generated on a bilayer photonic chip. (C) 2020 The Author(s)

}, isbn = {978-1-943580-76-7}, author = {Rao, Ashutosh and Moille, Gregory and Lu, Xiyuan and Sacchetto, Davide and Geiselmann, Michael and Zervas, Michael and Papp, Scott and Bowers, John and Srinivasan, Kartik} } @conference {dutta_integrated_2020, title = {An {Integrated} {Photonic} {Platform} for {Rare}-{Earth} {Ions} in {Thin} {Film} {Lithium} {Niobate}}, booktitle = {Conference on Lasers and Electro-Optics (CLEO)}, series = {Conference on {Lasers} and {Electro}-{Optics}}, year = {2020}, note = {Backup Publisher: IEEE ISSN: 2160-9020 Type: Proceedings Paper}, publisher = {IEEE}, organization = {IEEE}, abstract = {We demonstrate an integrated photonic platform for rare earth ions in thin film lithium niobate. The ions in the thin film retain bulk like optical properties. This paves way for a new generation of highly scalable, active optoelectronic devices with applications to both classical and quantum optics. (C) 2020 The Author(s)

}, isbn = {978-1-943580-76-7}, author = {Dutta, Subhojit and Goldschmidt, Elizabeth A. and Barik, Sabyasachi and Saha, Uday and Waks, Edo} } @article { ISI:000507151600097, title = {Integrated Photonic Platform for Rare-Earth Ions in Thin Film Lithium Niobate}, journal = {Nano Lett.}, volume = {20}, number = {1}, year = {2020}, month = {JAN}, pages = {741-747}, publisher = {AMER CHEMICAL SOC}, type = {Article}, abstract = {Rare-earth ion ensembles doped in single crystals are a promising materials system with widespread applications in optical signal processing, lasing, and quantum information processing. Incorporating rare-earth ions into integrated photonic devices could enable compact lasers and modulators, as well as on-chip optical quantum memories for classical and quantum optical applications. To this end, a thin film single crystalline wafer structure that is compatible with planar fabrication of integrated photonic devices would be highly desirable. However, incorporating rare-earth ions into a thin film form-factor while preserving their optical properties has proven challenging. We demonstrate an integrated photonic platform for rare-earth ions doped in a single crystalline thin film lithium niobate on insulator. The thin film is composed of lithium niobate doped with Tm3+. The ions in the thin film exhibit optical lifetimes identical to those measured in bulk crystals. We show narrow spectral holes in a thin film waveguide that require up to 2 orders of magnitude lower power to generate than previously reported bulk waveguides. Our results pave the way for scalable on-chip lasers, optical signal processing devices, and integrated optical quantum memories.}, keywords = {integrated photonics, optical signal processing, Rare-earth ions, spectral hole burning quantum information processing, thin film lithium niobate}, issn = {1530-6984}, doi = {10.1021/acs.nanolett.9b04679}, author = {Dutta, Subhojit and Goldschmidt, Elizabeth A. and Barik, Sabyasachi and Saha, Uday and Waks, Edo} } @article { ISI:000570982600002, title = {Many-Body Dephasing in a Trapped-Ion Quantum Simulator}, journal = {Phys. Rev. Lett.}, volume = {125}, number = {12}, year = {2020}, month = {SEP 18}, pages = {120605}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {How a closed interacting quantum many-body system relaxes and dephases as a function of time is a fundamental question in thermodynamic and statistical physics. In this Letter, we analyze and observe the persistent temporal fluctuations after a quantum quench of a tunable long-range interacting transverse-field Ising Hamiltonian realized with a trapped-ion quantum simulator. We measure the temporal fluctuations in the average magnetization of a finite-size system of spin-1/2 particles. We experiment in a regime where the properties of the system are closely related to the integrable Hamiltonian with global spin-spin coupling, which enables analytical predictions for the long-time nonintegrable dynamics. The analytical expression for the temporal fluctuations predicts the exponential suppression of temporal fluctuations with increasing system size. Our measurement data is consistent with our theory predicting the regime of many-body dephasing.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.125.120605}, author = {Kaplan, Harvey B. and Guo, Lingzhen and Tan, Wen Lin and De, Arinjoy and Marquardt, Florian and Pagano, Guido and Monroe, Christopher} } @article {16686, title = {Many-Body Dynamical Localization in a Kicked Lieb-Liniger Gas}, journal = {Phys. Rev. Lett.}, volume = {124}, year = {2020}, month = {04/2020}, pages = {155302}, abstract = {The kicked rotor system is a textbook example of how classical and quantum dynamics can drastically differ. The energy of a classical particle confined to a ring and kicked periodically will increase linearly in time whereas in the quantum version the energy saturates after a finite number of kicks. The quantum system undergoes Anderson localization in angular-momentum space. Conventional wisdom says that in a many-particle system with short-range interactions the localization will be destroyed due to the coupling of widely separated momentum states. Here we provide evidence that for an interacting one-dimensional Bose gas, the Lieb-Liniger model, the dynamical localization can persist at least for an unexpectedly long time.

}, keywords = {Quantum Physics, Thermodynamics}, doi = {10.1103/PhysRevLett.124.155302}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.124.155302}, author = {Rylands, Colin and Rozenbaum, Efim B. and Galitski, Victor and Konik, Robert} } @article {19051, title = {Many-Body Level Statistics of Single-Particle Quantum Chaos}, journal = {Phys. Rev. Lett.}, volume = {125}, year = {2020}, month = {Dec}, pages = {250601}, doi = {10.1103/PhysRevLett.125.250601}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.125.250601}, author = {Liao, Yunxiang and Vikram, Amit and Galitski, Victor} } @article { ISI:000505981500001, title = {Many-body localization landscape}, journal = {Phys. Rev. B}, volume = {101}, number = {1}, year = {2020}, month = {JAN 6}, pages = {014201}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We generalize the notion of {\textquoteleft}{\textquoteleft}localization landscape,{{\textquoteright}{\textquoteright}} introduced by M. Filoche and S. Mayboroda {[}Proc. Natl. Acad. Sci. USA 109, 14761 (2012)] for the single-particle Schrodinger operator, to a wide class of interacting many-body Hamiltonians. The many-body localization landscape (MBLL) is defined on a graph in the Fock space, whose nodes represent the basis vectors in the Fock space and edges correspond to transitions between the nodes connected by the hopping term in the Hamiltonian. It is shown that in analogy to the single-particle case, the inverse MBLL plays the role of an effective potential in the Fock space. We construct a generalized discrete Agmon metric and prove Agmon inequalities on the Fock-state graph to obtain bounds on the exponential decay of the many-body wave functions in the Fock space. The corresponding construction is motivated by the semiclassical WKB approximation, but the bounds are exact and fully quantum mechanical. We then prove a series of locality theorems which establish where in the Fock space we expect eigenstates to localize. Using these results as well as the locator expansion, we establish evidence for the existence of many-body localized states for a wide class of lattice models in any physical dimension in at least a part of their Hilbert space. The key to this argument is the observation that in sharp contrast to the conventional locator expansion for the Green{\textquoteright}s function, the locator expansion for the landscape function contains no resonances. For short-range hopping, which limits the connectivity of the Fock-state graph, the locator series is proven to be convergent and bounded by a simple geometric series. This, in combination with the discrete Agmon-type inequalities and the locality theorems, shows that localization for a fraction of the Hilbert space survives weak interactions and weak hopping at least for some realizations of disorder, but cannot prove or rule out localization of the entire Hilbert space. We qualitatively discuss potential breakdown of the locator expansion in the MBLL for long-range hopping and the appearance of a mobility edge in higher-dimensional theories.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.101.014201}, author = {Balasubramanian, Shankar and Liao, Yunxiang and Galitski, Victor} } @article {sinha_non-markovian_2020, title = {Non-{Markovian} {Collective} {Emission} from {Macroscopically} {Separated} {Emitters}}, journal = {Phys. Rev. Lett.}, volume = {124}, number = {4}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {jan}, abstract = {We study the collective radiative decay of a system of two two-level emitters coupled to a one-dimensional waveguide in a regime where their separation is comparable to the coherence length of a spontaneously emitted photon. The electromagnetic field propagating in the cavity-like geometry formed by the emitters exerts a retarded backaction on the system leading to strongly non-Markovian dynamics. The collective spontaneous emission rate of the emitters exhibits an enhancement or inhibition beyond the usual Dicke superradiance and subradiance due to self-consistent coherent time-delayed feedback.

}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.124.043603}, author = {Sinha, Kanupriya and Meystre, Pierre and Goldschmidt, Elizabeth A. and Fatemi, Fredrik K. and Rolston, S. L. and Solano, Pablo} } @article { ISI:000515062100001, title = {Nonequilibrium Fixed Points of Coupled Ising Models}, journal = {Phys. Rev. X}, volume = {10}, number = {1}, year = {2020}, month = {FEB 19}, pages = {011039}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Driven-dissipative systems are expected to give rise to nonequilibrium phenomena that are absent in their equilibrium counterparts. However, phase transitions in these systems generically exhibit an effectively classical equilibrium behavior in spite of their nonequilibrium origin. In this paper, we show that multicritical points in such systems lead to a rich and genuinely nonequilibrium behavior. Specifically, we investigate a driven-dissipative model of interacting bosons that possesses two distinct phase transitions: one from a high- to a low-density phase-reminiscent of a liquid-gas transition-and another to an antiferromagnetic phase. Each phase transition is described by the Ising universality class characterized by an (emergent or microscopic) Z(2) symmetry. However, they coalesce at a multicritical point, giving rise to a nonequilibrium model of coupled Ising-like order parameters described by a Z(2) x Z(2) symmetry. Using a dynamical renormalization-group approach, we show that a pair of nonequilibrium fixed points (NEFPs) emerge that govern the long-distance critical behavior of the system. We elucidate various exotic features of these NEFPs. In particular, we show that a generic continuous scale invariance at criticality is reduced to a discrete scale invariance. This further results in complex-valued critical exponents and spiraling phase boundaries, and it is also accompanied by a complex Liouvillian gap even close to the phase transition. As direct evidence of the nonequilibrium nature of the NEFPs, we show that the fluctuation-dissipation relation is violated at all scales, leading to an effective temperature that becomes {\textquoteleft}{\textquoteleft}hotter{{\textquoteright}{\textquoteright}} and {\textquoteleft}{\textquoteleft}hotter{{\textquoteright}{\textquoteright}} at longer and longer wavelengths. Finally, we argue that this nonequilibrium behavior can be observed in cavity arrays with cross-Kerr nonlinearities.}, keywords = {Photonics, Quantum Physics, Statistical Physics}, issn = {2160-3308}, doi = {10.1103/PhysRevX.10.011039}, author = {Young, Jeremy T. and Gorshkov, Alexey V. and Foss-Feig, Michael and Maghrebi, Mohammad F.} } @article { ISI:000510393100010, title = {Non-Markovian Collective Emission from Macroscopically Separated Emitters}, journal = {Phys. Rev. Lett.}, volume = {124}, number = {4}, year = {2020}, month = {JAN 31}, pages = {043603}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We study the collective radiative decay of a system of two two-level emitters coupled to a one-dimensional waveguide in a regime where their separation is comparable to the coherence length of a spontaneously emitted photon. The electromagnetic field propagating in the cavity-like geometry formed by the emitters exerts a retarded backaction on the system leading to strongly non-Markovian dynamics. The collective spontaneous emission rate of the emitters exhibits an enhancement or inhibition beyond the usual Dicke superradiance and subradiance due to self-consistent coherent time-delayed feedback.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.124.043603}, author = {Sinha, Kanupriya and Meystre, Pierre and Goldschmidt, Elizabeth A. and Fatemi, Fredrik K. and Rolston, S. L. and Solano, Pablo} } @article { ISI:000524978500001, title = {Number-Theoretic Characterizations of Some Restricted Clifford}, journal = {Quantum}, volume = {4}, year = {2020}, month = {APR 3}, publisher = {VEREIN FORDERUNG OPEN ACCESS PUBLIZIERENS QUANTENWISSENSCHAF}, type = {Article}, abstract = {Kliuchnikov, Maslov, and Mosca proved in 2012 that a 2 x 2 unitary matrix V can be exactly represented by a single-qubit Clifford + T circuit if and only if the entries of V belong to the ring Z{[}1/root 2, i]. Later that year, Giles and Selinger showed that the same restriction applies to matrices that can be exactly represented by a multi-qubit Clifford + T circuit. These number-theoretic characterizations shed new light upon the structure of Clifford + T circuits and led to remarkable developments in the field of quantum compiling. In the present paper, we provide number-theoretic characterizations for certain restricted Clifford + T circuits by considering unitary matrices over subrings of Z{[}1/root 2, i]. We focus on the subrings Z{[}1./2], Z{[}1/root 2], Z{[}1/i root 2], and Z{[}1/2, i], and we prove that unitary matrices with entries in these rings correspond to circuits over well-known universal gate sets. In each case, the desired gate set is obtained by extending the set of classical reversible gates \{X, CX, CCX\} with an analogue of the Hadarnard gate and an optional phase gate.}, issn = {2521-327X}, author = {Amy, Matthew and Glaudell, Andrew N. and Ross, Neil J.} } @article { ISI:000550690300003, title = {On-demand indistinguishable single photons from an efficient and pure source based on a Rydberg ensemble}, journal = {Optica}, volume = {7}, number = {7}, year = {2020}, month = {JUL 20}, pages = {813-819}, publisher = {OPTICAL SOC AMER}, type = {Article}, abstract = {Single photons coupled to atomic systems have shown to be a promising platform for developing quantum technologies. Yet a bright on-demand, highly pure, and highly indistinguishable single-photon source compatible with atomic platforms is lacking. In this work, we demonstrate such a source based on a strongly interacting Rydberg system. The large optical nonlinearities in a blockaded Rydberg ensemble convert coherent light into a single collective excitation that can be coherently retrieved as a quantum field. We simultaneously observe a fully single-mode (spectral, temporal, spatial, and polarization) efficiency up to 0.098(2), a detector-background-subtracted g((2))+5.0(1.6) x 10(-4), and indistinguishability of 0.980(7), at an average photon production rate of 1.18(2) x 10(4) s(-1), All of these make this system promising for scalable quantum information applications. Furthermore, we investigate the effects of contaminant Rydberg excitations on the source efficiency and observed single-mode efficiencies up to 0.18(2) for lower photon rates. Finally, recognizing that many quantum information protocols require a single photon in a fully single mode, we introduce metrics that take into account all degrees of freedom to benchmark the performance of on-demand sources. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement}, issn = {2334-2536}, doi = {10.1364/OPTICA.391485}, author = {Ornelas-Huerta, D. P. and Craddock, A. N. and Goldschmidt, E. A. and Hachtel, A. J. and Wang, Y. and Bienias, P. and Gorshkov, A. V. and Rolston, S. L. and Porto, J. V.} } @article {ge_operational_2020, title = {Operational resource theory of nonclassicality via quantum metrology}, journal = {Phys. Rev. Res.}, volume = {2}, number = {2}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, abstract = {The nonclassical properties of quantum states are of tremendous interest due to their potential applications in future technologies. It has recently been realized that the concept of a resource theory is a powerful approach to quantifying and understanding nonclassicality. To realize the potential of this approach, one must first find resource theoretic measures of nonclassicality that are operational, meaning that they also quantify the ability of quantum states to provide enhanced performance for specific tasks, such as precision sensing. Here we achieve a significant milestone in this endeavor by presenting such an operational resource theoretic measure. In addition to satisfying the requirements of a resource measure, it has the closest possible relationship to the quantum enhancement provided by a nonclassical state for measuring phase-space displacement: It is equal to this enhancement for pure states and has a tight upper bound on it for mixed states. We also show that a lower bound on this measure can be obtained experimentally using a simple Mach-Zehnder interferometer.}, doi = {10.1103/PhysRevResearch.2.023400}, author = {Ge, Wenchao and Jacobs, Kurt and Asiri, Saeed and Foss-Feig, Michael and Zubairy, M. Suhail} } @article { ISI:000530031700002, title = {Operator Levy Flight: Light Cones in Chaotic Long-Range Interacting Systems}, journal = {Phys. Rev. Lett.}, volume = {124}, number = {18}, year = {2020}, month = {MAY 4}, pages = {180601}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We argue that chaotic power-law interacting systems have emergent limits on information propagation, analogous to relativistic light cones, which depend on the spatial dimension d and the exponent a governing the decay of interactions. Using the dephasing nature of quantum chaos, we map the problem to a stochastic model with a known phase diagram. A linear light cone results for alpha >= d + 1/2. We also provide a Levy flight (long-range random walk) interpretation of the results and show consistent numerical data for 1D long-range spin models with 200 sites.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.124.180601}, author = {Zhou, Tianci and Xu, Shenglong and Chen, Xiao and Guo, Andrew and Swingle, Brian} } @article { ISI:000538714300009, title = {Optical enhancement of superconductivity via targeted destruction of charge density waves}, journal = {Phys. Rev. B}, volume = {101}, number = {22}, year = {2020}, month = {JUN 8}, pages = {224506}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {It has been experimentally established that the occurrence of charge density waves is a common feature of various underdoped cuprate superconducting compounds. The observed states, which are often found in the form of bond density waves (BDWs), usually occur in a temperature regime immediately above the superconducting transition temperature. Motivated by recent optical experiments on superconducting materials, where it has been shown that optical irradiation can transiently improve the superconducting features, here we propose an approach for the enhancement of superconductivity by the targeted destruction of the BDW order which we expect to be more efficient than the previous methods. Since BDW states are usually found in competition with superconductivity, suppression of the BDW order enhances the tendency of electrons to form Cooper pairs after reaching a steady state. By investigating the optical coupling of gapless, collective fluctuations of the BDW modes, we argue that the resonant excitation of these modes can melt the underlying BDW order parameter. We propose an experimental setup to implement such an optical coupling using two-dimensional plasmon-polariton hybrid systems.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.101.224506}, author = {Dehghani, Hossein and Raines, Zachary M. and Galitski, Victor M. and Hafezi, Mohammad} } @article { ISI:000527498000001, title = {Optical excitations in compressible and incompressible two-dimensional electron liquids}, journal = {Phys. Rev. B}, volume = {101}, number = {15}, year = {2020}, month = {APR 22}, pages = {155127}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Optically generated electron-hole pairs can probe strongly correlated electronic matter, or, by forming exciton-polaritons within an optical cavity, give rise to photonic nonlinearities. The present paper theoretically studies the properties of electron-hole pairs in a two-dimensional electron liquid in the fractional quantum Hall regime. In particular, we quantify the effective interactions between optical excitations by numerically evaluating the system{\textquoteright}s energy spectrum under the assumption of full spin and Landau level polarization. Optically most active are those pair excitations which do not modify the correlations of the electron liquid, also known as multiplicative states. In the case of spatial separation of electrons and holes, these excitations interact repulsively with each other. However, when the electron liquid is compressible, other nonmultiplicative configurations occur at lower energies. The interactions of such dark excitations strongly depend on the liquid, and can also become attractive. For the case of a single excitation, we also study the effect of Landau level mixing in the valence band which can dramatically change the effective mass of an exciton.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.101.155127}, author = {Grass, Tobias and Cotlet, Ovidiu and Imamoglu, Atac and Hafezi, Mohammad} } @article {rylands_photon-mediated_2020, title = {Photon-{Mediated} {Peierls} {Transition} of a {1D} {Gas} in a {Multimode} {Optical} {Cavity}}, journal = {Phys. Rev. Lett.}, volume = {125}, number = {1}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {jul}, abstract = {The Peierls instability toward a charge density wave is a canonical example of phonon-driven strongly correlated physics and is intimately related to topological quantum matter and exotic superconductivity. We propose a method for realizing an analogous photon-mediated Peierls transition, using a system of one-dimensional tubes of interacting Bose or Fermi atoms trapped inside a multimode confocal cavity. Pumping the cavity transversely engineers a cavity-mediated metal-to-insulator transition in the atomic system. For strongly interacting bosons in the Tonks-Girardeau limit, this transition can be understood (through fermionization) as being the Peierls instability. We extend the calculation to finite values of the interaction strength and derive analytic expressions for both the cavity field and mass gap. They display nontrivial power law dependence on the dimensionless matter-light coupling.

}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.125.010404}, author = {Rylands, Colin and Guo, Yudan and Lev, Benjamin L. and Keeling, Jonathan and Galitski, Victor} } @article {16931, title = {Photon propagation through dissipative Rydberg media at large input rates}, journal = {Phys. Rev. Research}, volume = {2}, year = {2020}, month = {Jul}, pages = {033049}, abstract = {We study the dissipative propagation of quantized light in interacting Rydberg media under the conditions of electromagnetically induced transparency. Rydberg blockade physics in optically dense atomic media leads to strong dissipative interactions between single photons. The regime of high incoming photon flux constitutes a challenging many-body dissipative problem. We experimentally study in detail the pulse shapes and the second-order correlation function of the outgoing field and compare our data with simulations based on two novel theoretical approaches well-suited to treat this many-photon limit. At low incoming flux, we report good agreement between both theories and the experiment. For higher input flux, the intensity of the outgoing light is lower than that obtained from theoretical predictions. We explain this discrepancy using a simple phenomenological model taking into account pollutants, which are nearly stationary Rydberg excitations coming from the reabsorption of scattered probe photons. At high incoming photon rates, the blockade physics results in unconventional shapes of measured correlation functions.

}, keywords = {Models, Photonics}, doi = {10.1103/PhysRevResearch.2.033049}, url = {https://link.aps.org/doi/10.1103/PhysRevResearch.2.033049}, author = {Bienias, Przemyslaw and Douglas, James and Paris-Mandoki, Asaf and Titum, Paraj and Mirgorodskiy, Ivan and Tresp, Christoph and Zeuthen, Emil and Gullans, Michael J. and Manzoni, Marco and Hofferberth, Sebastian and Chang, Darrick and Gorshkov, Alexey V.} } @article {16911, title = {Photon-Mediated Peierls Transition of a 1D Gas in a Multimode Optical Cavity}, journal = {Phys. Rev. Lett.}, volume = {125}, year = {2020}, month = {Jul}, pages = {010404}, abstract = {The Peierls instability toward a charge density wave is a canonical example of phonon-driven strongly correlated physics and is intimately related to topological quantum matter and exotic superconductivity. We propose a method for realizing an analogous photon-mediated Peierls transition, using a system of one-dimensional tubes of interacting Bose or Fermi atoms trapped inside a multimode confocal cavity. Pumping the cavity transversely engineers a cavity-mediated metal-to-insulator transition in the atomic system. For strongly interacting bosons in the Tonks-Girardeau limit, this transition can be understood (through fermionization) as being the Peierls instability. We extend the calculation to finite values of the interaction strength and derive analytic expressions for both the cavity field and mass gap. They display nontrivial power law dependence on the dimensionless matter-light coupling.

}, doi = {10.1103/PhysRevLett.125.010404}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.125.010404}, author = {Rylands, Colin and Guo, Yudan and Lev, Benjamin L. and Keeling, Jonathan and Galitski, Victor} } @article {17151, title = {Proposal for gravitational direct detection of dark matter}, journal = {Phys. Rev. D}, volume = {102}, year = {2020}, month = {Oct}, pages = {072003}, doi = {10.1103/PhysRevD.102.072003}, url = {https://link.aps.org/doi/10.1103/PhysRevD.102.072003}, author = {Carney, Daniel and Ghosh, Sohitri and Krnjaic, Gordan and Taylor, Jacob M.} } @article {17096, title = {Quantum simulation of hyperbolic space with circuit quantum electrodynamics: From graphs to geometry}, journal = {Phys. Rev. A}, volume = {102}, year = {2020}, month = {Sep}, pages = {032208}, abstract = {We show how quantum many-body systems on hyperbolic lattices with nearest-neighbor hopping and local interactions can be mapped onto quantum field theories in continuous negatively curved space. The underlying lattices have recently been realized experimentally with superconducting resonators and therefore allow for a table-top quantum simulation of quantum physics in curved background. Our mapping provides a computational tool to determine observables of the discrete system even for large lattices, where exact diagonalization fails. As an application and proof of principle we quantitatively reproduce the ground state energy, spectral gap, and correlation functions of the noninteracting lattice system by means of analytic formulas on the Poincar{\'e} disk, and show how conformal symmetry emerges for large lattices. This sets the stage for studying interactions and disorder on hyperbolic graphs in the future. Importantly, our analysis reveals that even relatively small discrete hyperbolic lattices emulate the continuous geometry of negatively curved space, and thus can be used to experimentally resolve fundamental open problems at the interface of interacting many-body systems, quantum field theory in curved space, and quantum gravity.

}, keywords = {hyperbolic geometry, quantum simulation}, doi = {10.1103/PhysRevA.102.032208}, url = {https://link.aps.org/doi/10.1103/PhysRevA.102.032208}, author = {Boettcher, Igor and Bienias, Przemyslaw and Belyansky, Ron and Kollar, Alicia J. and Gorshkov, Alexey V.} } @article {caravelli_random_2020, title = {Random quantum batteries}, journal = {Phys. Rev. Res.}, volume = {2}, number = {2}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {apr}, abstract = {Quantum nanodevices are fundamental systems in quantum thermodynamics that have been the subject of profound interest in recent years. Among these, quantum batteries play a very important role. In this paper we lay down a theory of random quantum batteries and provide a systematic way of computing the average work and work fluctuations in such devices by investigating their typical behavior. We show that the performance of random quantum batteries exhibits typicality and depends only on the spectral properties of the time evolving operator, the initial state, and the measuring Hamiltonian. At given revival times a random quantum battery features a quantum advantage over classical random batteries. Our method is particularly apt to be used both for exactly solvable models like the Jaynes-Cummings model or in perturbation theory, e.g., systems subject to harmonic perturbations. We also study the setting of quantum adiabatic random batteries.}, doi = {10.1103/PhysRevResearch.2.023095}, author = {Caravelli, Francesco and Coulter-De Wit, Ghislaine and Pedro Garcia-Pintos, Luis and Hamma, Alioscia} } @article { ISI:000548153300005, title = {Signaling and scrambling with strongly long-range interactions}, journal = {Phys. Rev. A}, volume = {102}, number = {1}, year = {2020}, month = {JUL 8}, pages = {010401}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Strongly long-range interacting quantum systems-those with interactions decaying as a power law 1/r(alpha) in the distance r on a D-dimensional lattice for alpha <= D-have received significant interest in recent years. They are present in leading experimental platforms for quantum computation and simulation, as well as in theoretical models of quantum-information scrambling and fast entanglement creation. Since no notion of locality is expected in such systems, a general understanding of their dynamics is lacking. In a step towards rectifying this problem, we prove two Lieb-Robinson-type bounds that constrain the time for signaling and scrambling in strongly long-range interacting systems, for which no tight bounds were previously known. Our first bound applies to systems mappable to free-particle Hamiltonians with long-range hopping, and is saturable for alpha <= D/2. Our second bound pertains to generic long-range interacting spin Hamiltonians and gives a tight lower bound for the signaling time to extensive subsets of the system for all alpha < D. This many-site signaling time lower bounds the scrambling time in strongly long-range interacting systems.}, issn = {1050-2947}, doi = {10.1103/PhysRevA.102.010401}, author = {Guo, Andrew Y. and Tran, Minh C. and Childs, Andrew M. and Gorshkov, V, Alexey and Gong, Zhe-Xuan} } @article {19026, title = {Symmetry Breaking and Error Correction in Open Quantum Systems}, journal = {Phys. Rev. Lett.}, volume = {125}, year = {2020}, month = {Dec}, pages = {240405}, abstract = {Symmetry-breaking transitions are a well-understood phenomenon of closed quantum systems in quantum optics, condensed matter, and high energy physics. However, symmetry breaking in open systems is less thoroughly understood, in part due to the richer steady-state and symmetry structure that such systems possess. For the prototypical open system{\textemdash}a Lindbladian{\textemdash}a unitary symmetry can be imposed in a {\textquotedblleft}weak{\textquotedblright} or a {\textquotedblleft}strong{\textquotedblright} way. We characterize the possible\ Zn\ symmetry-breaking transitions for both cases. In the case of\ Z2, a weak-symmetry-broken phase guarantees at most a classical bit steady-state structure, while a strong-symmetry-broken phase admits a partially protected steady-state qubit. Viewing photonic cat qubits through the lens of strong-symmetry breaking, we show how to dynamically recover the logical information after any gap-preserving strong-symmetric error; such recovery becomes perfect exponentially quickly in the number of photons. Our study forges a connection between driven-dissipative phase transitions and error correction.

}, doi = {10.1103/PhysRevLett.125.240405}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.125.240405}, author = {Lieu, Simon and Belyansky, Ron and Young, Jeremy T. and Lundgren, Rex and Albert, Victor V. and Gorshkov, Alexey V.} } @article { ISI:000521105100002, title = {Time Evolution of Correlation Functions in Quantum Many-Body Systems}, journal = {Phys. Rev. Lett.}, volume = {124}, number = {11}, year = {2020}, month = {MAR 19}, pages = {110605}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We give rigorous analytical results on the temporal behavior of two-point correlation functions-also known as dynamical response functions or Green{\textquoteright}s functions-in closed many-body quantum systems. We show that in a large class of translation-invariant models the correlation functions factorize at late times \< A(t)B \>(beta) -\> \< A \>(beta) \< B \>(beta) , thus proving that dissipation emerges out of the unitary dynamics of the system. We also show that for systems with a generic spectrum the fluctuations around this late-time value are bounded by the purity of the thermal ensemble, which generally decays exponentially with system size. For autocorrelation functions we provide an upper bound on the timescale at which they reach the factorized late time value. Remarkably, this bound is only a function of local expectation values and does not increase with system size. We give numerical examples that show that this bound is a good estimate in nonintegrable models, and argue that the timescale that appears can be understood in terms of an emergent fluctuationdissipation theorem. Our study extends to further classes of two point functions such as the symmetrized ones and the Kubo function that appears in linear response theory, for which we give analogous results.

}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.124.110605}, author = {Alhambra, Alvaro M. and Riddell, Jonathon and Garcia-Pintos, Luis Pedro} } @article {nicholson_time-information_2020, title = {Time-information uncertainty relations in thermodynamics}, journal = {Nat. Phys.}, volume = {16}, number = {12}, year = {2020}, note = {Place: HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY Publisher: NATURE RESEARCH Type: Article}, month = {dec}, abstract = {Physical systems powering motion and creating structure in a fixed amount of time dissipate energy and produce entropy. Whether living, synthetic or engineered, systems performing these dynamic functions must balance dissipation and speed. Here, we show that rates of energy and entropy exchange are subject to a speed limit-a time-information uncertainty relation-imposed by the rates of change in the information content of the system. This uncertainty relation bounds the time that elapses before the change in a thermodynamic quantity has the same magnitude as its s.d. From this general bound, we establish a family of speed limits for heat, dissipated/chemical work and entropy depending on the experimental constraints on the system and its environment. In all of these inequalities, the timescale of transient dynamical fluctuations is universally bounded by the Fisher information. Moreover, they all have a mathematical form that mirrors the Mandelstam-Tamm version of the time-energy uncertainty relation in quantum mechanics. These bounds on the speed of arbitrary observables apply to transient systems away from thermodynamic equilibrium, independent of the physical constraints on the stochastic dynamics or their function. A time-information uncertainty relation in thermodynamics has been derived, analogous to the time-energy uncertainty relation in quantum mechanics, imposing limits on the speed of energy and entropy exchange between a system and external reservoirs.}, issn = {1745-2473}, doi = {10.1038/s41567-020-0981-y}, author = {Nicholson, Schuyler B. and Garcia-Pintos, Luis Pedro and del Campo, Adolfo and Green, Jason R.} } @article {zhang_twist-angle_2020, title = {Twist-angle dependence of moire excitons in {WS2}/{MoSe2} heterobilayers}, journal = {Nat. Commun.}, volume = {11}, number = {1}, year = {2020}, note = {Place: HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY Publisher: NATURE RESEARCH Type: Article}, month = {nov}, abstract = {Moire lattices formed in twisted van der Waals bilayers provide a unique, tunable platform to realize coupled electron or exciton lattices unavailable before. While twist angle between the bilayer has been shown to be a critical parameter in engineering the moire potential and enabling novel phenomena in electronic moire systems, a systematic experimental study as a function of twist angle is still missing. Here we show that not only are moire excitons robust in bilayers of even large twist angles, but also properties of the moire excitons are dependant on, and controllable by, the moire reciprocal lattice period via twist-angle tuning. From the twist-angle dependence, we furthermore obtain the effective mass of the interlayer excitons and the electron inter-layer tunneling strength, which are difficult to measure experimentally otherwise. These findings pave the way for understanding and engineering rich moire-lattice induced phenomena in angle-twisted semiconductor van der Waals heterostructures. Here, the authors show that the properties of the moire excitons in twisted van der Waals bilayers of transition metal dichalcogenides are determined by the moire reciprocal lattice period, and can be controlled via twist-angle tuning.}, issn = {2041-1723}, doi = {10.1038/s41467-020-19466-6}, author = {Zhang, Long and Zhang, Zhe and Wu, Fengcheng and Wang, Danqing and Gogna, Rahul and Hou, Shaocong and Watanabe, Kenji and Taniguchi, Takashi and Kulkarni, Krishnamurthy and Kuo, Thomas and Forrest, Stephen R. and Deng, Hui} } @article {13366, title = {Alignment-dependent decay rate of an atomic dipole near an optical nanofiber}, journal = {Phys. Rev. A}, volume = {99}, year = {2019}, month = {Jan}, pages = {013822}, doi = {10.1103/PhysRevA.99.013822}, url = {https://link.aps.org/doi/10.1103/PhysRevA.99.013822}, author = {Solano, P. and Grover, J. A. and Xu, Y. and Barberis-Blostein, P. and Munday, J. N. and Orozco, L. A. and Phillips, W. D. and Rolston, S. L.} } @article {ISI:000457706700026, title = {Anomalous Low-Temperature Enhancement of Supercurrent in Topological-Insulator Nanoribbon Josephson Junctions: Evidence for Low-Energy Andreev Bound States}, journal = {Phys. Rev. Lett.}, volume = {122}, number = {4}, year = {2019}, month = {FEB 1}, pages = {047003}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We report anomalous enhancement of the critical current at low temperatures in gate-tunable Josephson junctions made from topological insulator BiSbTeSe2 nanoribbons with superconducting Nb electrodes. In contrast to conventional junctions, as a function of the decreasing temperature T, the increasing critical current I-c exhibits a sharp upturn at a temperature T-{*} around 20\% of the junction critical temperature for several different samples and various gate voltages. The I-c vs T demonstrates a short junction behavior for T > T-{*}, but crosses over to a long junction behavior for T < T-{*} with an exponential T dependence I-c proportional to exp(-k(B)T/delta), where k(B) is the Boltzmann constant. The extracted characteristic energy scale delta is found to be an order of magnitude smaller than the induced superconducting gap of the junction. We attribute the long-junction behavior with such a small delta to low-energy Andreev bound states arising from winding of the electronic wave function around the circumference of the topological insulator nanoribbon.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.122.047003}, author = {Kayyalha, Morteza and Kargarian, Mehdi and Kazakov, Aleksandr and Miotkowski, Ireneusz and Galitski, Victor M. and Yakovenko, Victor M. and Rokhinson, Leonid P. and Chen, Yong P.} } @article { ISI:000454906800010, title = {Artificial gauge fields with ultracold atoms}, journal = {PHYSICS TODAY}, volume = {72}, number = {1}, year = {2019}, month = {JAN}, pages = {39-44}, issn = {0031-9228}, doi = {10.1063/PT.3.4111}, author = {Galitski, Victor and Juzeliunas, Gediminas and Ian B Spielman} } @article { ISI:000500475200001, title = {Benchmarking an 11-qubit quantum computer}, journal = {Nat. Commun.}, volume = {10}, year = {2019}, month = {NOV 29}, pages = {5464}, publisher = {NATURE PUBLISHING GROUP}, type = {Article}, abstract = {The field of quantum computing has grown from concept to demonstration devices over the past 20 years. Universal quantum computing offers efficiency in approaching problems of scientific and commercial interest, such as factoring large numbers, searching databases, simulating intractable models from quantum physics, and optimizing complex cost functions. Here, we present an 11-qubit fully-connected, programmable quantum computer in a trapped ion system composed of 13 Yb-171(+) ions. We demonstrate average single-qubit gate fidelities of 99.5\%, average two-qubit-gate fidelities of 97.5\%, and SPAM errors of 0.7\%. To illustrate the capabilities of this universal platform and provide a basis for comparison with similarly-sized devices, we compile the Bernstein-Vazirani and Hidden Shift algorithms into our native gates and execute them on the hardware with average success rates of 78\% and 35\%, respectively. These algorithms serve as excellent benchmarks for any type of quantum hardware, and show that our system outperforms all other currently available hardware.}, issn = {2041-1723}, doi = {10.1038/s41467-019-13534-2}, author = {Wright, K. and Beck, K. M. and Debnath, S. and Amini, J. M. and Nam, Y. and Grzesiak, N. and Chen, J. -S. and Pisenti, N. C. and Chmielewski, M. and Collins, C. and Hudek, K. M. and Mizrahi, J. and Wong-Campos, J. D. and Allen, S. and Apisdorf, J. and Solomon, P. and Williams, M. and Ducore, A. M. and Blinov, A. and Kreikemeier, S. M. and Chaplin, V. and Keesan, M. and Monroe, C. and Kim, J.} } @article {ISI:000473123700004, title = {Canonical forms for single-qutrit Clifford plus T operators}, journal = {Ann. Phys.}, volume = {406}, year = {2019}, month = {JUL}, pages = {54-70}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, type = {Article}, abstract = {We introduce canonical forms for single qutrit Clifford+T circuits and prove that every single-qutrit Clifford+T operator admits a unique such canonical form. We show that our canonical forms are T-optimal in the sense that among all the single-qutrit Clifford+T circuits implementing a given operator our canonical form uses the least number of T gates. Finally, we provide an algorithm which inputs the description of an operator (as a matrix or a circuit) and constructs the canonical form for this operator. The algorithm runs in time linear in the number of T gates. Our results provide a higher-dimensional generalization of prior work by Matsumoto and Amano who introduced similar canonical forms for single-qubit Clifford+T circuits. (C) 2019 Elsevier Inc. All rights reserved.}, keywords = {Quantum circuits, quantum computation, Qutrits, Universal gate sets}, issn = {0003-4916}, doi = {10.1016/j.aop.2019.04.001}, author = {Glaudell, Andrew N. and Ross, Neil J. and Taylor, Jacob M.} } @article {ISI:000466441100011, title = {Cavity Quantum Eliashberg Enhancement of Superconductivity}, journal = {Phys. Rev. Lett.}, volume = {122}, number = {16}, year = {2019}, month = {APR 26}, pages = {167002}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Driving a conventional superconductor with an appropriately tuned classical electromagnetic field can lead to an enhancement of superconductivity via a redistribution of the quasiparticles into a more favorable nonequilibrium distribution-a phenomenon known as the Eliashberg effect. Here, we theoretically consider coupling a two-dimensional superconducting film to the quantized electromagnetic modes of a microwave resonator cavity. As in the classical Eliashberg case, we use a kinetic equation to study the effect of the fluctuating, dynamical electromagnetic field on the Bogoliubov quasiparticles. We find that when the photon and quasiparticle systems are out of thermal equilibrium, a redistribution of quasiparticles into a more favorable nonequilibrium steady state occurs, thereby enhancing superconductivity in the sample. We predict that by tailoring the cavity environment (e.g., the photon occupation and spectral functions), enhancement can be observed in a variety of parameter regimes, offering a large degree of tunability.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.122.167002}, author = {Curtis, Jonathan B. and Raines, Zachary M. and Allocca, Andrew A. and Hafezi, Mohammad and Galitski, Victor M.} } @article {ISI:000455821100001, title = {Cavity superconductor-polaritons}, journal = {Phys. Rev. B}, volume = {99}, number = {2}, year = {2019}, month = {JAN 14}, pages = {020504}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Following the recent success of realizing exciton-polariton condensates in cavities, we examine the hybridization of cavity photons with the closest analog of excitons within a superconductor, states called Bardasis-Schrieffer modes. Although these modes do not typically couple linearly to light, one can engineer a coupling with an externally imposed supercurrent, leading to the formation of hybridized Bardasis-Schrieffer-polariton states, which we obtain both as poles of the bosonic Green{\textquoteright}s function and through the derivation of an effective Hamiltonian picture for the model. These new excitations have nontrivial overlap with both the original photon states and d-wave superconducting fluctuations. We conjecture that a phase-coherent density of these objects could produce a finite d-wave component of the superconducting order parameter-an s +/- id superconducting state.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.99.020504}, author = {Allocca, Andrew A. and Raines, Zachary M. and Curtis, Jonathan B. and Galitski, Victor M.} } @article {ISI:000475514100001, title = {Cold hybrid ion-atom systems}, journal = {Rev. Mod. Phys.}, volume = {91}, number = {3}, year = {2019}, month = {JUL 15}, pages = {035001}, publisher = {AMER PHYSICAL SOC}, type = {Review}, abstract = {Hybrid systems of laser-cooled trapped ions and ultracold atoms combined in a single experimental setup have recently emerged as a new platform for fundamental research in quantum physics. This paper reviews the theoretical and experimental progress in research on cold hybrid ion-atom systems which aim to combine the best features of the two well-established fields. A broad overview is provided of the theoretical description of ion-atom mixtures and their applications, and a report is given on advances in experiments with ions trapped in Paul or dipole traps overlapped with a cloud of cold atoms, and with ions directly produced in a Bose-Einstein condensate. This review begins with microscopic models describing the electronic structure, interactions, and collisional physics of ion-atom systems at low and ultralow temperatures, including radiative and nonradiative charge-transfer processes and their control with magnetically tunable Feshbach resonances. Then the relevant experimental techniques and the intrinsic properties of hybrid systems are described. In particular, the impact is discussed of the micromotion of ions in Paul traps on ion-atom hybrid systems. Next, a review of recent proposals is given for using ions immersed in ultracold gases for studying cold collisions, chemistry, many-body physics, quantum simulation, and quantum computation and their experimental realizations. The last part focuses on the formation of molecular ions via spontaneous radiative association, photoassociation, magnetoassociation, and sympathetic cooling. Applications and prospects are discussed of cold molecular ions for cold controlled chemistry and precision spectroscopy.}, issn = {0034-6861}, doi = {10.1103/RevModPhys.91.035001}, author = {Tomza, Michal and Jachymski, Krzysztof and Gerritsma, Rene and Negretti, Antonio and Calarco, Tommaso and Idziaszek, Zbigniew and Julienne, Paul S.} } @article {ISI:000478991700001, title = {Critical viscosity of a fluctuating superconductor}, journal = {Phys. Rev. B}, volume = {100}, number = {6}, year = {2019}, month = {AUG 2}, pages = {060501}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We consider a fluctuating superconductor in the vicinity of the transition temperature, T-c. The fluctuation shear viscosity is calculated. In two dimensions, the leading correction to viscosity is negative and scales as delta eta(T) alpha ln(T - T-c). Critical hydrodynamics of the fluctuating superconductor involves two fluids: a fluid of fluctuating pairs and a quasiparticle fluid of single-electron excitations. The pair viscosity (Aslamazov-Larkin) term is shown to be zero. The (density of states) correction to viscosity of single-electron excitations is negative, which is due to fluctuating pairing that results in a reduction of electron density. Scattering of electrons off of the fluctuations gives rise to an enhanced quasiparticle scattering and another (Maki-Thomson) negative correction to viscosity. Our results suggest that fluctuating superconductors provide a promising platform to investigate low-viscosity electronic media and may potentially host fermionic/electronic turbulence. Some experimental probes of two-fluid critical hydrodynamics are proposed such as time-of-flight measurement of turbulent energy cascades in critical cold atom superfluids and magnetic dynamos in three-dimensional fluctuating superconductors.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.100.060501}, author = {Liao, Yunxiang and Galitski, Victor} } @article {ISI:000461830900002, title = {Development of transmon qubits solely from optical lithography on 300 mm wafers}, journal = {Quantum Sci. Technol.}, volume = {4}, number = {2}, year = {2019}, month = {APR}, pages = {025012}, publisher = {IOP PUBLISHING LTD}, type = {Article}, abstract = {Qubit information processors are increasing in footprint but currently rely on e-beam lithography for patterning the required Josephson junctions (JJs). Advanced optical lithography is an alternative patterning method, and we report on the development of transmon qubits patterned solely with optical lithography. The lithography uses 193 nm wavelength exposure and 300 mm large silicon wafers. Qubits and arrays of evaluation JJs were patterned with process control which resulted in narrow feature distributions: a standard deviation of 0.78\% for a 220 nm linewidth pattern realized across over half the width of the wafers. Room temperature evaluation found a 2.8\%-3.6\% standard deviation in JJ resistance in completed chips. The qubits used aluminum and titanium nitride films on silicon substrates without substantial silicon etching. T-1 times of the qubits were extracted at 26-27 mu s, indicating a low level of material-based qubit defects. This study shows that large wafer optical lithography on silicon is adequate for high-quality transmon qubits, and shows a promising path for improving many-qubit processors.}, keywords = {fabrication, large wafer, QUBIT, silicon, superconducting}, issn = {2058-9565}, doi = {10.1088/2058-9565/ab0ca8}, author = {Foroozani, N. and Hobbs, C. and Hung, C. C. and Olson, S. and Ashworth, D. and Holland, E. and Malloy, M. and Kearney, P. and O{\textquoteright}Brien, B. and Bunday, B. and DiPaola, D. and Advocate, W. and Murray, T. and Hansen, P. and Novak, S. and Bennett, S. and Rodgers, M. and Baker-O{\textquoteright}Neal, B. and Sapp, B. and Barth, E. and Hedrick, J. and Goldblatt, R. and Rao, S. S. Papa and Osborn, K. D.} } @article {ISI:000460648100005, title = {Electric dipole matrix elements for the 6p(2)P(J) -> 7s(2)S(1/2) transition in atomic cesium}, journal = {Phys. Rev. A}, volume = {99}, number = {3}, year = {2019}, month = {MAR 5}, pages = {032504}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We report a measurement of the ratio of electric dipole transition matrix elements of cesium for the 6p(2)P(1/2) -> 7s(2)S(1/2) and 6p(2)P(3/2) -> 7s(2)S(1/2 )transitions. We determine this ratio of matrix elements through comparisons of two-color, two-photon excitation rates of the 7s(2)S(1/2) state using laser beams with polarizations parallel to one another vs perpendicular to one another. Our result of R < 7s(2)S(1/2)parallel to r parallel to 6P(2)P(3/2)>/< 7s(2)S(1/2)parallel to r parallel to 6P(2)P(1/2)> = 1.5272(17) is in excellent agreement with a theoretical prediction of R = 1.5270(27). Moreover, the accuracy of the experimental ratio is sufficiently high to differentiate between various theoretical approaches. To our knowledge, there are no prior experimental measurements of R. Combined with our recent determination of the lifetime of the 7s(2)S(1/2) state, we determine reduced matrix elements for these two transitions, < 7s(2)S(1/2)parallel to r parallel to 6P(2)P(3/2)> = -6.489(5)a(0) and < 7s(2)S(1/2)parallel to r parallel to 6P(2)P(1/2 >) = -4.249(4)a(0). These matrix elements are also in excellent agreement with theoretical calculations. These measurements improve knowledge of Cs properties needed for parity violation studies and provide benchmarks for tests of high-precision theory.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.99.032504}, author = {Toh, George and Damitz, Amy and Glotzbach, Nathan and Quirk, Jonah and Stevenson, I. C. and Choi, J. and Safronova, M. S. and Elliott, D. S.} } @article {ISI:000468201600010, title = {Electromagnetically induced transparency in inhomogeneously broadened solid media}, journal = {Phys. Rev. A}, volume = {99}, number = {5}, year = {2019}, month = {MAY 15}, pages = {053821}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We study, theoretically and experimentally, electromagnetically induced transparency (EIT) in two different solid-state systems. Unlike many implementations in homogeneously broadened media, these systems exhibit inhomogeneous broadening of their optical and spin transitions typical of solid-state materials. We observe EIT line shapes typical of atomic gases, including a crossover into the regime of Autler-Townes splitting, but with the substitution of the inhomogeneous widths for the homogeneous values. We obtain quantitative agreement between experiment and theory for the width of the transparency feature over a range of optical powers and inhomogeneous linewidths. We discuss regimes over which analytical and numerical treatments capture the behavior. As solid-state systems become increasingly important for scalable and integratable quantum optical and photonic devices, it is vital to understand the effects of the inhomogeneous broadening that is ubiquitous in these systems. The treatment presented here can be applied to a variety of systems, as exemplified by the common scaling of experimental results from two different systems.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.99.053821}, author = {Fan, H. Q. and Kagalwala, K. H. and Polyakov, V, S. and Migdall, A. L. and Goldschmidt, E. A.} } @article {ISI:000476581500009, title = {Evanescent modes and step-like acoustic black holes}, journal = {Ann. Phys.}, volume = {407}, year = {2019}, month = {AUG}, pages = {148-165}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, type = {Article}, abstract = {We consider a model of an acoustic black hole formed by a quasi-one dimensional Bose-Einstein condensate with a step-like horizon. This system is analyzed by solving the corresponding Bogoliubov-de Gennes equation with an appropriate matching condition at the jump. When the step is between a subsonic and supersonic flow, a sonic horizon develops and in addition to the scattering coefficients we compute the distribution of the accompanying analogue Hawking radiation. Additionally, in response to the abrupt variation in flow and non-linear Bogoliubov dispersion relation, evanescent solutions of the Bogoliubov-de Gennes equation also appear and decay out from the horizon. We bound this decay length and show that these modes produce a modulation of observables outside the event horizon by their interference with outgoing Hawking flux. We go further and find specific superpositions of ingoing eigenmodes which exhibit coherent cancellation of the Hawking flux outside the horizon but nevertheless have evanescent support outside the black hole. We conclude by speculating that when quasiparticle interactions are included, evanescent modes may yield a leakage of information across the event horizon via interactions between the real outgoing Hawking flux and the virtual evanescent modes, and that we may expect this as a generic feature of models which break Lorentz invariance at the UV (Planck) scale. (C) 2019 Elsevier Inc. All rights reserved.}, keywords = {Acoustic black hole, Analogue gravity, Bogoliubov-de Gennes quasiparticle, Bose-Einstein condensate, Evanescent mode, Hawking radiation}, issn = {0003-4916}, doi = {10.1016/j.aop.2019.04.017}, author = {Curtis, Jonathan and Refael, Gil and Galitski, Victor} } @article {ISI:000473271300044, title = {Evolution of large-scale flow from turbulence in a two-dimensional superfluid}, journal = {Science}, volume = {364}, number = {6447}, year = {2019}, month = {JUN 28}, pages = {1267+}, publisher = {AMER ASSOC ADVANCEMENT SCIENCE}, type = {Article}, abstract = {Nonequilibrium interacting systems can evolve to exhibit large-scale structure and order. In two-dimensional turbulent flow, the seemingly random swirling motion of a fluid can evolve toward persistent large-scale vortices. To explain such behavior, Lars Onsager proposed a statistical hydrodynamic model based on quantized vortices. Here, we report on the experimental confirmation of Onsager{\textquoteright}s model. We dragged a grid barrier through an oblate superfluid Bose-Einstein condensate to generate nonequilibrium distributions of vortices. We observed signatures of an inverse energy cascade driven by the evaporative heating of vortices, leading to steady-state configurations characterized by negative absolute temperatures. Our results open a pathway for quantitative studies of emergent structures in interacting quantum systems driven far from equilibrium.}, issn = {0036-8075}, doi = {10.1126/science.aat5793}, author = {Johnstone, Shaun P. and Groszek, Andrew J. and Starkey, Philip T. and Billington, Christopher J. and Simula, Tapio P. and Helmerson, Kristian} } @article {ISI:000463834800010, title = {Excitations and correlations in the driven-dissipative Bose-Hubbard model}, journal = {Phys. Rev. A}, volume = {99}, number = {4}, year = {2019}, month = {APR 4}, pages = {043607}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Using a field-theoretic approach within the Schwinger-Keldysh formalism, we study a Bose-Hubbard model in the presence of a driving field and dissipation due to one-body losses. We recover the bistability diagram from the Gross-Pitaevski equation, and analyze the different phases with respect to their elementary excitations and correlations. We find the low-density solution to be subdivided into a dynamically instable, a gapped, and a gapless regime. The correlations decay exponentially, but a substantial increase of correlation length marks the regime of gapless excitations.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.99.043607}, author = {Grass, Tobias} } @conference {ISI:000482226300153, title = {First experimental steps toward an in situ gauge for direct measurement of relativistic intensities}, booktitle = {2019 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)}, series = {Conference on Lasers and Electro-Optics}, year = {2019}, note = {Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, MAY 05-10, 2019}, publisher = {IEEE; AdValue Photon; Amer Elements; Class5 Photon; Coherent; GoFoton; Light Convers; LightTrans; MKS; OZ Opt Online; Santec; ThorLabs; UQDevices; YSL Photon}, organization = {IEEE; AdValue Photon; Amer Elements; Class5 Photon; Coherent; GoFoton; Light Convers; LightTrans; MKS; OZ Opt Online; Santec; ThorLabs; UQDevices; YSL Photon}, type = {Proceedings Paper}, abstract = {Nearly 50 years ago Sarachik and Schappert suggested an intensity gauge based on wavelength shifts due to relativistic Thomson scattering. We present the first preliminary experimental results exploiting these shifts to make a direct measurement of peak intensities above 10(18) W/cm(2). (C) 2019 The Author(s)}, isbn = {978-1-943580-57-6}, issn = {2160-9020}, author = {Hill, III, W. T. and He, C. and Roso, L. and Perez-Hernandez, J. A. and Gatti, G. and de Marco, M. and Fedosejevs, R. and Longman, A.} } @article {14546, title = {Fluctuation-Induced Torque on a Topological Insulator out of Thermal Equilibrium}, journal = {Phys. Rev. Lett.}, volume = {123}, year = {2019}, month = {Aug}, pages = {055901}, doi = {10.1103/PhysRevLett.123.055901}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.123.055901}, author = {Maghrebi, M. F. and Gorshkov, A. V. and Sau, J. D.} } @article { ISI:000489036000001, title = {Heisenberg-scaling measurement protocol for analytic functions with quantum sensor networks}, journal = {Phys. Rev. A}, volume = {100}, number = {4}, year = {2019}, month = {OCT 7}, pages = {042304}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We generalize past work on quantum sensor networks to show that, for d input parameters, entanglement can yield a factor O(d) improvement in mean-squared error when estimating an analytic function of these parameters. We show that the protocol is optimal for qubit sensors, and we conjecture an optimal protocol for photons passing through interferometers. Our protocol is also applicable to continuous variable measurements, such as one quadrature of a field operator. We outline a few potential applications, including calibration of laser operations in trapped ion quantum computing.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.100.042304}, author = {Qian, Kevin and Eldredge, Zachary and Ge, Wenchao and Pagano, Guido and Monroe, Christopher and Porto, V, J. and Gorshkov, V, Alexey} } @article { ISI:000498883600001, title = {High-Coherence Fluxonium Qubit}, journal = {Phys. Rev. X}, volume = {9}, number = {4}, year = {2019}, month = {NOV 25}, pages = {041041}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We report superconducting fluxonium qubits with coherence times largely limited by energy relaxation and reproducibly satisfying T-2 > 100 mu s (T-2 > 400 mu s in one device). Moreover, given the state-of-the-art values of the surface loss tangent and the 1/f flux-noise amplitude, the coherence time can be further improved beyond 1 ms. Our results violate a common viewpoint that the number of Josephson junctions in a superconducting circuit-over 10(2) here-must be minimized for best qubit coherence. We outline how the unique to fluxonium combination of long coherence time and large anharmonicity can benefit both gate-based and adiabatic quantum computing.}, issn = {2160-3308}, doi = {10.1103/PhysRevX.9.041041}, author = {Nguyen, Long B. and Lin, Yen-Hsiang and Somoroff, Aaron and Mencia, Raymond and Grabon, Nicholas and Manucharyan, Vladimir E.} } @article {ISI:000467473500012, title = {Imaging topology of Hofstadter ribbons}, journal = {New J. Phys.}, volume = {21}, year = {2019}, month = {MAY 8}, pages = {053021}, publisher = {IOP PUBLISHING LTD}, type = {Article}, abstract = {Physical systems with non-trivial topological order find direct applications in metrology (Klitzing et al 1980 Phys. Rev. Lett. 45 494-7) and promise future applications in quantum computing (Freedman 2001 Found. Comput. Math. 1 183-204; Kitaev 2003 Ann. Phys. 303 2-30). The quantum Hall effect derives from transverse conductance, quantized to unprecedented precision in accordance with the system{\textquoteright}s topology (Laughlin 1981 Phys. Rev. B 23 5632-33). At magnetic fields beyond the reach of current condensed matter experiment, around 10(4)T, this conductance remains precisely quantized with values based on the topological order (Thouless et al 1982 Phys. Rev. Lett. 49 405-8). Hitherto, quantized conductance has only been measured in extended 2D systems. Here, we experimentally studied narrow 2D ribbons, just 3 or 5 sites wide along one direction, using ultracold neutral atoms where such large magnetic fields can be engineered (Jaksch and Zoller 2003 New J. Phys. 5 56; Miyake et al 2013 Phys. Rev. Lett. 111 185302; Aidelsburger et al 2013 Phys. Rev. Lett. 111 185301; Celi et al 2014 Phys. Rev. Lett. 112 043001; Stuhl et al 2015 Science 349 1514; Mancini et al 2015 Science 349 1510; An et al 2017 Sci. Adv. 3). We microscopically imaged the transverse spatial motion underlying the quantized Hall effect. Our measurements identify the topological Chern numbers with typical uncertainty of 5\%, and show that although band topology is only properly defined in infinite systems, its signatures are striking even in nearly vanishingly thin systems.}, keywords = {quantum Hall effect, quantum simulation, quantum transport, ultracold atoms}, issn = {1367-2630}, doi = {10.1088/1367-2630/ab165b}, author = {Genkina, Dina and Aycock, Lauren M. and Lu, I, Hsin- and Lu, Mingwu and Pineiro, Alina M. and Spielman, I. B.} } @article {ISI:000469902700001, title = {Interaction-induced transition in the quantum chaotic dynamics of a disordered metal}, journal = {Ann. Phys.}, volume = {405}, year = {2019}, month = {JUN}, pages = {1-13}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, type = {Article}, abstract = {We demonstrate that a weakly disordered metal with short-range interactions exhibits a transition in the quantum chaotic dynamics when changing the temperature or the interaction strength. For weak interactions, the system displays exponential growth of the out-of-time-ordered correlator (OTOC) of the current operator. The Lyapunov exponent of this growth is temperature-independent in the limit of vanishing interaction. With increasing the temperature or the interaction strength, the system undergoes a transition to a non-chaotic behaviour, for which the exponential growth of the OTOC is absent. We conjecture that the transition manifests itself in the quasiparticle energy-level statistics and also discuss ways of its explicit observation in cold-atom setups. (C) 2019 Elsevier Inc. All rights reserved.}, issn = {0003-4916}, doi = {10.1016/j.aop.2019.03.008}, author = {Syzranov, V, S. and Gorshkov, V, A. and Galitski, V. M.} } @article {14826, title = {Interference of Temporally Distinguishable Photons Using Frequency-Resolved Detection}, journal = {Phys. Rev. Lett.}, volume = {123}, year = {2019}, month = {Sep}, pages = {123603}, doi = {10.1103/PhysRevLett.123.123603}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.123.123603}, author = {Orre, Venkata Vikram and Goldschmidt, Elizabeth A. and Deshpande, Abhinav and Gorshkov, Alexey V. and Tamma, Vincenzo and Hafezi, Mohammad and Mittal, Sunil} } @article {ISI:000474892400001, title = {Locality and Digital Quantum Simulation of Power-Law Interactions}, journal = {Phys. Rev. X}, volume = {9}, number = {3}, year = {2019}, month = {JUL 10}, pages = {031006}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The propagation of information in nonrelativistic quantum systems obeys a speed limit known as a Lieb-Robinson bound. We derive a new Lieb-Robinson bound for systems with interactions that decay with distance r as a power law, 1/r(alpha). The bound implies an effective light cone tighter than all previous bounds. Our approach is based on a technique for approximating the time evolution of a system, which was first introduced as part of a quantum simulation algorithm by Haah et al., FOCS{\textquoteright} 18. To bound the error of the approximation, we use a known Lieb-Robinson bound that is weaker than the bound we establish. This result brings the analysis full circle, suggesting a deep connection between Lieb-Robinson bounds and digital quantum simulation. In addition to the new Lieb-Robinson bound, our analysis also gives an error bound for the Haah et al. quantum simulation algorithm when used to simulate power-law decaying interactions. In particular, we show that the gate count of the algorithm scales with the system size better than existing algorithms when alpha > 3D (where D is the number of dimensions).}, issn = {2160-3308}, doi = {10.1103/PhysRevX.9.031006}, author = {Tran, Minh C. and Guo, Andrew Y. and Su, Yuan and Garrison, James R. and Eldredge, Zachary and Foss-Feig, Michael and Childs, Andrew M. and Gorshkov, Alexey V.} } @article { ISI:000503808100004, title = {Manifestations of spin-orbit coupling in a cuprate superconductor}, journal = {Phys. Rev. B}, volume = {100}, number = {22}, year = {2019}, month = {DEC 20}, pages = {224512}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Exciting new work on Bi2Sr2CaCu2O8+delta (Bi2212) shows the presence of nontrivial spin-orbit coupling effects as seen in spin-resolved angle-resolved photoemission spectroscopy data {[}K. Gotlieb et al., Science 362, 1271 (2018)]. Motivated by these observations we consider how the picture of spin-orbit coupling through local inversion symmetry breaking might be observed in cuprate superconductors. Furthermore, we examine two spin-orbit driven effects, the spin-Hall effect and the Edelstein effect, focusing on the details of their realizations within both the normal and superconducting states.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.100.224512}, author = {Raines, Zachary M. and Allocca, Andrew A. and Galitski, Victor M.} } @article {ISI:000485768100009, title = {Narrow-line Cooling and Determination of the Magic Wavelength of Cd}, journal = {Phys. Rev. Lett.}, volume = {123}, number = {11}, year = {2019}, month = {SEP 13}, pages = {113201}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We experimentally and theoretically determine the magic wavelength of the (5s(2))S-1(0) - (5s5p)P-3(0) clock transition of Cd-111 to be 419.88(14) and 420.1(7) nm. To perform Lamb-Dicke spectroscopy of the clock transition, we use narrow-line laser cooling on the S-1(0) - P-3(1) transition to cool the atoms to 6 mu K and load them into an optical lattice. Cadmium is an attractive candidate for optical lattice clocks because it has a small sensitivity to blackbody radiation and its efficient narrow-line cooling mitigates higher order light shifts. We calculate the blackbody shift, including the dynamic correction, to be fractionally 2.83(8) x 10(-16) at 300 K, an order of magnitude smaller than that of Sr and Yb. We also report calculations of the Cd P-1(1) lifetime and the ground state C-6 coefficient.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.123.113201}, author = {Yamaguchi, A. and Safronova, M. S. and Gibble, K. and Katori, H.} } @article {ISI:000455320600043, title = {Observation of chiral zero mode in inhomogeneous three-dimensional Weyl metamaterials}, journal = {Science}, volume = {363}, number = {6423}, year = {2019}, month = {JAN 11}, pages = {148-151}, publisher = {AMER ASSOC ADVANCEMENT SCIENCE}, type = {Article}, abstract = {Owing to the chirality of Weyl nodes, the Weyl systems can support one-way chiral zero modes under a strong magnetic field, which leads to nonconservation of chiral currents-the so-called chiral anomaly. Although promising for robust transport of optical information, the zero chiral bulk modes have not been observed in photonics. Here we design an inhomogeneous Weyl metamaterial in which a gauge field is generated for the Weyl nodes by engineering the individual unit cells. We experimentally confirm the presence of the gauge field and observe the zero-order chiral Landau level with one-way propagation. Without breaking the time-reversal symmetry, our system provides a route for designing an artificial magnetic field in three-dimensional photonic Weyl systems and may have potential for device applications in photonics.}, issn = {0036-8075}, doi = {10.1126/science.aau7707}, author = {Jia, Hongwei and Zhang, Ruixing and Gao, Wenlong and Guo, Qinghua and Yang, Biao and Hu, Jing and Bi, Yangang and Xiang, Yuanjiang and Liu, Chaoxing and Zhang, Shuang} } @article {14286, title = {Parametric Heating in a 2D Periodically Driven Bosonic System: Beyond the Weakly Interacting Regime}, journal = {Physical Review X}, volume = {9}, year = {2019}, pages = {011047}, author = {Boulier, T and Maslek, J and Bukov, M and Bracamontes, C and Magnan, E and Lellouch, S and Demler, E and Goldman, N and Porto, J V} } @article {ISI:000461066200001, title = {Parametric Heating in a 2D Periodically Driven Bosonic System: Beyond the Weakly Interacting Regime}, journal = {Phys. Rev. X}, volume = {9}, number = {1}, year = {2019}, month = {MAR 13}, pages = {011047}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We experimentally investigate the effects of parametric instabilities on the short-time heating process of periodically driven bosons in 2D optical lattices with a continuous transverse (tube) degree of freedom. We analyze three types of periodic drives: (i) linear along the x-lattice direction only, (ii) linear along the lattice diagonal, and (iii) circular in the lattice plane. In all cases, we demonstrate that the Bose-Einstein condensate (BEC) decay is dominated by the emergence of unstable Bogoliubov modes, rather than scattering in higher Floquet bands, in agreement with recent theoretical predictions. The observed BEC depletion rates are much higher when shaking along both the x and y directions, as opposed to only x or only y. We also report an explosion of the decay rates at large drive amplitudes and suggest a phenomenological description beyond the Bogoliubov theory. In this strongly coupled regime, circular drives heat faster than diagonal drives, which illustrates the nontrivial dependence of the heating on the choice of drive.}, issn = {2160-3308}, doi = {10.1103/PhysRevX.9.011047}, author = {Boulier, T. and Maslek, J. and Bukov, M. and Bracamontes, C. and Magnan, E. and Lellouch, S. and Demler, E. and Goldman, N. and Porto, V, J.} } @article {14481, title = {Perfect Andreev reflection due to the Klein paradox in a topological superconducting state}, journal = {Nature}, volume = {570}, year = {2019}, pages = {344{\textendash}348}, abstract = {In 1928, Dirac proposed a wave equation to describe relativistic electrons1. Shortly afterwards, Klein solved a simple potential step problem for the Dirac equation and encountered an apparent paradox: the potential barrier becomes transparent when its height is larger than the electron energy. For massless particles, backscattering is completely forbidden in Klein tunnelling, leading to perfect transmission through any potential barrier2,3. The recent advent of condensed-matter systems with Dirac-like excitations, such as graphene and topological insulators, has opened up the possibility of observing Klein tunnelling experimentally4{\textendash}6. In the surface states of topological insulators, fermions are bound by spin{\textendash}momentum locking and are thus immune from backscattering, which is prohibited by time-reversal symmetry. Here we report the observation of perfect Andreev reflection in point-contact spectroscopy{\textendash}-a clear signature of Klein tunnelling and a manifestation of the underlying {\textquoteleft}relativistic{\textquoteright}physics of a proximity-induced superconducting state in a topological Kondo insulator. Our findings shed light on a previously overlooked aspect of topological superconductivity and can serve as the basis for a unique family of spintronic and superconducting devices, the interface transport phenomena of which are completely governed by their helical topological states.

}, isbn = {1476-4687}, doi = {10.1038/s41586-019-1305-1}, url = {https://doi.org/10.1038/s41586-019-1305-1}, author = {Lee, Seunghun and Stanev, Valentin and Zhang, Xiaohang and Stasak, Drew and Flowers, Jack and Higgins, Joshua S. and Dai, Sheng and Blum, Thomas and Pan, Xiaoqing and Yakovenko, Victor M. and Paglione, Johnpierre and Greene, Richard L. and Galitski, Victor and Takeuchi, Ichiro} } @article {14466, title = {Photonic quadrupole topological phases}, journal = {Nature Photonics}, year = {2019}, abstract = {The topological phases of matter are characterized using the Berry phase, a geometrical phase associated with the energy-momentum band structure. The quantization of the Berry phase and the associated wavefunction polarization manifest as remarkably robust physical observables, such as quantized Hall conductivity and disorder-insensitive photonic transport1{\textendash}5. Recently, a novel class of topological phases, called higher-order topological phases, were proposed by generalizing the fundamental relationship between the Berry phase and quantized polarization, from dipole to multipole moments6{\textendash}8. Here, we demonstrate photonic realization of the quantized quadrupole topological phase, using silicon photonics. In our two-dimensional second-order topological phase, we show that the quantization of the bulk quadrupole moment manifests as topologically robust zero-dimensional corner states. We contrast these topological states against topologically trivial corner states in a system without bulk quadrupole moment, where we observe no robustness. Our photonic platform could enable the development of robust on-chip classical and quantum optical devices with higher-order topological protection.

}, isbn = {1749-4893}, doi = {10.1038/s41566-019-0452-0}, url = {https://doi.org/10.1038/s41566-019-0452-0}, author = {Mittal, Sunil and Orre, Venkata Vikram and Zhu, Guanyu and Gorlach, Maxim A. and Poddubny, Alexander and Hafezi, Mohammad} } @article {ISI:000485202800004, title = {Probing Ground-State Phase Transitions through Quench Dynamics}, journal = {Phys. Rev. Lett.}, volume = {123}, number = {11}, year = {2019}, month = {SEP 11}, pages = {115701}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The study of quantum phase transitions requires the preparation of a many-body system near its ground state, a challenging task for many experimental systems. The measurement of quench dynamics, on the other hand, is now a routine practice in most cold atom platforms. Here we show that quintessential ingredients of quantum phase transitions can be probed directly with quench dynamics in integrable and nearly integrable systems. As a paradigmatic example, we study global quench dynamics in a transverse-field Ising model with either short-range or long-range interactions. When the model is integrable, we discover a new dynamical critical point with a nonanalytic signature in the short-range correlators. The location of the dynamical critical point matches that of the quantum critical point and can be identified using a finite-time scaling method. We extend this scaling picture to systems near integrability and demonstrate the continued existence of a dynamical critical point detectable at prethermal timescales. We quantify the difference in the locations of the dynamical and quantum critical points away from (but near) integrability. Thus, we demonstrate that this method can be used to approximately locate the quantum critical point near integrability. The scaling method is also relevant to experiments with finite time and system size, and our predictions are testable in near-term experiments with trapped ions and Rydberg atoms.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.123.115701}, author = {Titum, Paraj and Iosue, Joseph T. and Garrison, James R. and Gorshkov, Alexey V. and Gong, Zhe-Xuan} } @article {ISI:000484374000020, title = {Quantum electrodynamics of a superconductor-insulator phase transition}, journal = {Nat. Phys.}, volume = {15}, number = {9}, year = {2019}, month = {SEP}, pages = {930+}, publisher = {NATURE PUBLISHING GROUP}, type = {Article}, abstract = {A chain of Josephson junctions represents one of the simplest many-body models undergoing a superconductor-insulator quantum phase transition(1,2). Apart from zero resistance, the superconducting state is necessarily accompanied by a sound-like mode due to collective oscillations of the phase of the complex-valued order parameter(3,4). Little is known about the fate of this mode on entering the insulating state, where the order parameter{\textquoteright}s amplitude remains non-zero, but the phase ordering is {\textquoteleft}melted{\textquoteright} by quantum fluctuations(5). Here, we show that the phase mode survives far into the insulating regime, such that megaohm-resistance chains can carry gigahertz-frequency alternating currents as nearly ideal superconductors. The insulator reveals itself through interaction-induced broadening and random frequency shifts of collective mode resonances. Our spectroscopic experiment puts forward the problem of quantum electrodynamics of a Bose glass for both theory and experiments(6-8). By pushing the chain parameters deeper into the insulating state, we achieved a wave impedance of the phase mode exceeding the predicted critical value by an order of magnitude(9-14). The effective fine structure constant of such a one-dimensional electromagnetic vacuum exceeds unity, promising transformative applications to quantum science and technology.}, issn = {1745-2473}, doi = {10.1038/s41567-019-0553-1}, author = {Kuzmin, R. and Mencia, R. and Grabon, N. and Mehta, N. and Lin, Y-H and Manucharyan, V. E.} } @article { ISI:000496930000002, title = {Quantum Interference between Photons from an Atomic Ensemble and a Remote Atomic Ion}, journal = {Phys. Rev. Lett.}, volume = {123}, number = {21}, year = {2019}, month = {NOV 18}, pages = {213601}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Many remote-entanglement protocols rely on the generation and interference of photons produced by nodes within a quantum network. Quantum networks based on heterogeneous nodes provide a versatile platform by utilizing the complementary strengths of the differing systems. Implementation of such networks is challenging, due to the disparate spectral and temporal characteristics of the photons generated by the different quantum systems. Here, we report on the observation of quantum interference between photons generated from a single ion and an atomic ensemble. The photons are produced on demand by each source located in separate buildings, in a manner suitable for quantum networking. Given these results, we analyze the feasibility of hybrid ion-ensemble remote entanglement generation.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.123.213601}, author = {Craddock, A. N. and Hannegan, J. and Ornelas-Huerta, D. P. and Siverns, J. D. and Hachtel, A. J. and Goldschmidt, A. and Porto, J. V. and Quraishi, Q. and Rolston, S. L.} } @article { ISI:000500743400001, title = {Rydberg-Mediated Entanglement in a Two-Dimensional Neutral Atom Qubit Array}, journal = {Phys. Rev. Lett.}, volume = {123}, number = {23}, year = {2019}, month = {DEC 4}, pages = {230501}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We demonstrate high fidelity two-qubit Rydberg blockade and entanglement on a pair of sites in a large two-dimensional qubit array. The qubit array is defined by a grid of blue detuned lines of light with 121 sites for trapping atomic qubits. Improved experimental methods have increased the observed Bell state fidelity to F-Bell = 0.86(2). Accounting for errors in state preparation and measurement we infer a fidelity of F-(SPAM)(Bell) = 0.88. Accounting for errors in single qubit operations we infer that a Bell state created with the Rydberg mediated C-Z gate has a fidelity of F-Bell(CZ) = 0.89. Comparison with a detailed error model based on quantum process matrices indicates that finite atom temperature and laser noise are the dominant error sources contributing to the observed gate infidelity.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.123.230501}, author = {Graham, T. M. and Kwon, M. and Grinkemeyer, B. and Marra, Z. and Jiang, X. and Lichtman, M. T. and Sun, Y. and Ebert, M. and Saffman, M.} } @article {ISI:000482547000001, title = {Sauter-Schwinger effect with a quantum gas}, journal = {New J. Phys.}, volume = {21}, year = {2019}, month = {AUG 21}, pages = {083035}, publisher = {IOP PUBLISHING LTD}, type = {Article}, abstract = {The creation of particle-antiparticle pairs from vacuum by a large electric field is at the core of quantum electrodynamics. Despite the wide acceptance that this phenomenon occurs naturally when electric field strengths exceed E-c approximate to 10(18) Vm(-1), it has yet to be experimentally observed due to the limitations imposed by producing electric fields at this scale. The high degree of experimental control present in ultracold atomic systems allow experimentalists to create laboratory analogs to high-field phenomena. Here we emulated massive relativistic particles subject to large electric field strengths, thereby quantum-simulated particle-antiparticle pair creation, and experimentally explored particle creation from {\textquoteleft}the Dirac vacuum{\textquoteright}. Data collected from our analog system spans the full parameter regime from low applied field (negligible pair creation) below the Sauter-Schwinger limit, to high field (maximum rate of pair creation) far in excess of the Sauter-Schwinger limit. In our experiment, we perform direct measurements on an analog atomic system and show that this high-field phenomenon is well-characterized by Landau-Zener tunneling, well known in the atomic physics context, and we find full quantitative agreement with theory with no adjustable parameters.}, keywords = {particle creation, quantum gases, quantum simulation, Sauter-Schwinger effect}, issn = {1367-2630}, doi = {10.1088/1367-2630/ab3840}, author = {Pineiro, A. M. and Genkina, D. and Lu, Mingwu and Spielman, I. B.} } @article {ISI:000462935500003, title = {Scale-Invariant Continuous Entanglement Renormalization of a Chern Insulator}, journal = {Phys. Rev. Lett.}, volume = {122}, number = {12}, year = {2019}, month = {MAR 27}, pages = {120502}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The multiscale entanglement renormalization ansatz (MERA) postulates the existence of quantum circuits that renormalize entanglement in real space at different length scales. Chem insulators, however, cannot have scale-invariant discrete MERA circuits with a finite bond dimension. In this Letter, we show that the continuous MERA (cMERA), a modified version of MERA adapted for field theories, possesses a fixed point wave function with a nonzero Chern number. Additionally, it is well known that reversed MERA circuits can be used to prepare quantum states efficiently in time that scales logarithmically with the size of the system. However, state preparation via MERA typically requires the advent of a full-fledged universal quantum computer. In this Letter, we demonstrate that our cMERA circuit can potentially be realized in existing analog quantum computers, i.e., an ultracold atomic Fermi gas in an optical lattice with light-induced spin-orbit coupling.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.122.120502}, author = {Chu, Su-Kuan and Zhu, Guanyu and Garrison, James R. and Eldredge, Zachary and Curiel, Ana Valdes and Bienias, Przemyslaw and Spielman, I. B. and Gorshkov, V, Alexey} } @article { ISI:000490353500045, title = {A Spin-Photon Interface Using Charge-Tunable Quantum Dots Strongly Coupled to a Cavity}, journal = {Nano Lett.}, volume = {19}, number = {10}, year = {2019}, month = {OCT}, pages = {7072-7077}, publisher = {AMER CHEMICAL SOC}, type = {Article}, abstract = {Charged quantum dots containing an electron or hole spin are bright solid-state qubits suitable for quantum networks and distributed quantum computing. Incorporating such quantum dot spin into a photonic crystal cavity creates a strong spin-photon interface in which the spin can control a photon by modulating the cavity reflection coefficient. However, previous demonstrations of such spin-photon interfaces have relied on quantum dots that are charged randomly by nearby impurities, leading to instability in the charge state, which causes poor contrast in the cavity reflectivity. Here we demonstrate a strong spin-photon interface using a quantum dot that is charged deterministically with a diode structure. By incorporating this actively charged quantum dot in a photonic crystal cavity, we achieve strong coupling between the cavity mode and the negatively charged state of the dot. Furthermore, by initializing the spin through optical pumping, we show strong spin-dependent modulation of the cavity reflectivity, corresponding to a cooperativity of 12. This spin-dependent reflectivity is important for mediating entanglement between spins using photons, as well as generating strong photon-photon interactions for applications in quantum networking and distributed quantum computing.}, keywords = {cavity quantum electrodynamics, Quantum Dots, single electron spin, strong light-matter interaction}, issn = {1530-6984}, doi = {10.1021/acs.nanolett.9b02443}, author = {Luo, Zhouchen and Sun, Shuo and Karasahin, Aziz and Bracker, Allan S. and Carter, Samuel G. and Yakes, Michael K. and Gammon, Daniel and Waks, Edo} } @article { ISI:000492332900005, title = {Stroboscopic approach to trapped-ion quantum information processing with squeezed phonons}, journal = {Phys. Rev. A}, volume = {100}, number = {4}, year = {2019}, month = {OCT 24}, pages = {043417}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {In trapped-ion quantum information processing, interactions between spins (qubits) are mediated by collective modes of motion of an ion crystal. While there are many different experimental strategies to design such interactions, they all face both technical and fundamental limitations to the achievable coherent interaction strength. In general, obtaining strong interactions and fast gates is an ongoing challenge. Here, we extend previous work {[}W. Ge, B. C. Sawyer, J. W. Britton, K. Jacobs, J. J. Bollinger, and M. Foss-Feig, Phys. Rev. Lett. 122, 030501 (2019)] and present a general strategy for enhancing the interaction strengths in trapped-ion systems via parametric amplification of the ions{\textquoteright} motion. Specifically, we propose a stroboscopic protocol using alternating applications of parametric amplification and spin-motion coupling. In comparison with the previous work, we show that the current protocol can lead to larger enhancements in the coherent interaction that increase exponentially with the gate time.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.100.043417}, author = {Ge, Wenchao and Sawyer, Brian C. and Britton, Joseph W. and Jacobs, Kurt and Foss-Feig, Michael and Bollinger, John J.} } @article { ISI:000492968000008, title = {Supercurrent interference in semiconductor nanowire Josephson junctions}, journal = {Phys. Rev. B}, volume = {100}, number = {15}, year = {2019}, month = {OCT 28}, pages = {155431}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Semiconductor-superconductor hybrid systems provide a promising platform for hosting unpaired Majorana fermions towards the realization of fault-tolerant topological quantum computing. In this study we employ the Keldysh nonequilibrium Green{\textquoteright}s function formalism to model quantum transport in normal-superconductor junctions. We analyze III-V semiconductor nanowire Josephson junctions (InAs/Nb) using a three-dimensional discrete lattice model described by the Bogoliubov-de Gennes Hamiltonian in the tight-binding approximation, and compute the Andreev bound state spectrum and current-phase relations. Recent experiments {[}Zuo et al., Phys. Rev. Lett. 119, 187704 (2017) and Gharavi et al., arXiv: 1405.7455] reveal critical current oscillations in these devices, and our simulations confirm these to be an interference effect of the transverse subbands in the nanowire. We add disorder to model coherent scattering and study its effect on the critical current oscillations, with an aim to gain a thorough understanding of the experiments. The oscillations in the disordered junction are highly sensitive to the particular realization of the random disorder potential, and to the gate voltage. A macroscopic current measurement thus gives us information about the microscopic profile of the junction. Finally, we study dephasing in the channel by including elastic phase-breaking interactions. The oscillations thus obtained are in good qualitative agreement with the experimental data, and this signifies the essential role of phase-breaking processes in III-V semiconductor nanowire Josephson junctions.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.100.155431}, author = {Sriram, Praveen and Kalantre, Sandesh S. and Gharavi, Kaveh and Baugh, Jonathan and Muralidharan, Bhaskaran} } @article { ISI:000459821800002, title = {Superstrong coupling in circuit quantum electrodynamics}, journal = {NPJ QUANTUM INFORMATION}, volume = {5}, year = {2019}, month = {FEB 25}, pages = {20}, issn = {2056-6387}, doi = {10.1038/s41534-019-0134-2}, author = {Kuzmin, Roman and Mehta, Nitish and Grabon, Nicholas and Mencia, Raymond and Manucharyan, Vladimir E.} } @article {14281, title = {Theory of Bose condensation of light via laser cooling of atoms}, journal = {Phys. Rev. A}, volume = {99}, year = {2019}, month = {Mar}, pages = {031801}, author = {Wang, Chiao-Hsuan and Gullans, M. J. and Porto, J. V. and Phillips, William D. and Taylor, Jacob M.} } @article {ISI:000461896700001, title = {Theory of Bose condensation of light via laser cooling of atoms}, journal = {Phys. Rev. A}, volume = {99}, number = {3}, year = {2019}, month = {MAR 14}, pages = {031801}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {A Bose-Einstein condensate (BEC) is a quantum phase of matter achieved at low temperatures. Photons, one of the most prominent species of bosons, do not typically condense due to the lack of a particle number conservation. We recently described a photon thermalization mechanism which gives rise to a grand canonical ensemble of light with effective photon number conservation between a subsystem and a particle reservoir. This mechanism occurs during Doppler laser cooling of atoms where the atoms serve as a temperature reservoir while the cooling laser photons serve as a particle reservoir. In contrast to typical discussions of BEC, our system is better treated with a controlled chemical potential rather than a controlled particle number, and is subject to energy-dependent loss. Here, we address the question of the possibility of a BEC of photons in this laser cooling photon thermalization scenario and theoretically demonstrate that a Bose condensation of photons can be realized by cooling an ensemble of two-level atoms (realizable with alkaline-earth atoms) inside a Fabry-Perot cavity.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.99.031801}, author = {Wang, Chiao-Hsuan and Gullans, M. J. and Porto, V, J. and Phillips, William D. and Taylor, Jacob M.} } @article {ISI:000471983100001, title = {Thermal radiation as a probe of one-dimensional electron liquids}, journal = {Phys. Rev. B}, volume = {99}, number = {23}, year = {2019}, month = {JUN 11}, pages = {235124}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Motivated by recent developments in the field of plasmonics, we develop the theory of radiation from one-dimensional electron liquids, showing that the spectrum of thermal radiation emitted from the system exhibits signatures of non-Fermi liquid behavior. We derive a multipole expansion for the radiation based on the Tomonaga-Luttinger liquid model. While the dipole radiation pattern is determined by the conductivity of the system, we demonstrate that the quadrupole radiation can reveal important features of the quantum liquid, such as the Luttinger parameter. Radiation offers a probe of the interactions of the system, including Mott physics as well as nonlinear Luttinger liquid behavior. We show that these effects can be probed in current experiments on effectively one-dimensional electron liquids, such as carbon nanotubes.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.99.235124}, author = {DeGottardi, Wade and Gullans, Michael J. and Hegde, Suraj and Vishveshwara, Smitha and Hafezi, Mohammad} } @article {ISI:000462967000002, title = {Topological photonics}, journal = {Rev. Mod. Phys.}, volume = {91}, number = {1}, year = {2019}, month = {MAR 25}, pages = {015006}, publisher = {AMER PHYSICAL SOC}, type = {Review}, abstract = {Topological photonics is a rapidly emerging field of research in which geometrical and topological ideas are exploited to design and control the behavior of light. Drawing inspiration from the discovery of the quantum Hall effects and topological insulators in condensed matter, recent advances have shown how to engineer analogous effects also for photons, leading to remarkable phenomena such as the robust unidirectional propagation of light, which hold great promise for applications. Thanks to the flexibility and diversity of photonics systems, this field is also opening up new opportunities to realize exotic topological models and to probe and exploit topological effects in new ways. This article reviews experimental and theoretical developments in topological photonics across a wide range of experimental platforms, including photonic crystals, waveguides, metamaterials, cavities, optomechanics, silicon photonics, and circuit QED. A discussion of how changing the dimensionality and symmetries of photonics systems has allowed for the realization of different topological phases is offered, and progress in understanding the interplay of topology with non-Hermitian effects, such as dissipation, is reviewed. As an exciting perspective, topological photonics can be combined with optical nonlinearities, leading toward new collective phenomena and novel strongly correlated states of light, such as an analog of the fractional quantum Hall effect.}, issn = {0034-6861}, doi = {10.1103/RevModPhys.91.015006}, author = {Ozawa, Tomoki and Price, Hannah M. and Amo, Alberto and Goldman, Nathan and Hafezi, Mohammad and Lu, Ling and Rechtsman, Mikael C. and Schuster, David and Simon, Jonathan and Zilberberg, Oded and Carusotto, Iacopo} } @article { ISI:000489954500050, title = {Towards an in situ, full-power gauge of the focal-volume intensity of petawatt-class lasers}, journal = {Opt. Express}, volume = {27}, number = {21}, year = {2019}, month = {OCT 14}, pages = {30020-30030}, publisher = {OPTICAL SOC AMER}, type = {Article}, abstract = {About 50 years ago, Sarachick and Schappert {[}Phys. Rev. D. 1, 2738-2752 (1970)] showed that relativistic Thomson scattering leads to wavelength shifts that are proportional to the laser intensity. About 28 years later, Chen et al. {[}Nature 396, 653-655 (1998)] used these shifts to estimate their laser intensity near 10(18) W/cm(2). More recently, there have been several theoretical studies aimed at exploiting nonlinear Thomson scattering as a tool for direct measurement of intensities well into the relativistic regime. We present the first quantitative study of this approach for intensities between 10(18) and 10(19) W/cm(2). We show that the spectral shifts are in reasonable agreement with estimates of the peak intensity extracted from images of the focal area obtained at reduced power. Finally, we discuss the viability of the approach, its range of usefulness and how it might be extended to gauge intensities well in excess of 10(19) W/cm(2). (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement}, issn = {1094-4087}, doi = {10.1364/OE.27.030020}, author = {He, C. Z. and Longman, A. and Perez-Hernandez, J. A. and de Marco, M. and Salgado, C. and Zeraouli, G. and Gatti, G. and Roso, L. and Fedosejevs, R. and Hill, III, W. T.} } @article {14841, title = {Training of quantum circuits on a hybrid quantum computer}, journal = {Science Advances}, volume = {5}, year = {2019}, abstract = {Generative modeling is a flavor of machine learning with applications ranging from computer vision to chemical design. It is expected to be one of the techniques most suited to take advantage of the additional resources provided by near-term quantum computers. Here, we implement a data-driven quantum circuit training algorithm on the canonical Bars-and-Stripes dataset using a quantum-classical hybrid machine. The training proceeds by running parameterized circuits on a trapped ion quantum computer and feeding the results to a classical optimizer. We apply two separate strategies, Particle Swarm and Bayesian optimization to this task. We show that the convergence of the quantum circuit to the target distribution depends critically on both the quantum hardware and classical optimization strategy. Our study represents the first successful training of a high-dimensional universal quantum circuit and highlights the promise and challenges associated with hybrid learning schemes.

}, doi = {10.1126/sciadv.aaw9918}, url = {https://advances.sciencemag.org/content/5/10/eaaw9918}, author = {Zhu, D. and Linke, N. M. and Benedetti, M. and Landsman, K. A. and Nguyen, N. H. and Alderete, C. H. and Perdomo-Ortiz, A. and Korda, N. and Garfoot, A. and Brecque, C. and Egan, L. and Perdomo, O. and Monroe, C.} } @article {ISI:000456782500003, title = {Trapped Ion Quantum Information Processing with Squeezed Phonons}, journal = {Phys. Rev. Lett.}, volume = {122}, number = {3}, year = {2019}, month = {JAN 24}, pages = {030501}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Trapped ions offer a pristine platform for quantum computation and simulation, but improving their coherence remains a crucial challenge. Here, we propose and analyze a new strategy to enhance the coherent interactions in trapped ion systems via parametric amplification of the ions{\textquoteright} motion-by squeezing the collective motional modes (phonons), the spin-spin interactions they mediate can be significantly enhanced. We illustrate the power of this approach by showing how it can enhance collective spin states useful for quantum metrology, and how it can improve the speed and fidelity of two-qubit gates in multi-ion systems, important ingredients for scalable trapped ion quantum computation. Our results are also directly relevant to numerous other physical platforms in which spin interactions are mediated by bosons.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.122.030501}, author = {Ge, Wenchao and Sawyer, Brian C. and Britton, Joseph W. and Jacobs, Kurt and Bollinger, John J. and Foss-Feig, Michael} } @article {ISI:000460722900001, title = {Tunable surface plasmons in Weyl semimetals TaAs and NbAs}, journal = {Phys. Rev. B}, volume = {99}, number = {12}, year = {2019}, month = {MAR 4}, pages = {121401}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {By means of high-resolution electron energy loss spectroscopy, we investigate the low-energy excitation spectrum of transition-metal monopnictides hosting Weyl fermions. We observe gapped plasmonic modes in (001)-oriented surfaces of single crystals of NbAs and TaAs at 66 and 68 meV, respectively. Our findings are consistent with theory and we estimate an effective Coulomb interaction strength alpha(eff) approximate to 0.41 for both samples. We also demonstrate that the modification of the surface of transition-metal monopnictides by the adsorption of chemical species (in our case, oxygen and hydrocarbon fragments) changes the frequency of the plasmonic excitations, with a subsequent modification of the effective interaction strength in the 0.30-0.48 range. The remarkable dependence of plasmonic features on the presence of adsorbates paves the way for plasmonic sensors based on Weyl semimetals operating in the mid-infrared.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.99.121401}, author = {Chiarello, Gennaro and Hofmann, Johannes and Li, Zhilin and Fabio, Vito and Guo, Liwei and Chen, Xiaolong and S. Das Sarma and Politano, Antonio} } @article {ISI:000475499200001, title = {Universal level statistics of the out-of-time-ordered operator}, journal = {Phys. Rev. B}, volume = {100}, number = {3}, year = {2019}, month = {JUL 15}, pages = {035112}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The out-of-time-ordered correlator has been proposed as an indicator of chaos in quantum systems due to its simple interpretation in the semiclassical limit. In particular, its rate of possible exponential growth at h -> 0 is closely related to the classical Lyapunov exponent. Here we explore how this approach to quantum chaos relates to the random-matrix theoretical description. To do so, we introduce and study the level statistics of the logarithm of the out-of-time-ordered operator, (Lambda) over cap (t) = In (-{[}(x) over cap (t),(p) over cap (x)(0)](2) )/(2t), that we dub the {\textquoteleft}{\textquoteleft}Lyapunovian{{\textquoteright}{\textquoteright}} or {\textquoteleft}{\textquoteleft}Lyapunov operator{{\textquoteright}{\textquoteright}} for brevity. The Lyapunovian{\textquoteright}s level statistics is calculated explicitly for the quantum stadium billiard. It is shown that in the bulk of the filtered spectrum, this statistics perfectly aligns with the Wigner-Dyson distribution. One of the advantages of looking at the spectral statistics of this operator is that it has a well-defined semiclassical limit where it reduces to the matrix of uncorrelated classical finite-time Lyapunov exponents in a partitioned phase space. We provide a heuristic picture interpolating these two limits using Moyal quantum mechanics. Our results show that the Lyapunov operator may serve as a useful tool to characterize quantum chaos and in particular quantum-to-classical correspondence in chaotic systems by connecting the semiclassical Lyapunov growth at early times, when the quantum effects are weak, to universal level repulsion that hinges on strong quantum interference effects.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.100.035112}, author = {Rozenbaum, Efim B. and Ganeshan, Sriram and Galitski, Victor} } @article { ISI:000442061000007, title = {Analogue stochastic gravity in strongly-interacting Bose-Einstein condensates}, journal = {ANNALS OF PHYSICS}, volume = {395}, year = {2018}, month = {AUG}, pages = {84-111}, keywords = {Collective modes, General relativity, Quantum fluids, Stochastic dynamics}, issn = {0003-4916}, doi = {10.1016/j.aop.2018.05.009}, author = {Keser, Aydin Cem and Galitski, Victor} } @article { ISI:000435333100006, title = {Anisotropic exciton transport in transition-metal dichalcogenides}, journal = {PHYSICAL REVIEW B}, volume = {97}, number = {24}, year = {2018}, month = {JUN 14}, pages = {245411}, issn = {2469-9950}, doi = {10.1103/PhysRevB.97.245411}, author = {Ghazaryan, Areg and Hafezi, Mohammad and Ghaemi, Pouyan} } @article { ISI:000452687700006, title = {Anomalous normal-state resistivity in superconducting La2-xCexCuO4: Fermi liquid or strange metal?}, journal = {PHYSICAL REVIEW B}, volume = {98}, number = {22}, year = {2018}, month = {DEC 10}, pages = {224503}, abstract = {We present experimental results for the in-plane resistivity of the electron-doped cuprate superconductor La2-xCexCuO4 above its transition temperature T-c as a function of Ce doping x and temperature. For the doping x between 0.11 and 0.17, where T-c varies from 30 K (x = 0.11) to 5 K (x = 0.17), we find that the resistivity shows a T-2 behavior for all values of doping over the measurement range from 70 to 250 K. The coefficient of the T-2 resistivity term decreases with increasing x following the trend in We analyze our data theoretically and posit that n-type cuprates are better thought of as strange metals. Although the quadratic temperature dependence appears to be in naive agreement with the Fermi-liquid (FL) expectations, the facts that the measured resistivity is large and approximate T-2 scattering dominates the resistivity even up to 400 K argue against a standard normal-metal FL picture being applicable. We discuss possible origins of the strange-metal behavior.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.98.224503}, author = {Sarkar, Tarapada and Greene, Richard L. and S. Das Sarma} } @article {10551, title = {Asymmetric Particle Transport and Light-Cone Dynamics Induced by Anyonic Statistics}, journal = {Phys. Rev. Lett.}, volume = {121}, year = {2018}, month = {Dec}, pages = {250404}, doi = {10.1103/PhysRevLett.121.250404}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.121.250404}, author = {Liu, Fangli and Garrison, James R. and Deng, Dong-Ling and Gong, Zhe-Xuan and Gorshkov, Alexey V.} } @article { ISI:000423228300001, title = {Chiral spin currents in a trapped-ion quantum simulator using Floquet engineering}, journal = {PHYSICAL REVIEW A}, volume = {97}, number = {1}, year = {2018}, month = {JAN 19}, pages = {010302}, issn = {2469-9926}, doi = {10.1103/PhysRevA.97.010302}, author = {Grass, Tobias and Celi, Alessio and Pagano, Guido and Lewenstein, Maciej} } @article {9151, title = {Dark State Optical Lattice with a Subwavelength Spatial Structure}, journal = {Phys. Rev. Lett.}, volume = {120}, year = {2018}, month = {Feb}, pages = {083601}, doi = {10.1103/PhysRevLett.120.083601}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.120.083601}, author = {Wang, Y. and Subhankar, S. and Bienias, P and {\L}{\k a}cki, M. and Tsui, T-C. and Baranov, M. A. and Gorshkov, A. V. and Zoller, P. and Porto, J. V. and Rolston, S. L.} } @article { ISI:000429937300002, title = {Demonstration of Protection of a Superconducting Qubit from Energy Decay}, journal = {PHYSICAL REVIEW LETTERS}, volume = {120}, number = {15}, year = {2018}, month = {APR 13}, pages = {150503}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.120.150503}, author = {Lin, Yen-Hsiang and Nguyen, Long B. and Grabon, Nicholas and San Miguel, Jonathan and Pankratova, Natalia and Manucharyan, Vladimir E.} } @article {ISI:000426249900005, title = {Dissipation-induced dipole blockade and antiblockade in driven Rydberg systems}, journal = {PHYSICAL REVIEW A}, volume = {97}, number = {2}, year = {2018}, month = {FEB 28}, pages = {023424}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We study theoretically and experimentally the competing blockade and antiblockade effects induced by spontaneously generated contaminant Rydberg atoms in driven Rydberg systems. These contaminant atoms provide a source of strong dipole-dipole interactions and play a crucial role in the system{\textquoteright}s behavior. We study this problem theoretically using two different approaches. The first is a cumulant expansion approximation, in which we ignore third-order and higher connected correlations. Using this approach for the case of resonant drive, a many-body blockade radius picture arises, and we find qualitative agreement with previous experimental results. We further predict that as the atomic density is increased, the Rydberg population{\textquoteright}s dependence on Rabi frequency will transition from quadratic to linear dependence at lower Rabi frequencies. We study this behavior experimentally by observing this crossover at two different atomic densities. We confirm that the larger density system has a smaller crossover Rabi frequency than the smaller density system. The second theoretical approach is a set of phenomenological inhomogeneous rate equations. We compare the results of our rate-equation model to the experimental observations {[}E. A. Goldschmidt et al., Phys. Rev. Lett. 116, 113001 (2016)] and find that these rate equations provide quantitatively good scaling behavior of the steady-state Rydberg population for both resonant and off-resonant drives.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9926}, doi = {10.1103/PhysRevA.97.023424}, author = {Young, Jeremy T. and Boulier, Thomas and Magnan, Eric and Goldschmidt, Elizabeth A. and Wilson, Ryan M. and Rolston, Steven L. and Porto, James V. and Gorshkov, Alexey V.} } @article { ISI:000439744700003, title = {Distributed Quantum Metrology with Linear Networks and Separable Inputs}, journal = {PHYSICAL REVIEW LETTERS}, volume = {121}, number = {4}, year = {2018}, month = {JUL 25}, pages = {043604}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.121.043604}, author = {Ge, Wenchao and Jacobs, Kurt and Eldredge, Zachary and Gorshkov, V, Alexey and Foss-Feig, Michael} } @article { ISI:000432971400001, title = {Does a Single Eigenstate Encode the Full Hamiltonian?}, journal = {PHYSICAL REVIEW X}, volume = {8}, number = {2}, year = {2018}, month = {APR 30}, pages = {021026}, issn = {2160-3308}, doi = {10.1103/PhysRevX.8.021026}, author = {Garrison, James R. and Grover, Tarun} } @article {10101, title = {Dynamical Phase Transitions in Sampling Complexity}, journal = {Phys. Rev. Lett.}, volume = {121}, year = {2018}, month = {Jul}, pages = {030501}, doi = {10.1103/PhysRevLett.121.030501}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.121.030501}, author = {Deshpande, Abhinav and Fefferman, Bill and Tran, Minh C. and Foss-Feig, Michael and Gorshkov, Alexey V.} } @article {10476, title = {Dynamo Effect and Turbulence in Hydrodynamic Weyl Metals}, journal = {Phys. Rev. Lett.}, volume = {121}, year = {2018}, month = {Oct}, pages = {176603}, doi = {10.1103/PhysRevLett.121.176603}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.121.176603}, author = {Galitski, Victor and Kargarian, Mehdi and Syzranov, Sergey} } @article {ISI:000430601100005, title = {Effects of resonant-laser excitation on the emission properties in a single quantum dot}, journal = {OPTICA}, volume = {5}, number = {4}, year = {2018}, month = {APR 20}, pages = {354-359}, publisher = {OPTICAL SOC AMER}, type = {Article}, abstract = {While many solid-state emitters can be optically excited non-resonantly, resonant excitation is necessary for many quantum information protocols as it often maximizes the non-classicality of the emitted light. Here, we study the resonance fluorescence in a solid-state system-a quantum dot-with the addition of weak, non-resonant light. In the inelastic scattering regime, changes in the resonance fluorescence intensity and linewidth are linked to both the non-resonant and resonant laser powers. Details of the intensity change indicate that charge-carrier loss from the quantum dot is resonant laser. As we enter the Mollow triplet regime, this resonant laser loss term rate is approximately 1/50 ns(-1). This work further clarifies resonance fluorescence in solid-state systems and will aid in the further improvement of solid-state non-classical light sources.}, \%\%Address = {2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA}, issn = {2334-2536}, doi = {10.1364/OPTICA.5.000354}, author = {Gazzano, O. and Huber, T. and Loo, V and Polyakov, S. and Flagg, E. B. and Solomon, G. S.} } @article { ISI:000450048400053, title = {Emergence of multi-body interactions in a fermionic lattice clock}, journal = {NATURE}, volume = {563}, number = {7731}, year = {2018}, month = {NOV 15}, pages = {369+}, issn = {0028-0836}, doi = {10.1038/s41586-018-0661-6}, author = {Goban, A. and Hutson, R. B. and Marti, G. E. and Campbell, S. L. and Perlin, M. A. and Julienne, P. S. and D{\textquoteright}Incao, J. P. and Rey, A. M. and Ye, J.} } @article { ISI:000439974200006, title = {Fingerprints of Berry phases in the bulk exciton spectrum of a topological insulator}, journal = {PHYSICAL REVIEW B}, volume = {98}, number = {4}, year = {2018}, month = {JUL 27}, pages = {045430}, issn = {2469-9950}, doi = {10.1103/PhysRevB.98.045430}, author = {Allocca, Andrew A. and Efimkin, Dmitry K. and Galitski, Victor M.} } @article {10546, title = {Fractional Quantum Hall Phases of Bosons with Tunable Interactions: From the Laughlin Liquid to a Fractional Wigner Crystal}, journal = {Phys. Rev. Lett.}, volume = {121}, year = {2018}, month = {Dec}, pages = {253403}, doi = {10.1103/PhysRevLett.121.253403}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.121.253403}, author = {Gra{\ss}, Tobias and Bienias, Przemyslaw and Gullans, Michael J. and Lundgren, Rex and Maciejko, Joseph and Gorshkov, Alexey V.} } @article { ISI:000448973100018, title = {Giant anomalous Nernst effect and quantum-critical scaling in a ferromagnetic semimetal}, journal = {NATURE PHYSICS}, volume = {14}, number = {11}, year = {2018}, month = {NOV}, pages = {1119+}, issn = {1745-2473}, doi = {10.1038/s41567-018-0225-6}, author = {Sakai, Akito and Mizuta, Yo Pierre and Nugroho, Agustinus Agung and Sihombing, Rombang and Koretsune, Takashi and Suzuki, Michi-To and Takemori, Nayuta and Ishii, Rieko and Nishio-Hamane, Daisuke and Arita, Ryotaro and Goswami, Pallab and Nakatsuji, Satoru} } @article { ISI:000433419500002, title = {Magnon-induced non-Markovian friction of a domain wall in a ferromagnet}, journal = {PHYSICAL REVIEW B}, volume = {97}, number = {17}, year = {2018}, month = {MAY 30}, pages = {174433}, issn = {2469-9950}, doi = {10.1103/PhysRevB.97.174433}, author = {Kim, Se Kwon and Tchernyshyov, Oleg and Galitski, Victor and Tserkovnyak, Yaroslav} } @article { ISI:000418043100001, title = {Measuring the dielectric and optical response of millimeter-scale amorphous and hexagonal boron nitride films grown on epitaxial graphene}, journal = {2D MATERIALS}, volume = {5}, number = {1}, year = {2018}, month = {JAN}, pages = {011011}, keywords = {amorphous boron nitride, epitaxial graphene, hexagonal boron nitride, optical dielectric functions}, issn = {2053-1583}, doi = {10.1088/2053-1583/aa9ea3}, author = {Rigosi, Albert F. and Hill, Heather M. and Glavin, Nicholas R. and Pookpanratana, Sujitra J. and Yang, Yanfei and Boosalis, Alexander G. and Hu, Jiuning and Rice, Anthony and Allerman, Andrew A. and Nguyen, Nhan V. and Hacker, Christina A. and Elmquist, Randolph E. and Walker, Angela R. Hight and Newell, David B.} } @article { ISI:000450139700007, title = {Nonlinear sigma model approach to many-body quantum chaos: Regularized and unregularized out-of-time-ordered correlators}, journal = {PHYSICAL REVIEW B}, volume = {98}, number = {20}, year = {2018}, month = {NOV 14}, pages = {205124}, issn = {2469-9950}, doi = {10.1103/PhysRevB.98.205124}, author = {Liao, Yunxiang and Galitski, Victor} } @article { ISI:000451010600006, title = {Nuclear Charge Radii of Th-229 from Isotope and Isomer Shifts}, journal = {PHYSICAL REVIEW LETTERS}, volume = {121}, number = {21}, year = {2018}, month = {NOV 21}, pages = {213001}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.121.213001}, author = {Safronova, M. S. and Porsev, S. G. and Kozlov, M. G. and Thielking, J. and Okhapkin, M. V. and Glowacki, P. and Meier, D. M. and Peik, E.} } @article {ISI:000425116200042, title = {Observation of three-photon bound states in a quantum nonlinear medium}, journal = {SCIENCE}, volume = {359}, number = {6377}, year = {2018}, month = {FEB 16}, pages = {783-786}, publisher = {AMER ASSOC ADVANCEMENT SCIENCE}, type = {Article}, abstract = {Bound states of massive particles, such as nuclei, atoms, or molecules, constitute the bulk of the visible world around us. By contrast, photons typically only interact weakly. We report the observation of traveling three-photon bound states in a quantum nonlinear medium where the interactions between photons are mediated by atomic Rydberg states. Photon correlation and conditional phase measurements reveal the distinct bunching and phase features associated with three-photon and two-photon bound states. Such photonic trimers and dimers possess shape-preserving wave functions that depend on the constituent photon number. The observed bunching and strongly nonlinear optical phase are described by an effective field theory of Rydberg-induced photon-photon interactions. These observations demonstrate the ability to realize and control strongly interacting quantum many-body states of light.}, \%Address = {1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA}, issn = {0036-8075}, doi = {10.1126/science.aao7293}, author = {Liang, Qi-Yu and Venkatramani, Aditya V. and Cantu, Sergio H. and Nicholson, Travis L. and Gullans, Michael J. and Gorshkov, Alexey V. and Thompson, Jeff D. and Chin, Cheng and Lukin, Mikhail D. and Vuletic, Vladan} } @article { ISI:000447918000006, title = {Odd-frequency pairing in the edge states of superconducting pnictides in the coexistence phase with antiferromagnetism}, journal = {PHYSICAL REVIEW B}, volume = {98}, number = {14}, year = {2018}, month = {OCT 22}, pages = {144517}, issn = {2469-9950}, doi = {10.1103/PhysRevB.98.144517}, author = {Youmans, Cody and Ghazaryan, Areg and Kargarian, Mehdi and Ghaemi, Pouyan} } @article { ISI:000447301700001, title = {Optical control over bulk excitations in fractional quantum Hall systems}, journal = {PHYSICAL REVIEW B}, volume = {98}, number = {15}, year = {2018}, month = {OCT 15}, pages = {155124}, issn = {2469-9950}, doi = {10.1103/PhysRevB.98.155124}, author = {Grass, Tobias and Gullans, Michael and Bienias, Przemyslaw and Zhu, Guanyu and Ghazaryan, Areg and Ghaemi, Pouyan and Hafezi, Mohammad} } @article {ISI:000430543700006, title = {Optimal and secure measurement protocols for quantum sensor networks}, journal = {PHYSICAL REVIEW A}, volume = {97}, number = {4}, year = {2018}, month = {APR 23}, pages = {042337}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Studies of quantum metrology have shown that the use of many-body entangled states can lead to an enhancement in sensitivity when compared with unentangled states. In this paper, we quantify the metrological advantage of entanglement in a setting where the measured quantity is a linear function of parameters individually coupled to each qubit. We first generalize the Heisenberg limit to the measurement of nonlocal observables in a quantum network, deriving a bound based on the multiparameter quantum Fisher information. We then propose measurement protocols that can make use of Greenberger-Horne-Zeilinger (GHZ) states or spin-squeezed states and show that in the case of GHZ states the protocol is optimal, i.e., it saturates our bound. We also identify nanoscale magnetic resonance imaging as a promising setting for this technology.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9926}, doi = {10.1103/PhysRevA.97.042337}, author = {Eldredge, Zachary and Foss-Feig, Michael and Gross, Jonathan A. and Rolston, S. L. and Gorshkov, Alexey V.} } @article { ISI:000443327900004, title = {Optimization of photon storage fidelity in ordered atomic arrays}, journal = {NEW JOURNAL OF PHYSICS}, volume = {20}, year = {2018}, month = {AUG 31}, pages = {083048}, keywords = {atomic ensembles, quantum memory, subradiance, superradiance}, issn = {1367-2630}, doi = {10.1088/1367-2630/aadb74}, author = {Manzoni, M. T. and Moreno-Cardoner, M. and Asenjo-Garcia, A. and Porto, J. V. and Gorshkov, A. V. and Chang, D. E.} } @article { ISI:000419549600036, title = {Optimized phase sensing in a truncated SU(1,1) interferometer}, journal = {OPTICS EXPRESS}, volume = {26}, number = {1}, year = {2018}, month = {JAN 8}, pages = {391-401}, issn = {1094-4087}, doi = {10.1364/OE.26.000391}, author = {Gupta, Prasoon and Schmittberger, Bonnie L. and Anderson, Brian E. and Jones, Kevin M. and Lett, Paul D.} } @article {ISI:000430909100001, title = {Out-of-time-order correlators in finite open systems}, journal = {PHYSICAL REVIEW B}, volume = {97}, number = {16}, year = {2018}, month = {APR 26}, pages = {161114}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We study out-of-time-order correlators (OTOCs) of the form <(A) over cap (t) (B) over cap (0) (C) over cap (t) (D) over cap (0)> for a quantum system weakly coupled to a dissipative environment. Such an open system may serve as a model of, e. g., a small region in a disordered interacting medium coupled to the rest of this medium considered as an environment. We demonstrate that for a system with discrete energy levels the OTOC saturates exponentially alpha Sigma a(i)e(-t/tau i) + const to a constant value at t -> infinity, in contrast with quantum-chaotic systemswhich exhibit exponential growth of OTOCs. Focusing on the case of a two-level system, we calculate microscopically the decay times tau(i) and the value of the saturation constant. Because some OTOCs are immune to dephasing processes and some are not, such correlators may decay on two sets of parametrically different time scales related to inelastic transitions between the system levels and to pure dephasing processes, respectively. In the case of a classical environment, the evolution of the OTOC can be mapped onto the evolution of the density matrix of two systems coupled to the same dissipative environment.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9950}, doi = {10.1103/PhysRevB.97.161114}, author = {Syzranov, S. V. and Gorshkov, A. V. and Galitski, V.} } @article {ISI:000427318600005, title = {Photon Subtraction by Many-Body Decoherence}, journal = {PHYSICAL REVIEW LETTERS}, volume = {120}, number = {11}, year = {2018}, month = {MAR 13}, pages = {113601}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We experimentally and theoretically investigate the scattering of a photonic quantum field from another stored in a strongly interacting atomic Rydberg ensemble. Considering the many-body limit of this problem, we derive an exact solution to the scattering-induced spatial decoherence of multiple stored photons, allowing for a rigorous understanding of the underlying dissipative quantum dynamics. Combined with our experiments, this analysis reveals a correlated coherence-protection process in which the scattering from one excitation can shield all others from spatial decoherence. We discuss how this effect can be used to manipulate light at the quantum level, providing a robust mechanism for single-photon subtraction, and experimentally demonstrate this capability.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.120.113601}, author = {Murray, C. R. and Mirgorodskiy, I. and Tresp, C. and Braun, C. and Paris-Mandoki, A. and Gorshkov, A. V. and Hofferberth, S. and Pohl, T.} } @article { ISI:000439279500007, title = {Photon thermalization via laser cooling of atoms}, journal = {PHYSICAL REVIEW A}, volume = {98}, number = {1}, year = {2018}, month = {JUL 19}, pages = {013834}, issn = {2469-9926}, doi = {10.1103/PhysRevA.98.013834}, author = {Wang, Chiao-Hsuan and Gullans, M. J. and Porto, J. V. and Phillips, William D. and Taylor, Jacob M.} } @article {ISI:000423115200014, title = {Probing electron-phonon interactions in the charge-photon dynamics of cavity-coupled double quantum dots}, journal = {PHYSICAL REVIEW B}, volume = {97}, number = {3}, year = {2018}, month = {JAN 16}, pages = {035305}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Electron-phonon coupling is known to play an important role in the charge dynamics of semiconductor quantum dots. Here we explore its role in the combined charge-photon dynamics of cavity-coupled double quantum dots. Previous work on these systems has shown that strong electron-phonon coupling leads to a large contribution to photoemission and gain from phonon-assisted emission and absorption processes. We compare the effects of this phonon sideband in three commonly investigated gate-defined quantum dot material systems: InAs nanowires and GaAs and Si two-dimensional electron gases (2DEGs). We compare our theory with existing experimental data from cavity-coupled InAs nanowire and GaAs 2DEG double quantum dots and find quantitative agreement only when the phonon sideband and photoemission processes during lead tunneling are taken into account. Finally, we show that the phonon sideband also leads to a sizable renormalization of the cavity frequency, which allows for direct spectroscopic probes of the electron-phonon coupling in these systems.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9950}, doi = {10.1103/PhysRevB.97.035305}, author = {Gullans, M. J. and Taylor, J. M. and Petta, J. R.} } @article { ISI:000434633000006, title = {Probing Sizes and Shapes of Nobelium Isotopes by Laser Spectroscopy}, journal = {PHYSICAL REVIEW LETTERS}, volume = {120}, number = {23}, year = {2018}, month = {JUN 8}, pages = {232503}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.120.232503}, author = {Raeder, S. and Ackermann, D. and Backe, H. and Beerwerth, R. and Berengut, J. C. and Block, M. and Borschevsky, A. and Cheal, B. and Chhetri, P. and Duellmann, Ch. E. and Dzuba, V. A. and Eliav, E. and Even, J. and Ferrer, R. and flambaum, v. v. and Fritzsche, S. and Giacoppo, F. and Goetz, S. and Hessberger, F. P. and Huyse, M. and Kaldor, U. and Kaleja, O. and Khuyagbaatar, J. and Kunz, P. and Laatiaoui, M. and Lautenschlager, F. and Lauth, W. and Mistry, A. K. and Ramirez, E. Minaya and Nazarewicz, W. and Porsev, S. G. and Safronova, M. S. and Safronova, U. I. and Schuetrumpf, B. and Van Duppen, P. and Walther, T. and Wraith, C. and Yakushev, A.} } @article {9191, title = {Quantized Majorana conductance}, journal = {Nature}, volume = {Advanced Online Publication}, year = {2018}, month = {03/2018}, url = {http://dx.doi.org/10.1038/nature26142}, author = {Zhang, Hao and Liu, Chun-Xiao and Gazibegovic, Sasa and Xu, Di and Logan, John A. and Wang, Guanzhong and van Loo, Nick and Bommer, Jouri D. S. and de Moor, Michiel W. A. and Car, Diana and Op het Veld, Roy L. M. and van Veldhoven, Petrus J. and Koelling, Sebastian and Verheijen, Marcel A. and Pendharkar, Mihir and Pennachio, Daniel J. and Shojaei, Borzoyeh and Lee, Joon Sue and Palmstr{\o}m, Chris J. and Bakkers, Erik P. A. M. and S. Das Sarma and Kouwenhoven, Leo P.} } @article { ISI:000432019800008, title = {Semiclassical approach to finite-temperature quantum annealing with trapped ions}, journal = {PHYSICAL REVIEW A}, volume = {97}, number = {5}, year = {2018}, month = {MAY 7}, pages = {052310}, issn = {2469-9926}, doi = {10.1103/PhysRevA.97.052310}, author = {Raventos, David and Grass, Tobias and Julia-Diaz, Bruno and Lewenstein, Maciej} } @article {ISI:000419619800004, title = {Spectrum Estimation of Density Operators with Alkaline-Earth Atoms}, journal = {PHYSICAL REVIEW LETTERS}, volume = {120}, number = {2}, year = {2018}, month = {JAN 9}, pages = {025301}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We show that Ramsey spectroscopy of fermionic alkaline-earth atoms in a square-well trap provides an efficient and accurate estimate for the eigenspectrum of a density matrix whose n copies are stored in the nuclear spins of n such atoms. This spectrum estimation is enabled by the high symmetry of the interaction Hamiltonian, dictated, in turn, by the decoupling of the nuclear spin from the electrons and by the shape of the square-well trap. Practical performance of this procedure and its potential applications to quantum computing and time keeping with alkaline-earth atoms are discussed.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.120.025301}, author = {Beverland, Michael E. and Haah, Jeongwan and Alagic, Gorjan and Campbell, Gretchen K. and Rey, Ana Maria and Gorshkov, Alexey V.} } @article { ISI:000453476900018, title = {Spin-Mechanical Coupling of an InAs Quantum Dot Embedded in a Mechanical Resonator}, journal = {PHYSICAL REVIEW LETTERS}, volume = {121}, number = {24}, year = {2018}, month = {DEC 14}, pages = {246801}, abstract = {We demonstrate strain-induced coupling between a hole spin in a quantum dot and mechanical motion of a cantilever. The optical transitions of quantum dots integrated into GaAs mechanical resonators are measured synchronously with the motion of the driven resonators. In a Voigt magnetic field, both electron and hole spin splittings are measured, showing negligible change for the electron spin but a large change for the hole spin of up to 36\%. This large effect is attributed to the stronger spin orbit interaction of holes compared to electrons.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.121.246801}, author = {Carter, S. G. and Bracker, A. S. and Bryant, G. W. and Kim, M. and Kim, C. S. and Zalalutdinov, M. K. and Yakes, M. K. and Czarnocki, C. and Casara, J. and Scheibner, M. and Gammon, D.} } @article { ISI:000441857400004, title = {Spinor Bose-Einstein-condensate phase-sensitive amplifier for SU(1,1) interferometry}, journal = {PHYSICAL REVIEW A}, volume = {98}, number = {2}, year = {2018}, month = {AUG 16}, pages = {023620}, issn = {2469-9926}, doi = {10.1103/PhysRevA.98.023620}, author = {Wrubel, J. P. and Schwettmann, A. and Fahey, D. P. and Glassman, Z. and Pechkis, H. K. and Griffin, P. F. and Barnett, R. and Tiesinga, E. and Lett, P. D.} } @article {10301, title = {A topological source of quantum light}, journal = {Nature}, year = {2018}, url = {https://www.nature.com/articles/s41586-018-0478-3}, author = {S Mittal and Elizabeth A Goldschmidt and Hafezi, Mohammad} } @article { ISI:000445622500049, title = {A topological source of quantum light}, journal = {NATURE}, volume = {561}, number = {7724}, year = {2018}, month = {SEP 27}, pages = {502+}, issn = {0028-0836}, doi = {10.1038/s41586-018-0478-3}, author = {Mittal, Sunil and Goldschmidt, Elizabeth A. and Hafezi, Mohammad} } @article { ISI:000435178200017, title = {Two-frequency operation of a Paul trap to optimise confinement of two species of ions}, journal = {INTERNATIONAL JOURNAL OF MASS SPECTROMETRY}, volume = {430}, year = {2018}, month = {JUL}, pages = {117-125}, keywords = {Ion trap, Multiple frequencies, Parametric heating}, issn = {1387-3806}, doi = {10.1016/j.ijms.2018.05.007}, author = {Foot, C. J. and Trypogeorgos, D. and Bentine, E. and Gardner, A. and Keller, M.} } @article { ISI:000454419500004, title = {Unitary entanglement construction in hierarchical networks}, journal = {PHYSICAL REVIEW A}, volume = {98}, number = {6}, year = {2018}, month = {DEC 26}, pages = {062328}, abstract = {The construction of large-scale quantum computers will require modular architectures that allow physical resources to be localized in easy-to-manage packages. In this work we examine the impact of different graph structures on the preparation of entangled states. We begin by explaining a formal framework, the hierarchical product, in which modular graphs can be easily constructed. This framework naturally leads us to suggest a class of graphs, which we dub hierarchies. We argue that such graphs have favorable properties for quantum information processing, such as a small diameter and small total edge weight, and use the concept of Pareto efficiency to identify promising quantum graph architectures. We present numerical and analytical results on the speed at which large entangled states can be created on nearest-neighbor grids and hierarchy graphs. We also present a scheme for performing circuit placement-the translation from circuit diagrams to machine qubits-on quantum systems whose connectivity is described by hierarchies.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.98.062328}, author = {Bapat, Aniruddha and Eldredge, Zachary and Garrison, James R. and Deshpande, Abhinav and Chong, Frederic T. and Gorshkov, Alexey V.} } @article { ISI:000433032500022, title = {Weyl Semimetal to Metal Phase Transitions Driven by Quasiperiodic Potentials}, journal = {PHYSICAL REVIEW LETTERS}, volume = {120}, number = {20}, year = {2018}, month = {MAY 18}, pages = {207604}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.120.207604}, author = {Pixley, J. H. and Wilson, Justin H. and Huse, David A. and Gopalakrishnan, Sarang} } @article {ISI:000395511400052, title = {Brownian motion of solitons in a Bose-Einstein condensate}, journal = {PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA}, volume = {114}, number = {10}, year = {2017}, month = {MAR 7}, pages = {2503-2508}, abstract = {We observed and controlled the Brownian motion of solitons. We launched solitonic excitations in highly elongated Rb-87 Bose-Einstein condensates (BECs) and showed that a dilute background of impurity atoms in a different internal state dramatically affects the soliton. With no impurities and in one dimension (1D), these solitons would have an infinite lifetime, a consequence of integrability. In our experiment, the added impurities scatter off the much larger soliton, contributing to its Brownian motion and decreasing its lifetime. We describe the soliton{\textquoteright}s diffusive behavior using a quasi-1D scattering theory of impurity atoms interacting with a soliton, giving diffusion coefficients consistent with experiment.

}, issn = {0027-8424}, doi = {10.1073/pnas.1615004114}, author = {Aycock, Lauren M. and Hurst, Hilary M. and Efimkin, Dmitry K. and Genkina, Dina and Lu, Hsin-I and Galitski, Victor M. and Ian B Spielman} } @article { ISI:000405364100004, title = {Chiral anomaly and longitudinal magnetotransport in type-II Weyl semimetals}, journal = {PHYSICAL REVIEW B}, volume = {96}, number = {4}, year = {2017}, month = {JUL 13}, issn = {2469-9950}, doi = {10.1103/PhysRevB.96.045112}, author = {Sharma, Girish and Goswami, Pallab and Tewari, Sumanta} } @article {ISI:000394087200002, title = {Competing orders and topology in the global phase diagram of pyrochlore iridates}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {8}, year = {2017}, month = {FEB 16}, pages = {085120}, abstract = {Strong electronic interactions and spin-orbit coupling can be conducive for realizing novel broken symmetry phases supporting quasiparticles with nontrivial band topology. 227 pyrochlore iridates provide a suitable material platform for studying such emergent phenomena where both topology and competing orders play important roles. In contrast to the most members of this material class, which are thought to display {\textquoteleft}{\textquoteleft}all-in-all-out{{\textquoteright}{\textquoteright}} (AIAO) type magnetically ordered low-temperature insulating ground states, Pr2Ir2O7 remains metallic while exhibiting {\textquoteleft}{\textquoteleft}spin-ice{{\textquoteright}{\textquoteright}} (SI) correlations at low temperatures. Additionally, this is the only 227 iridate compound, which exhibits a large anomalous Hall effect (AHE) along the {[}1,1,1] direction below 1.5 K, without possessing any measurable magnetic moment. By focusing on the normal state of 227 iridates, described by a parabolic semimetal with quadratic band touching, we use renormalization group analysis, mean-field theory, and phenomenological Landau theory as three complementary methods to construct a global phase diagram in the presence of generic local interactions among itinerant electrons of Ir ions. While the global phase diagram supports several competing multipolar orders, motivated by the phenomenology of 227 iridates we particularly emphasize the competition between AIAO and SI orders and how it can cause a mixed phase with {\textquoteleft}{\textquoteleft}three-in-one-out{{\textquoteright}{\textquoteright}} (3I1O) spin configurations. In terms of topological properties of Weyl quasiparticles of the 3I1O state, we provide an explanation for the magnitude and the direction of the observed AHE in Pr2Ir2O7. We propose a strain-induced enhancement of the onset temperature for AHE in thin films of Pr2Ir2O7 and additional experiments for studying competing orders in the vicinity of the metal-insulator transition. In addition to providing a theory for competing orders and magnetic properties of Pr2Ir2O7, the theoretical framework developed in this work should also be useful for a better understanding of competing multipolar orders in other correlated materials.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.085120}, author = {Goswami, Pallab and Roy, Bitan and S. Das Sarma} } @article { ISI:000405197700004, title = {Continuous Symmetry Breaking in 1D Long-Range Interacting Quantum Systems}, journal = {PHYSICAL REVIEW LETTERS}, volume = {119}, number = {2}, year = {2017}, month = {JUL 11}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.119.023001}, author = {Maghrebi, Mohammad F. and Gong, Zhe-Xuan and Gorshkov, Alexey V.} } @article { ISI:000406334600006, title = {Correlated Photon Dynamics in Dissipative Rydberg Media}, journal = {PHYSICAL REVIEW LETTERS}, volume = {119}, number = {4}, year = {2017}, month = {JUL 26}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.119.043602}, author = {Zeuthen, Emil and Gullans, Michael J. and Maghrebi, Mohammad F. and Gorshkov, Alexey V.} } @article {ISI:000404466500004, title = {Dynamic zero modes of Dirac fermions and competing singlet phases of antiferromagnetic order}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {22}, year = {2017}, month = {JUN 30}, pages = {224438}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {In quantum spin systems, singlet phases often develop in the vicinity of an antiferromagnetic order. Typical settings for such problems arise when itinerant fermions are also present. In this paper, we develop a theoretical framework for \%\%Addressing such competing orders in an itinerant system, described by Dirac fermions strongly coupled to an O(3) nonlinear sigma model. We focus on two spatial dimensions, where upon disordering the antiferromagnetic order by quantum fluctuations the singular tunneling events also known as (anti) hedgehogs can nucleate competing singlet orders in the paramagnetic phase. In the presence of an isolated hedgehog configuration of the nonlinear sigma model field, we show that the fermion determinant vanishes as the dynamic Euclidean Dirac operator supports fermion zero modes of definite chirality. This provides a topological mechanism for suppressing the tunneling events. Using the methodology of quantum chromodynamics, we evaluate the fermion determinant in the close proximity of magnetic quantum phase transition, when the antiferromagnetic order-parameter field can be described by a dilute gas of hedgehogs and antihedgehogs. We show how the precise nature of emergent singlet order is determined by the overlap between dynamic fermion zero modes of opposite chirality, localized on the hedgehogs and antihedgehogs. For a Kondo-Heisenberg model on the honeycomb lattice, we demonstrate the competition between spin Peierls order and Kondo singlet formation, thereby elucidating its global phase diagram. We also discuss other physical problems that can be \%\%Addressed within this general framework.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.224438}, author = {Goswami, Pallab and Si, Qimiao} } @article {ISI:000393498700001, title = {Dynamical localization of coupled relativistic kicked rotors}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {6}, year = {2017}, month = {FEB 6}, abstract = {A periodically driven rotor is a prototypical model that exhibits a transition to chaos in the classical regime and dynamical localization (related to Anderson localization) in the quantum regime. In a recent work {[}Phys. Rev. B 94, 085120 (2016)], A. C. Keser et al. considered a many-body generalization of coupled quantum kicked rotors, and showed that in the special integrable linear case, dynamical localization survives interactions. By analogy with many-body localization, the phenomenon was dubbed dynamical many-body localization. In the present work, we study nonintegrable models of single and coupled quantum relativistic kicked rotors (QRKRs) that bridge the gap between the conventional quadratic rotors and the integrable linear models. For a single QRKR, we supplement the recent analysis of the angular-momentum-space dynamics with a study of the spin dynamics. Our analysis of two and three coupled QRKRs along with the proved localization in the many-body linear model indicate that dynamical localization exists in few-body systems. Moreover, the relation between QRKR and linear rotor models implies that dynamical many-body localization can exist in generic, nonintegrable many-body systems. And localization can generally result from a complicated interplay between Anderson mechanism and limiting integrability, since the many-body linear model is a high-angular-momentum limit of many-body QRKRs. We also analyze the dynamics of two coupled QRKRs in the highly unusual superballistic regime and find that the resonance conditions are relaxed due to interactions. Finally, we propose experimental realizations of the QRKR model in cold atoms in optical lattices.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.064303}, author = {Rozenbaum, Efim B. and Galitski, Victor} } @article {ISI:000416947500005, title = {Efimov States of Strongly Interacting Photons}, journal = {PHYSICAL REVIEW LETTERS}, volume = {119}, number = {23}, year = {2017}, month = {DEC 4}, pages = {233601}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We demonstrate the emergence of universal Efimov physics for interacting photons in cold gases of Rydberg atoms. We consider the behavior of three photons injected into the gas in their propagating frame, where a paraxial approximation allows us to consider them as massive particles. In contrast to atoms and nuclei, the photons have a large anisotropy between their longitudinal mass, arising from dispersion, and their transverse mass, arising from diffraction. Nevertheless, we show that, in suitably rescaled coordinates, the effective interactions become dominated by s-wave scattering near threshold and, as a result, give rise to an Efimov effect near unitarity. We show that the three-body loss of these Efimov trimers can be strongly suppressed and determine conditions under which these states are observable in current experiments. These effects can be naturally extended to probe few-body universality beyond three bodies, as well as the role of Efimov physics in the nonequilibrium, many-body regime.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.119.233601}, author = {Gullans, M. J. and Diehl, S. and Rittenhouse, S. T. and Ruzic, B. P. and D{\textquoteright}Incao, J. P. and Julienne, P. and Gorshkov, A. V. and Taylor, J. M.} } @article {ISI:000399783400014, title = {Emergent equilibrium in many-body optical bistability}, journal = {PHYSICAL REVIEW A}, volume = {95}, number = {4}, year = {2017}, month = {APR 17}, abstract = {Many-body systems constructed of quantum-optical building blocks can now be realized in experimental platforms ranging from exciton-polariton fluids to ultracold Rydberg gases, establishing a fascinating interface between traditional many-body physics and the driven-dissipative, nonequilibrium setting of cavity QED. At this interface, the standard techniques and intuitions of both fields are called into question, obscuring issues as fundamental as the role of fluctuations, dimensionality, and symmetry on the nature of collective behavior and phase transitions. Here, we study the driven-dissipative Bose-Hubbard model, a minimal description of numerous atomic, optical, and solid-state systems in which particle loss is countered by coherent driving. Despite being a lattice version of optical bistability, a foundational and patently nonequilibrium model of cavity QED, the steady state possesses an emergent equilibrium description in terms of a classical Ising model. We establish this picture by making new connections between traditional techniques from many-body physics (functional integrals) and quantum optics (the system-size expansion). To lowest order in a controlled expansion-organized around the experimentally relevant limit of weak interactions-the full quantum dynamics reduces to nonequilibrium Langevin equations, which support a phase transition described by model A of the Hohenberg-Halperin classification. Numerical simulations of the Langevin equations corroborate this picture, revealing that canonical behavior associated with the Ising model manifests readily in simple experimental observables.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.95.043826}, author = {Foss-Feig, M. and Niroula, P. and Young, J. T. and Hafezi, M. and Gorshkov, A. V. and Wilson, R. M. and Maghrebi, M. F.} } @article { ISI:000413897900001, title = {Enriched axial anomaly in Weyl materials}, journal = {PHYSICAL REVIEW B}, volume = {96}, number = {16}, year = {2017}, month = {OCT 30}, issn = {2469-9950}, doi = {10.1103/PhysRevB.96.161115}, author = {Raines, Zachary M. and Galitski, Victor M.} } @article { ISI:000406665400001, title = {Entanglement Area Laws for Long-Range Interacting Systems}, journal = {PHYSICAL REVIEW LETTERS}, volume = {119}, number = {5}, year = {2017}, month = {JUL 31}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.119.050501}, author = {Gong, Zhe-Xuan and Foss-Feig, Michael and Brandao, Fernando G. S. L. and Gorshkov, Alexey V.} } @article { ISI:000413668800012, title = {Evidence for magnetic Weyl fermions in a correlated metal}, journal = {NATURE MATERIALS}, volume = {16}, number = {11}, year = {2017}, month = {NOV}, pages = {1090+}, issn = {1476-1122}, doi = {10.1038/NMAT4987}, author = {Kuroda, K. and Tomita, T. and Suzuki, M. -T. and Bareille, C. and Nugroho, A. A. and Goswami, P. and Ochi, M. and Ikhlas, M. and Nakayama, M. and Akebi, S. and Noguchi, R. and Ishii, R. and Inami, N. and Ono, K. and Kumigashira, H. and Varykhalov, A. and Muro, T. and Koretsune, T. and Arita, R. and Shin, S. and Kondo, Takeshi and Nakatsuji, S.} } @article { ISI:000410860100003, title = {Exact sampling hardness of Ising spin models}, journal = {PHYSICAL REVIEW A}, volume = {96}, number = {3}, year = {2017}, month = {SEP 14}, issn = {2469-9926}, doi = {10.1103/PhysRevA.96.032324}, author = {Fefferman, B. and Foss-Feig, M. and Gorshkov, A. V.} } @article {ISI:000400772100005, title = {Exactly soluble model of boundary degeneracy}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {4}, year = {2017}, month = {JAN 25}, abstract = {We investigate the topological degeneracy that can be realized in Abelian fractional quantum spin Hall states with multiply connected gapped boundaries. Such a topological degeneracy (also dubbed as {\textquoteleft}{\textquoteleft}boundary degeneracy{{\textquoteright}{\textquoteright}}) does not require superconducting proximity effect and can be created by simply applying a depletion gate to the quantum spin Hall material and using a generic spin-mixing term (e.g., due to backscattering) to gap out the edge modes. We construct an exactly soluble microscopic model manifesting this topological degeneracy and solve it using the recently developed technique {[}S. Ganeshan and M. Levin, Phys. Rev. B 93, 075118 (2016)]. The corresponding string operators spanning this degeneracy are explicitly calculated. It is argued that the proposed scheme is experimentally reasonable.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.045309}, author = {Ganeshan, Sriram and Gorshkov, Alexey V. and Gurarie, Victor and Galitski, Victor M.} } @article { ISI:000412061700002, title = {Extracting Entanglement Geometry from Quantum States}, journal = {PHYSICAL REVIEW LETTERS}, volume = {119}, number = {14}, year = {2017}, month = {OCT 2}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.119.140502}, author = {Hyatt, Katharine and Garrison, James R. and Bauer, Bela} } @article { ISI:000413663300001, title = {Fast Quantum State Transfer and Entanglement Renormalization Using Long-Range Interactions}, journal = {PHYSICAL REVIEW LETTERS}, volume = {119}, number = {17}, year = {2017}, month = {OCT 25}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.119.170503}, author = {Eldredge, Zachary and Gong, Zhe-Xuan and Young, Jeremy T. and Moosavian, Ali Hamed and Foss-Feig, Michael and Gorshkov, Alexey V.} } @article {7741, title = {Fault-tolerant quantum error detection}, journal = {Science Advances}, volume = {3}, year = {2017}, abstract = {Quantum computers will eventually reach a size at which quantum error correction becomes imperative. Quantum information can be protected from qubit imperfections and flawed control operations by encoding a single logical qubit in multiple physical qubits. This redundancy allows the extraction of error syndromes and the subsequent detection or correction of errors without destroying the logical state itself through direct measurement. We show the encoding and syndrome measurement of a fault-tolerantly prepared logical qubit via an error detection protocol on four physical qubits, represented by trapped atomic ions. This demonstrates the robustness of a logical qubit to imperfections in the very operations used to encode it. The advantage persists in the face of large added error rates and experimental calibration errors.

}, doi = {10.1126/sciadv.1701074}, url = {http://advances.sciencemag.org/content/3/10/e1701074}, author = {Linke, Norbert M. and Gutierrez, Mauricio and Landsman, Kevin A. and Figgatt, Caroline and Debnath, Shantanu and Brown, Kenneth R. and Monroe, Christopher} } @article {ISI:000404469000012, title = {High-order multipole radiation from quantum Hall states in Dirac materials}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {23}, year = {2017}, month = {JUN 30}, pages = {235439}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We investigate the optical response of strongly disordered quantum Hall states in two-dimensional Dirac materials and find qualitatively different effects in the radiation properties of the bulk versus the edge. We show that the far-field radiation from the edge is characterized by large multipole moments (>50) due to the efficient transfer of angular momentum from the electrons into the scattered light. The maximum multipole transition moment is a direct measure of the coherence length of the edge states. Accessing these multipole transitions would provide new tools for optical spectroscopy and control of quantum Hall edge states. On the other hand, the far-field radiation from the bulk appears as random dipole emission with spectral properties that vary with the local disorder potential. We determine the conditions under which this bulk radiation can be used to image the disorder landscape. Such optical measurements can probe submicron-length scales over large areas and provide complementary information to scanning probe techniques. Spatially resolving this bulk radiation would serve as a novel probe of the percolation transition near half filling.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.235439}, author = {Gullans, Michael J. and Taylor, Jacob M. and Imamoglu, Atac and Ghaemi, Pouyan and Hafezi, Mohammad} } @article {ISI:000400662700001, title = {Interacting Weyl fermions: Phases, phase transitions, and global phase diagram}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {20}, year = {2017}, month = {MAY 5}, abstract = {We study the effects of short-range interactions on a generalized three-dimensional Weyl semimetal, where the band touching points act as the (anti) monopoles of Abelian Berry curvature of strength n. We show that any local interaction has a negative scaling dimension -2/n. Consequently, all Weyl semimetals are stable against weak short-range interactions. For sufficiently strong interactions, we demonstrate that the Weyl semimetal either undergoes a first-order transition into a band insulator or a continuous transition into a symmetry breaking phase. A translational symmetry breaking axion insulator and a rotational symmetry breaking semimetal are two prominent candidates for the broken symmetry phase. At the one-loop order, the correlation length exponent for continuous transitions is upsilon = n/2, indicating their non-Gaussian nature for any n > 1. We also discuss the scaling of the thermodynamic and transport quantities in general Weyl semimetals as well as inside broken symmetry phases.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.201102}, author = {Roy, Bitan and Goswami, Pallab and Juricic, Vladimir} } @article {ISI:000400652700006, title = {Kinetic theory of dark solitons with tunable friction}, journal = {PHYSICAL REVIEW A}, volume = {95}, number = {5}, year = {2017}, month = {MAY 3}, abstract = {We study controllable friction in a system consisting of a dark soliton in a one-dimensional Bose-Einstein condensate coupled to a noninteracting Fermi gas. The fermions act as impurity atoms, not part of the original condensate, that scatter off of the soliton. We study semiclassical dynamics of the dark soliton, a particlelike object with negative mass, and calculate its friction coefficient. Surprisingly, it depends periodically on the ratio of interspecies (impurity-condensate) to intraspecies (condensate-condensate) interaction strengths. By tuning this ratio, one can access a regime where the friction coefficient vanishes. We develop a general theory of stochastic dynamics for negative-mass objects and find that their dynamics are drastically different from their positive-mass counterparts: they do not undergo Brownian motion. From the exact phase-space probability distribution function (i.e., in position and velocity), we find that both the trajectory and lifetime of the soliton are altered by friction, and the soliton can undergo Brownian motion only in the presence of friction and a confining potential. These results agree qualitatively with experimental observations by Aycock et al. {[}Proc. Natl. Acad. Sci. USA 114, 2503 (2017)] in a similar system with bosonic impurity scatterers.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.95.053604}, author = {Hurst, Hilary M. and Efimkin, Dmitry K. and Ian B Spielman and Galitski, Victor} } @article { ISI:000416232300009, title = {Lieb-Robinson bounds on n-partite connected correlation functions}, journal = {PHYSICAL REVIEW A}, volume = {96}, number = {5}, year = {2017}, month = {NOV 27}, issn = {2469-9926}, doi = {10.1103/PhysRevA.96.052334}, author = {Tran, Minh Cong and Garrison, James R. and Gong, Zhe-Xuan and Gorshkov, Alexey V.} } @article {8861, title = {Light-Induced Fractional Quantum Hall Phases in Graphene}, journal = {Phys. Rev. Lett.}, volume = {119}, year = {2017}, month = {Dec}, pages = {247403}, doi = {10.1103/PhysRevLett.119.247403}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.119.247403}, author = {Ghazaryan, Areg and Gra{\ss}, Tobias and Gullans, Michael J. and Ghaemi, Pouyan and Hafezi, Mohammad} } @article {6621, title = {Lyapunov Exponent and Out-of-Time-Ordered Correlator{\textquoteright}s Growth Rate in a Chaotic System}, journal = {Phys. Rev. Lett.}, volume = {118}, year = {2017}, month = {Feb}, pages = {086801}, doi = {10.1103/PhysRevLett.118.086801}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.118.086801}, author = {Rozenbaum, Efim B. and Ganeshan, Sriram and Galitski, Victor} } @article {ISI:000404978900007, title = {Many-body localization in incommensurate models with a mobility edge}, journal = {ANNALEN DER PHYSIK}, volume = {529}, number = {7}, year = {2017}, month = {JUL}, pages = {1600399}, publisher = {WILEY-V C H VERLAG GMBH}, type = {Review}, abstract = {We review the physics of many-body localization in models with incommensurate potentials. In particular, we consider one-dimensional quasiperiodic models with single-particle mobility edges. A conventional perspective suggests that delocalized states act as a thermalizing bath for the localized states in the presence of of interactions. However, contrary to this intuition there is evidence that such systems can display non-ergodicity. This is in part due to the fact that the delocalized states do not have any kind of protection due to symmetry or topology and are thus susceptible to localization. A study of such incommensurate models, in the non-interacting limit, shows that they admit extended, partially extended, and fully localized many-body states. Non-interacting incommensurate models cannot thermalize dynamically and remain localized upon the introduction of interactions. In particular, for a certain range of energy, the system can host a non-ergodic extended (i.e. metallic) phase in which the energy eigenstates violate the eigenstate thermalization hypothesis (ETH) but the entanglement entropy obeys volume-law scaling. The level statistics and entanglement growth also indicate the lack of ergodicity in these models. The phenomenon of localization and non-ergodicity in a system with interactions despite the presence of single-particle delocalized states is closely related to the so-called many-body proximity effect and can also be observed in models with disorder coupled to systems with delocalized degrees of freedom. Many-body localization in systems with incommensurate potentials (without single-particle mobility edges) have been realized experimentally, and we show how this can be modified to study the the effects of such mobility edges. Demonstrating the failure of thermalization in the presence of a single-particle mobility edge in the thermodynamic limit would indicate a more robust violation of the ETH.}, \%\%Address = {POSTFACH 101161, 69451 WEINHEIM, GERMANY}, issn = {0003-3804}, doi = {10.1002/andp.201600399}, author = {Deng, Dong-Ling and Ganeshan, Sriram and Li, Xiaopeng and Modak, Ranjan and Mukerjee, Subroto and Pixley, J. H.} } @article {ISI:000404467300002, title = {Metallic phases from disordered (2+1)-dimensional quantum electrodynamics}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {23}, year = {2017}, month = {JUN 26}, pages = {235145}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Metallic phases have been observed in several disordered two-dimensional (2D) systems, including thin films near superconductor-insulator transitions and quantum Hall systems near plateau transitions. The existence of 2D metallic phases at zero temperature generally requires an interplay of disorder and interaction effects. Consequently, experimental observations of 2D metallic behavior have largely defied explanation. We formulate a general stability criterion for strongly interacting, massless Dirac fermions against disorder, which describe metallic ground states with vanishing density of states. We show that (2+1)-dimensional quantum electrodynamics (QED(3)) with a large, even number of fermion flavors remains metallic in the presence of weak scalar potential disorder due to the dynamic screening of disorder by gauge fluctuations. We also show that QED3 with weak mass disorder exhibits a stable, dirty metallic phase in which both interactions and disorder play important roles.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.235145}, author = {Goswami, Pallab and Goldman, Hart and Raghu, S.} } @article { ISI:000406382800003, title = {Methods, analysis, and the treatment of systematic errors for the electron electric dipole moment search in thorium monoxide}, journal = {NEW JOURNAL OF PHYSICS}, volume = {19}, year = {2017}, month = {JUL 25}, issn = {1367-2630}, doi = {10.1088/1367-2630/aa708e}, author = {Baron, J. and Campbell, W. C. and DeMille, D. and Doyle, J. M. and Gabrielse, G. and Gurevich, Y. V. and Hess, P. W. and Hutzler, N. R. and Kirilov, E. and Kozyryev, I. and O{\textquoteright}Leary, B. R. and Panda, C. D. and Parsons, M. F. and Spaun, B. and Vutha, A. C. and West, A. D. and West, E. P. and ACME Collaboration} } @article {ISI:000400050700001, title = {Multicritical behavior in dissipative Ising models}, journal = {PHYSICAL REVIEW A}, volume = {95}, number = {4}, year = {2017}, month = {APR 26}, abstract = {We analyze theoretically the many-body dynamics of a dissipative Ising model in a transverse field using a variational approach. We find that the steady-state phase diagram is substantially modified compared to its equilibrium counterpart, including the appearance of a multicritical point belonging to a different universality class. Building on our variational analysis, we establish a field-theoretical treatment corresponding to a dissipative variant of a Ginzburg-Landau theory, which allows us to compute the upper critical dimension of the system. Finally, we present a possible experimental realization of the dissipative Ising model using ultracold Rydberg gases.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.95.042133}, author = {Overbeck, Vincent R. and Maghrebi, Mohammad F. and Gorshkov, Alexey V. and Weimer, Hendrik} } @article {7821, title = {Observation of a many-body dynamical phase transition with a 53-qubit quantum simulator}, journal = {Nature}, volume = {551}, year = {2017}, chapter = {601}, author = {J Zhang and G Pagano and P. W. Hess and A Kyprianidis and P. Becker and H. Kaplan and A. V. Gorshkov and Gong, Z-X and Christopher Monroe} } @article {7481, title = {Observation of prethermalization in long-range interacting spin chains}, journal = {Science Advances}, volume = {3}, year = {2017}, abstract = {Although statistical mechanics describes thermal equilibrium states, these states may or may not emerge dynamically for a subsystem of an isolated quantum many-body system. For instance, quantum systems that are near-integrable usually fail to thermalize in an experimentally realistic time scale, and instead relax to quasi-stationary prethermal states that can be described by statistical mechanics, when approximately conserved quantities are included in a generalized Gibbs ensemble (GGE). We experimentally study the relaxation dynamics of a chain of up to 22 spins evolving under a long-range transverse-field Ising Hamiltonian following a sudden quench. For sufficiently long-range interactions, the system relaxes to a new type of prethermal state that retains a strong memory of the initial conditions. However, the prethermal state in this case cannot be described by a standard GGE; it rather arises from an emergent double-well potential felt by the spin excitations. This result shows that prethermalization occurs in a broader context than previously thought, and reveals new challenges for a generic understanding of the thermalization of quantum systems, particularly in the presence of long-range interactions.

}, doi = {10.1126/sciadv.1700672}, url = {http://advances.sciencemag.org/content/3/8/e1700672}, author = {Neyenhuis, Brian and Zhang, Jiehang and Hess, Paul W. and Smith, Jacob and Lee, Aaron C. and Richerme, Phil and Gong, Zhe-Xuan and Gorshkov, Alexey V. and Monroe, Christopher} } @inbook {7621, title = {Optical Nanofibers: A New Platform for Quantum Optics}, booktitle = {Advances In Atomic, Molecular, and Optical Physics}, volume = {66}, year = {2017}, pages = {439}, chapter = {7}, author = {Pablo Solano and Grover, J. A. and Jonathan E Hoffman and Sylvain Ravets and Fredrik K Fatemi and Luis A Orozco and Steven L Rolston} } @article {ISI:000404461300009, title = {Optimal phase measurements with bright- and vacuum-seeded SU(1,1) interferometers}, journal = {PHYSICAL REVIEW A}, volume = {95}, number = {6}, year = {2017}, month = {JUN 27}, pages = {063843}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The SU(1,1) interferometer can be thought of as a Mach-Zehnder interferometer with its linear beam splitters replaced with parametric nonlinear optical processes. We consider the cases of bright- and vacuum-seeded SU(1,1) interferometers using intensity or homodyne detectors. A simplified truncated scheme with only one nonlinear interaction is introduced, which not only beats conventional intensity detection with a bright seed, but can saturate the phase-sensitivity bound set by the quantum Fisher information. We also show that the truncated scheme achieves a sub-shot-noise phase sensitivity in the vacuum-seeded case, despite the phase-sensing optical beams having no well-defined phase.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9926}, doi = {10.1103/PhysRevA.95.063843}, author = {Anderson, Brian E. and Schmittberger, Bonnie L. and Gupta, Prasoon and Jones, Kevin M. and Lett, Paul D.} } @article { ISI:000406093300012, title = {Phase sensing beyond the standard quantum limit with a variation on the SU(1,1) interferometer}, journal = {OPTICA}, volume = {4}, number = {7}, year = {2017}, month = {JUL 20}, pages = {752-756}, issn = {2334-2536}, doi = {10.1364/OPTICA.4.000752}, author = {Anderson, Brian E. and Gupta, Prasoon and Schmittberger, Bonnie L. and Horrom, Travis and Hermann-Avigliano, Carla and Jones, Kevin M. and Lett, Paul D.} } @article {7271, title = {Quantum correlations from a room-temperature optomechanical cavity}, journal = {Science}, volume = {356}, year = {2017}, pages = {1265{\textendash}1268}, abstract = {Quantum back action{\textemdash}the {\textquotedblleft}reaction{\textquotedblright} of a quantum mechanical object to being measured{\textemdash}is normally observed at cryogenic temperatures, where it is easier to distinguish from thermal motion. Purdy et al. managed to tease out the effects of quantum back action at room temperature by using a mechanical oscillator and probing it with light (see the Perspective by Harris). The fluctuations of the force produced by the light probe caused correlated changes to the motion of the oscillator and the properties of the transmitted light. These correlations revealed the effects of the back action, which allows the system to be used as a quantum thermometer.Science, this issue p. 1265; see also p. 1232The act of position measurement alters the motion of an object being measured. This quantum measurement backaction is typically much smaller than the thermal motion of a room-temperature object and thus difficult to observe. By shining laser light through a nanomechanical beam, we measure the beam{\textquoteright}s thermally driven vibrations and perturb its motion with optical force fluctuations at a level dictated by the Heisenberg measurement-disturbance uncertainty relation. We demonstrate a cross-correlation technique to distinguish optically driven motion from thermally driven motion, observing this quantum backaction signature up to room temperature. We use the scale of the quantum correlations, which is determined by fundamental constants, to gauge the size of thermal motion, demonstrating a path toward absolute thermometry with quantum mechanically calibrated ticks.

}, issn = {0036-8075}, doi = {10.1126/science.aag1407}, url = {http://science.sciencemag.org/content/356/6344/1265}, author = {Purdy, T. P. and Grutter, K. E. and Srinivasan, K. and Taylor, J. M.} } @article {ISI:000396518400037, title = {Quantum frequency bridge: high-accuracy characterization of a nearly-noiseless parametric frequency converter}, journal = {OPTICS EXPRESS}, volume = {25}, number = {2}, year = {2017}, month = {JAN 23}, pages = {907-917}, abstract = {We demonstrate an efficient and inherently ultra-low noise frequency conversion via a parametric sum frequency generation. Due to the wide separation between the input and pump frequencies and the low pump frequency relative to the input photons, the upconversion results in only approximate to 100 background photons per hour. To measure such a low rate, we introduced a dark count reduction algorithm for an optical transition edge sensor. (C) 2017 Optical Society of America}, issn = {1094-4087}, doi = {10.1364/OE.25.000907}, author = {Burenkov, Ivan A. and Gerrits, Thomas and Lita, Adriana and Nam, Sae Woo and Shalm, L. Krister and Polyakov, Sergey V.} } @article {ISI:000418786600007, title = {Quantum Redirection of Antenna Absorption to Photosynthetic Reaction Centers}, journal = {JOURNAL OF PHYSICAL CHEMISTRY LETTERS}, volume = {8}, number = {24}, year = {2017}, month = {DEC 21}, pages = {6015-6021}, publisher = {AMER CHEMICAL SOC}, type = {Article}, abstract = {The early steps of photosynthesis involve the photoexcitation of reaction centers (RCs) and light-harvesting (LH) units. Here, we show that the historically overlooked excitonic delocalization across RC and LH pigments results in a redistribution of absorption amplitudes that benefits the absorption cross section of the optical bands associated with the RC of several species. While we prove that this redistribution is robust to the microscopic details of the dephasing between these units in the purple bacterium Rhodospirillum rubrum, we are able to show that the redistribution witnesses a more fragile, but persistent, coherent population dynamics which directs excitations from the LH toward the RC units under incoherent illumination and physiological conditions. Even though the redirection does not seem to affect importantly the overall efficiency in photosynthesis, stochastic optimization allows us to delineate clear guidelines and develop simple analytic expressions in order to amplify the coherent redirection in artificial nanostructures.}, \%\%Address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, issn = {1948-7185}, doi = {10.1021/acs.jpclett.7b02714}, author = {Caycedo-Soler, Felipe and Schroeder, Christopher A. and Autenrieth, Caroline and Pick, Arne and Ghosh, Robin and Huelga, Susana F. and Plenio, Martin B.} } @article { ISI:000411973900008, title = {Rydberg optical Feshbach resonances in cold gases}, journal = {PHYSICAL REVIEW A}, volume = {96}, number = {3}, year = {2017}, month = {SEP 28}, issn = {2469-9926}, doi = {10.1103/PhysRevA.96.032719}, author = {Sandor, Nora and Gonzalez-Ferez, Rosario and Julienne, Paul S. and Pupillo, Guido} } @article { ISI:000415173000002, title = {Simultaneous, Full Characterization of a Single-Photon State}, journal = {PHYSICAL REVIEW X}, volume = {7}, number = {4}, year = {2017}, month = {NOV 15}, issn = {2160-3308}, doi = {10.1103/PhysRevX.7.041036}, author = {Thomay, Tim and Polyakov, Sergey V. and Gazzano, Olivier and Goldschmidt, Elizabeth and Eldredge, Zachary D. and Huber, Tobias and Loo, Vivien and Solomon, Glenn S.} } @article {ISI:000402467200001, title = {Single-particle excitations in disordered Weyl fluids}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {23}, year = {2017}, month = {JUN 1}, pages = {235101}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We theoretically study the single-particle Green function of a three-dimensional disordered Weyl semimetal using a combination of techniques. These include analytic T-matrix and renormalization group methods with complementary regimes of validity and an exact numerical approach based on the kernel polynomial technique. We show that at any nonzero disorder, Weyl excitations are not ballistic: They instead have a nonzero linewidth that for weak short-range disorder arises from nonperturbative resonant impurity scattering. Perturbative approaches find a quantum critical point between a semimetal and a metal at a finite disorder strength, but this transition is avoided due to nonperturbative effects. At moderate disorder strength and intermediate energies the avoided quantum critical point renormalizes the scaling of single-particle properties. In this regime we compute numerically the anomalous dimension of the fermion field and find eta = 0.13 +/- 0.04, which agrees well with a renormalization group analysis (eta = 0.125). Our predictions can be directly tested by ARPES and STM measurements in samples dominated by neutral impurities.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.235101}, author = {Pixley, J. H. and Chou, Yang-Zhi and Goswami, Pallab and Huse, David A. and Nandkishore, Rahul and Radzihovsky, Leo and S. Das Sarma} } @article { ISI:000408826800004, title = {Skyrmion defects and competing singlet orders in a half-filled antiferromagnetic Kondo-Heisenberg model on the honeycomb lattice}, journal = {PHYSICAL REVIEW B}, volume = {96}, number = {12}, year = {2017}, month = {SEP 1}, issn = {2469-9950}, doi = {10.1103/PhysRevB.96.125101}, author = {Liu, Chia-Chuan and Goswami, Pallab and Si, Qimiao} } @article { ISI:000414424700002, title = {Solvable Family of Driven-Dissipative Many-Body Systems}, journal = {PHYSICAL REVIEW LETTERS}, volume = {119}, number = {19}, year = {2017}, month = {NOV 6}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.119.190402}, author = {Foss-Feig, Michael and Young, Jeremy T. and Albert, Victor V. and Gorshkov, Alexey V. and Maghrebi, Mohammad F.} } @article { ISI:000414951500015, title = {Spontaneous avalanche dephasing in large Rydberg ensembles}, journal = {PHYSICAL REVIEW A}, volume = {96}, number = {5}, year = {2017}, month = {NOV 13}, issn = {2469-9926}, doi = {10.1103/PhysRevA.96.053409}, author = {Boulier, T. and Magnan, E. and Bracamontes, C. and Maslek, J. and Goldschmidt, E. A. and Young, J. T. and Gorshkov, A. V. and Rolston, S. L. and Porto, J. V.} } @article { ISI:000411880800029, title = {Storing light in a tiny box A cavity containing rare-earth atoms in a glass stores light pulses for quantum memories}, journal = {SCIENCE}, volume = {357}, number = {6358}, year = {2017}, month = {SEP 29}, pages = {1354-1355}, issn = {0036-8075}, doi = {10.1126/science.aao2437}, author = {Waks, Edo and Goldschmidt, Elizabeth A.} } @article {ISI:000394086900002, title = {Superuniversality of topological quantum phase transition and global phase diagram of dirty topological systems in three dimensions}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {7}, year = {2017}, month = {FEB 16}, pages = {075131}, abstract = {The quantum phase transition between two clean, noninteracting topologically distinct gapped states in three dimensions is governed by a massless Dirac fermion fixed point, irrespective of the underlying symmetry class, and this constitutes a remarkably simple example of superuniversality. For a sufficiently weak disorder strength, we show that the massless Dirac fixed point is at the heart of the robustness of superuniversality. We establish this by considering both perturbative and nonperturbative effects of disorder. The superuniversality breaks down at a critical strength of disorder, beyond which the topologically distinct localized phases become separated by a delocalized diffusive phase. In the global phase diagram, the disorder controlled fixed point where superuniversality is lost, serves as a multicritical point, where the delocalized diffusive and two topologically distinct localized phases meet and the nature of the localization-delocalization transition depends on the underlying symmetry class. Based on these features, we construct the global phase diagrams of noninteracting, dirty topological systems in three dimensions. We also establish a similar structure of the phase diagram and the superuniversality for weak disorder in higher spatial dimensions. By noting that 1/r(2) power-law correlated disorder acts as a marginal perturbation for massless Dirac fermions in any spatial dimension d, we have established a general renormalization group framework for addressing disorder driven critical phenomena for fixed spatial dimension d > 2.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.075131}, author = {Goswami, Pallab and Chakravarty, Sudip} } @article {7146, title = {Surface-dominated conduction up to 240K in the Kondo insulator SmB6 under strain}, journal = {Nature Materials}, volume = {advance online publication}, year = {2017}, month = {04/2017}, pages = {{\textendash}}, isbn = {1476-4660}, url = {http://dx.doi.org/10.1038/nmat4888}, author = {Stern, A. and Dzero, M. and Galitski, V. M. and Fisk, Z. and Xia, J.} } @article { ISI:000412247200006, title = {Temporal and spectral manipulations of correlated photons using a time lens}, journal = {PHYSICAL REVIEW A}, volume = {96}, number = {4}, year = {2017}, month = {OCT 4}, issn = {2469-9926}, doi = {10.1103/PhysRevA.96.043807}, author = {Mittal, Sunil and Orre, Venkata Vikram and Restelli, Alessandro and Salem, Reza and Goldschmidt, Elizabeth A. and Hafezi, Mohammad} } @article { ISI:000408705200026, title = {Threshold Dynamics of a Semiconductor Single Atom Maser}, journal = {PHYSICAL REVIEW LETTERS}, volume = {119}, number = {9}, year = {2017}, month = {AUG 31}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.119.097702}, author = {Liu, Y. -Y. and Stehlik, J. and Eichler, C. and Mi, X. and Hartke, T. R. and Gullans, M. J. and Taylor, J. M. and Petta, J. R.} } @article {7261, title = {Time-reversal symmetry-breaking superconductivity in epitaxial bismuth/nickel bilayers}, journal = {Science Advances}, volume = {3}, year = {2017}, abstract = {Superconductivity that spontaneously breaks time-reversal symmetry (TRS) has been found, so far, only in a handful of three-dimensional (3D) crystals with bulk inversion symmetry. We report an observation of spontaneous TRS breaking in a 2D superconducting system without inversion symmetry: the epitaxial bilayer films of bismuth and nickel. The evidence comes from the onset of the polar Kerr effect at the superconducting transition in the absence of an external magnetic field, detected by the ultrasensitive loop-less fiber-optic Sagnac interferometer. Because of strong spin-orbit interaction and lack of inversion symmetry in a Bi/Ni bilayer, superconducting pairing cannot be classified as singlet or triplet. We propose a theoretical model where magnetic fluctuations in Ni induce the superconducting pairing of the orbital symmetry between the electrons in Bi. In this model, the order parameter spontaneously breaks the TRS and has a nonzero phase winding number around the Fermi surface, thus making it a rare example of a 2D topological superconductor.

}, doi = {10.1126/sciadv.1602579}, url = {http://advances.sciencemag.org/content/3/3/e1602579}, author = {Gong, Xinxin and Kargarian, Mehdi and Stern, Alex and Yue, Di and Zhou, Hexin and Jin, Xiaofeng and Galitski, Victor M. and Yakovenko, Victor M. and Xia, Jing} } @article {ISI:000396271900006, title = {Topological spin ordering via Chern-Simons superconductivity}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {9}, year = {2017}, month = {MAR 15}, pages = {094511}, abstract = {We use the Chern-Simons (CS) fermion representation of s = 1/2 spin operators to construct topological, long-range magnetically ordered states of interacting two-dimensional (2D) quantum spin models. We show that the fermion-fermion interactions mediated by the dynamic CS flux attachment may give rise to Cooper pairing of the fermions. Specifically, in an XY model on the honeycomb lattice, this construction leads to a {\textquoteleft}{\textquoteleft}CS superconductor{{\textquoteright}{\textquoteright}}, which belongs to a topologically nontrivial in 2D symmetry class DIII, with particle-hole and time-reversal symmetries. It is shown that in the original spin language, this state corresponds to a symmetry protected topological state, which coexists with a magnetic long-range order. We discuss physical manifestations of the topological character of the corresponding state.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.094511}, author = {Sedrakyan, Tigran A. and Galitski, Victor M. and Kamenev, Alex} } @article { ISI:000414956700009, title = {Valley blockade in a silicon double quantum dot}, journal = {PHYSICAL REVIEW B}, volume = {96}, number = {20}, year = {2017}, month = {NOV 13}, issn = {2469-9950}, doi = {10.1103/PhysRevB.96.205302}, author = {Perron, Justin K. and Gullans, Michael J. and Taylor, Jacob M. and Stewart, Jr., M. D. and Zimmerman, Neil M.} } @article { ISI:000381478800008, title = {Amperean Pairing at the Surface of Topological Insulators}, journal = {PHYSICAL REVIEW LETTERS}, volume = {117}, number = {7}, year = {2016}, month = {AUG 12}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.117.076806}, author = {Kargarian, Mehdi and Efimkin, Dmitry K. and Galitski, Victor} } @article {4380, title = {Anomalous broadening in driven dissipative Rydberg systems}, journal = {Phys. Rev. Lett.}, volume = {116}, year = {2016}, month = {03/2016}, pages = {113001}, abstract = {We observe interaction-induced broadening of the two-photon 5s-18s transition in 87Rb atoms trapped in a 3D optical lattice. The measured linewidth increases by nearly two orders of magnitude with increasing atomic density and excitation strength, with corresponding suppression of resonant scattering and enhancement of off-resonant scattering. We attribute the increased linewidth to resonant dipole-dipole interactions of 18s atoms with blackbody induced population in nearby np states. Over a range of initial atomic densities and excitation strengths, the transition width is described by a single function of the steady-state density of Rydberg atoms, and the observed resonant excitation rate corresponds to that of a two-level system with the measured, rather than natural, linewidth. The broadening mechanism observed here is likely to have negative implications for many proposals with coherently interacting Rydberg atoms.

}, doi = {10.1103/PhysRevLett.116.113001}, author = {Goldschmidt, E A and Boulier, T and Brown, R C and Koller, S B and Young, J T and Gorshkov, A V and Rolston, S L and Porto, J V} } @article { ISI:000369337200015, title = {Anomalous Coulomb Drag in Electron-Hole Bilayers due to the Formation of Excitons}, journal = {PHYSICAL REVIEW LETTERS}, volume = {116}, number = {4}, year = {2016}, month = {JAN 26}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.116.046801}, author = {Efimkin, Dmitry K. and Galitski, Victor} } @article { ISI:000371398000004, title = {Calculation for polar Kerr effect in high-temperature cuprate superconductors}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {7}, year = {2016}, month = {FEB 29}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.075156}, author = {Sharma, Girish and Tewari, Sumanta and Goswami, Pallab and Yakovenko, Victor M. and Chakravarty, Sudip} } @article {ISI:000372413300003, title = {Causality and quantum criticality in long-range lattice models}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {12}, year = {2016}, month = {MAR 17}, pages = {125128}, chapter = {125128}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.125128}, author = {Maghrebi, Mohammad F. and Gong, Zhe-Xuan and Foss-Feig, Michael and Gorshkov, Alexey V.} } @article {ISI:000382794600007, title = {Collective phases of strongly interacting cavity photons}, journal = {PHYSICAL REVIEW A}, volume = {94}, number = {3}, year = {2016}, month = {SEP 1}, pages = {033801}, issn = {2469-9926}, doi = {10.1103/PhysRevA.94.033801}, author = {Wilson, Ryan M. and Mahmud, Khan W. and Hu, Anzi and Gorshkov, Alexey V. and Hafezi, Mohammad and Foss-Feig, Michael} } @article { ISI:000378910200001, title = {Continuous and discontinuous topological quantum phase transitions}, journal = {PHYSICAL REVIEW B}, volume = {94}, number = {4}, year = {2016}, month = {JUL 1}, pages = {041101}, issn = {2469-9950}, doi = {10.1103/PhysRevB.94.041101}, author = {Roy, Bitan and Goswami, Pallab and Sau, Jay D.} } @article {ISI:000369402400006, title = {Disorder-driven itinerant quantum criticality of three-dimensional massless Dirac fermions}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {8}, year = {2016}, month = {FEB 1}, pages = {085103}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.085103}, author = {Pixley, J. H. and Goswami, Pallab and S. Das Sarma} } @article {4424, title = {Doublon dynamics and polar molecule production in an optical lattice}, journal = {Nature Communications}, volume = {7}, year = {2016}, month = {04/2016}, pages = {11279}, doi = {10.1038/ncomms11279}, author = {Covey, Jacob P and Moses, Stephen A and G{\"a}rttner, Martin and Safavi-Naini, Arghavan and Miecnikowski, Matthew T and Fu, Zhengkun and Schachenmayer, Johannes and Julienne, Paul S and Rey, Ana M. and Jin, Deborah S and Ye, Jun} } @article { ISI:000381399500005, title = {Dynamical many-body localization in an integrable model}, journal = {PHYSICAL REVIEW B}, volume = {94}, number = {8}, year = {2016}, month = {AUG 11}, pages = {085120}, issn = {2469-9950}, doi = {10.1103/PhysRevB.94.085120}, author = {Keser, Aydin Cem and Ganeshan, Sriram and Refael, Gil and Galitski, Victor} } @article {ISI:000383248700006, title = {Effective Field Theory for Rydberg Polaritons}, journal = {PHYSICAL REVIEW LETTERS}, volume = {117}, number = {11}, year = {2016}, month = {SEP 6}, pages = {113601}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.117.113601}, author = {Gullans, M. J. and Thompson, J. D. and Wang, Y. and Liang, Q. -Y. and Vuletic, V. and Lukin, M. D. and Gorshkov, A. V.} } @article { ISI:000369727700005, title = {Formalism for the solution of quadratic Hamiltonians with large cosine terms}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {7}, year = {2016}, month = {FEB 8}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.075118}, author = {Ganeshan, Sriram and Levin, Michael} } @article {4468, title = {Geometrical Pumping with a Bose-Einstein Condensate}, journal = {Phys. Rev. Lett.}, volume = {116}, year = {2016}, month = {05/2016}, pages = {200402}, abstract = {We realized a quantum geometric {\textquotedblleft}charge{\textquotedblright} pump for a Bose-Einstein condensate (BEC) in the lowest Bloch band of a novel bipartite magnetic lattice. Topological charge pumps in filled bands yield quantized pumping set by the global{\textemdash}topological{\textemdash}properties of the bands. In contrast, our geometric charge pump for a BEC occupying just a single crystal momentum state exhibits nonquantized charge pumping set by local{\textemdash}geometrical{\textemdash}properties of the band structure. Like topological charge pumps, for each pump cycle we observed an overall displacement (here, not quantized) and a temporal modulation of the atomic wave packet{\textquoteright}s position in each unit cell, i.e., the polarization.

}, doi = {10.1103/PhysRevLett.116.200402}, url = {http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.200402}, author = {Lu, H and Schemmer, M and Aycock, L M and Genkina, D and Sugawa, S and Ian B Spielman} } @article { ISI:000373117500001, title = {Interplanar coupling-dependent magnetoresistivity in high-purity layered metals}, journal = {NATURE COMMUNICATIONS}, volume = {7}, year = {2016}, month = {MAR}, issn = {2041-1723}, doi = {10.1038/ncomms10903}, author = {Kikugawa, N. and Goswami, P. and Kiswandhi, A. and Choi, E. S. and Graf, D. and Baumbach, R. E. and Brooks, J. S. and Sugii, K. and Iida, Y. and Nishio, M. and Uji, S. and Terashima, T. and Rourke, P. M. C. and Hussey, N. E. and Takatsu, H. and Yonezawa, S. and Maeno, Y. and Balicas, L.} } @article { ISI:000375997100002, title = {Kaleidoscope of quantum phases in a long-range interacting spin-1 chain}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {20}, year = {2016}, month = {MAY 11}, pages = {205115}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.205115}, author = {Gong, Z. -X. and Maghrebi, M. F. and Hu, A. and Foss-Feig, M. and Richerme, P. and Monroe, C. and Gorshkov, A. V.} } @article {ISI:000385514800001, title = {Many-body decoherence dynamics and optimized operation of a single-photon switch}, journal = {NEW JOURNAL OF PHYSICS}, volume = {18}, year = {2016}, month = {SEP 13}, pages = {092001}, abstract = {Wedevelop a theoretical framework to characterize the decoherence dynamics due to multi-photon scattering in an all-optical switch based on Rydberg atom induced nonlinearities. By incorporating the knowledge of this decoherence process into optimal photon storage and retrieval strategies, we establish optimized switching protocols for experimentally relevant conditions, and evaluate the corresponding limits in the achievable fidelities. Based on these results we work out a simplified description that reproduces recent experiments (Nat. Commun. 7 12480) and provides a new interpretation in terms of many-body decoherence involving multiple incident photons and multiple gate excitations forming the switch. Aside from offering insights into the operational capacity of realistic photon switching capabilities, our work provides a complete description of spin wave decoherence in a Rydberg quantum optics setting, and has immediate relevance to a number of further applications employing photon storage in Rydberg media.}, issn = {1367-2630}, doi = {10.1088/1367-2630/18/9/092001}, author = {Murray, C. R. and Gorshkov, A. V. and Pohl, T.} } @article {ISI:000390255800002, title = {Measurement of many-body chaos using a quantum clock}, journal = {PHYSICAL REVIEW A}, volume = {94}, number = {6}, year = {2016}, month = {DEC 22}, pages = {062329}, abstract = {There has been recent progress in understanding chaotic features in many-body quantum systems. Motivated by the scrambling of information in black holes, it has been suggested that the time dependence of out-of-time-ordered (OTO) correlation functions such as < O-2(t)O-1(0)O-2(t)O-1(0)> is a faithful measure of quantum chaos. Experimentally, these correlators are challenging to access since they apparently require access to both forward and backward time evolution with the system Hamiltonian. Here we propose a protocol to measure such OTO correlators using an ancilla that controls the direction of time. Specifically, by coupling the state of the ancilla to the system Hamiltonian of interest, we can emulate the forward and backward time propagation, where the ancilla plays the role of a quantum clock. Within this scheme, the continuous evolution of the entire system (the system of interest and the ancilla) is governed by a time-independent Hamiltonian. We discuss the implementation of our protocol with current circuit-QED technology for a class of interacting Hamiltonians. Our protocol is immune to errors that could occur when the direction of time evolution is externally controlled by a classical switch.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.94.062329}, author = {Zhu, Guanyu and Hafezi, Mohammad and Grover, Tarun} } @article {4175, title = {Measurement of Topological Invariants in a 2D Photonic System}, journal = {Nature Photonics}, volume = {10}, year = {2016}, month = {02/2016}, pages = {180}, doi = {10.1038/nphoton.2016.10}, url = {http://www.nature.com/nphoton/journal/v10/n3/full/nphoton.2016.10.html}, author = {S Mittal and Ganeshan, S and Jingyun Fan and A Vaezi and Mohammad Hafezi} } @article { ISI:000367162300001, title = {Multi-channel entanglement distribution using spatial multiplexing from four-wave mixing in atomic vapor}, journal = {JOURNAL OF MODERN OPTICS}, volume = {63}, number = {3}, year = {2016}, pages = {185-189}, issn = {0950-0340}, doi = {10.1080/09500340.2015.1071891}, author = {Gupta, Prasoon and Horrom, Travis and Anderson, Brian E. and Glasser, Ryan and Lett, Paul D.} } @article { ISI:000368295000003, title = {Nernst and magnetothermal conductivity in a lattice model of Weyl fermions}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {3}, year = {2016}, month = {JAN 13}, issn = {1098-0121}, doi = {10.1103/PhysRevB.93.035116}, author = {Sharma, Girish and Goswami, Pallab and Tewari, Sumanta} } @article { ISI:000372432300003, title = {Noise Suppression Using Symmetric Exchange Gates in Spin Qubits}, journal = {PHYSICAL REVIEW LETTERS}, volume = {116}, number = {11}, year = {2016}, month = {MAR 16}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.116.116801}, author = {Martins, Frederico and Malinowski, Filip K. and Nissen, Peter D. and Barnes, Edwin and Fallahi, Saeed and Gardner, Geoffrey C. and Manfra, Michael J. and Marcus, Charles M. and Kuemmeth, Ferdinand} } @article { ISI:000369216400001, title = {Nonequilibrium many-body steady states via Keldysh formalism}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {1}, year = {2016}, month = {JAN 27}, pages = {014307}, chapter = {014307}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.014307}, author = {Maghrebi, Mohammad F. and Gorshkov, Alexey V.} } @article {14296, title = {Nonlinear looped band structure of Bose-Einstein condensates in an optical lattice}, journal = {Phys. Rev. A}, volume = {94}, year = {2016}, pages = {063634}, author = {Koller, Silvio B and Goldschmidt, Elizabeth A and Brown, Roger C and Wyllie, Robert and Wilson, Ryan W and Porto, J V} } @article {4655, title = {Non-Markovian Quantum Friction of Bright Solitons in Superfluids}, journal = {Phys. Rev. Lett.}, volume = {116}, year = {2016}, month = {05/2016}, pages = {225301}, doi = {10.1103/PhysRevLett.116.225301}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.116.225301}, author = {Efimkin, Dmitry K. and Hofmann, Johannes and Galitski, Victor} } @article { ISI:000377796000001, title = {Parity effect in a mesoscopic Fermi gas}, journal = {PHYSICAL REVIEW A}, volume = {93}, number = {6}, year = {2016}, month = {JUN 13}, pages = {061602}, issn = {2469-9926}, doi = {10.1103/PhysRevA.93.061602}, author = {Hofmann, Johannes and Lobos, Alejandro M. and Galitski, Victor} } @article {6431, title = {Proximity effects in cold atom artificial graphene}, journal = {2D Materials}, volume = {4}, year = {2016}, month = {12/2016}, abstract = {Cold atoms in an optical lattice with brick-wall geometry have been used to mimic graphene, a two-dimensional material with characteristic Dirac excitations. Here we propose to bring such artificial graphene into the proximity of a second atomic layer with a square lattice geometry. For non-interacting fermions, we find that such bilayer system undergoes a phase transition from a graphene-like semi-metal phase, characterized by a band structure with Dirac points, to a gapped band insulator phase. In the presence of attractive interactions between fermions with pseudospin-1/2 degree of freedom, a competition between semi-metal and superfluid behavior is found at the mean-field level. Using the quantum Monte Carlo method, we also investigate the case of strong repulsive interactions. In the Mott phase, each layer exhibits a different amount of long-range magnetic order. Upon coupling both layers, a valence-bond crystal is formed at a critical coupling strength. Finally, we discuss how these bilayer systems could be realized in existing cold atom experiments.

}, doi = {10.1088/2053-1583/aa50c6}, url = {http://iopscience.iop.org/article/10.1088/2053-1583/aa50c6/meta;jsessionid=D34C5DE028C6A9A2A9B6D6A0A65569AF.c2.iopscience.cld.iop.org}, author = {Tobias Grass and Ravindra W Chhajlany and Leticia Tarruell and Vittorio Pellegrini and Maciej Lewenstein} } @article { ISI:000376908700003, title = {Quantum nonergodicity and fermion localization in a system with a single-particle mobility edge}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {18}, year = {2016}, month = {MAY 31}, pages = {184204}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.184204}, author = {Li, Xiaopeng and Pixley, J. H. and Deng, Dong-Ling and Ganeshan, Sriram and S. Das Sarma} } @article {4416, title = {Radio Frequency Tunable Oscillator Device Based on a SmB6 Microcrystal}, journal = {Phys. Rev. Lett.}, volume = {116}, year = {2016}, month = {04/2016}, pages = {166603}, doi = {10.1103/PhysRevLett.116.166603}, author = {Stern, Alex and Efimkin, Dmitry K. and Galitski, Victor and Fisk, Zachary and Xia, Jing} } @article {ISI:000375524900002, title = {Realizing exactly solvable SU(N) magnets with thermal atoms}, journal = {PHYSICAL REVIEW A}, volume = {93}, number = {5}, year = {2016}, month = {MAY 6}, pages = {051601}, issn = {2469-9926}, doi = {10.1103/PhysRevA.93.051601}, author = {Beverland, Michael E. and Alagic, Gorjan and Martin, Michael J. and Koller, Andrew P. and Rey, Ana M. and Gorshkov, Alexey V.} } @article {ISI:000388814500011, title = {Self-organization of atoms coupled to a chiral reservoir}, journal = {PHYSICAL REVIEW A}, volume = {94}, number = {5}, year = {2016}, month = {NOV 29}, pages = {053855}, abstract = {Tightly confined modes of light, as in optical nanofibers or photonic crystal waveguides, can lead to large optical coupling in atomic systems, which mediates long-range interactions between atoms. These one-dimensional systems can naturally possess couplings that are asymmetric between modes propagating in different directions. Strong long-range interaction among atoms via these modes can drive them to a self-organized periodic distribution. In this paper, we examine the self-organizing behavior of atoms in one dimension coupled to a chiral reservoir. We determine the solution to the equations of motion in different parameter regimes, relative to both the detuning of the pump laser that initializes the atomic dipole-dipole interactions and the degree of reservoir chirality. In addition, we calculate possible experimental signatures such as reflectivity from self-organized atoms and motional sidebands.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.94.053855}, author = {Eldredge, Zachary and Solano, Pablo and Chang, Darrick and Gorshkov, Alexey V.} } @article {ISI:000383977500002, title = {Serialized quantum error correction protocol for high-bandwidth quantum repeaters}, journal = {NEW JOURNAL OF PHYSICS}, volume = {18}, year = {2016}, month = {SEP 2}, pages = {093008}, issn = {1367-2630}, doi = {10.1088/1367-2630/18/9/093008}, author = {Glaudell, A. N. and Waks, E. and Taylor, J. M.} } @article {ISI:000381468300006, title = {Sisyphus Thermalization of Photons in a Cavity-Coupled Double Quantum Dot}, journal = {PHYSICAL REVIEW LETTERS}, volume = {117}, number = {5}, year = {2016}, month = {JUL 25}, pages = {056801}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.117.056801}, author = {Gullans, M. J. and Stehlik, J. and Liu, Y. -Y. and Eichler, C. and Petta, J. R. and Taylor, J. M.} } @article {ISI:000390960500015, title = {Subwavelength-width optical tunnel junctions for ultracold atoms}, journal = {PHYSICAL REVIEW A}, volume = {94}, number = {6}, year = {2016}, month = {DEC 27}, pages = {063422}, abstract = {We propose a method for creating far-field optical barrier potentials for ultracold atoms with widths that are narrower than the diffraction limit and can approach tens of nanometers. The reduced widths stem from the nonlinear atomic response to control fields that create spatially varying dark resonances. The subwavelength barrier is the result of the geometric scalar potential experienced by an atom prepared in such a spatially varying dark state. The performance of this technique, as well as its applications to the study of many-body physics and to the implementation of quantum-information protocols with ultracold atoms, are discussed, with a focus on the implementation of tunnel junctions.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.94.063422}, author = {Jendrzejewski, F. and Eckel, S. and Tiecke, T. G. and Juzeliunas, G. and Campbell, G. K. and Jiang, Liang and Gorshkov, A. V.} } @article { ISI:000367187000009, title = {Topological defect lasers}, journal = {JOURNAL OF OPTICS}, volume = {18}, number = {1}, year = {2016}, month = {JAN}, issn = {2040-8978}, doi = {10.1088/2040-8978/18/1/014005}, author = {Knitter, Sebastian and Liew, Seng Fatt and Xiong, Wen and Guy, Mikhael I. and Solomon, Glenn S. and Cao, Hui} } @article { ISI:000367780600001, title = {Topological phases with long-range interactions}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {4}, year = {2016}, month = {JAN 8}, pages = {041102}, issn = {1098-0121}, doi = {10.1103/PhysRevB.93.041102}, author = {Gong, Z. -X. and Maghrebi, M. F. and Hu, A. and Wall, M. L. and Foss-Feig, M. and Gorshkov, A. V.} } @article {ISI:000379747100019, title = {Toward optical quantum information processing with quantum dots coupled to microstructures {[}Invited]}, journal = {JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS}, volume = {33}, number = {7}, year = {2016}, month = {JUL 1}, pages = {C160}, issn = {0740-3224}, doi = {10.1364/JOSAB.33.00C160}, author = {Gazzano, Olivier and Solomon, Glenn S.} } @article { ISI:000377301200003, title = {Transport of Dirac electrons in a random magnetic field in topological heterostructures}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {24}, year = {2016}, month = {JUN 6}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.245111}, author = {Hurst, Hilary M. and Efimkin, Dmitry K. and Galitski, Victor} } @article {3085, title = {Absolute calibration of a variable attenuator using few-photon pulses}, journal = {Opt. Express}, volume = {23}, year = {2015}, month = {Jun}, pages = {16372{\textendash}16382}, abstract = {We demonstrate the ability to calibrate a variable optical attenuator directly at the few-photon level using a superconducting Transition Edge Sensor (TES). Because of the inherent linearity of photon-number resolving detection, no external calibrations are required, even for the energy of the laser pulses, which ranged from means of 0.15 to 18 photons per pulse at the detector. To verify this method, calibrations were compared to an independent conventional calibration made at much higher photon fluxes using analog detectors. In all cases, the attenuations estimated by the two methods agree within their uncertainties. Our few-photon measurement determined attenuations using the Poisson-Influenced K-Means Algorithm (PIKA) to extract mean numbers of photons per pulse along with the uncertainties of these means. The robustness of the method is highlighted by the agreement of the two calibrations even in the presence of significant drifts in the optical power over the course of the experiment.

}, keywords = {Quantum detectors, Radiometry}, doi = {10.1364/OE.23.016372}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-23-12-16372}, author = {Zachary H. Levine and Boris L. Glebov and Adam L. Pintar and Alan L. Migdall} } @article { ISI:000359357100004, title = {Anderson Localization and the Quantum Phase Diagram of Three Dimensional Disordered Dirac Semimetals}, journal = {PHYSICAL REVIEW LETTERS}, volume = {115}, number = {7}, year = {2015}, month = {AUG 11}, pages = {076601}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.115.076601}, author = {Pixley, J. H. and Goswami, Pallab and S. Das Sarma} } @article { ISI:000359675600005, title = {Axial anomaly and longitudinal magnetoresistance of a generic three-dimensional metal}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {7}, year = {2015}, month = {AUG 17}, pages = {075205}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.075205}, author = {Goswami, Pallab and Pixley, J. H. and S. Das Sarma} } @article { ISI:000360959800006, title = {Bilayer fractional quantum Hall states with dipoles}, journal = {PHYSICAL REVIEW A}, volume = {92}, number = {3}, year = {2015}, month = {SEP 10}, pages = {033609}, issn = {1050-2947}, doi = {10.1103/PhysRevA.92.033609}, author = {Yao, N. Y. and Bennett, S. D. and Laumann, C. R. and Lev, B. L. and Gorshkov, A. V.} } @article { ISI:000348119700005, title = {Broadband measurement of coating thermal noise in rigid Fabry-Perot cavities}, journal = {METROLOGIA}, volume = {52}, number = {1}, year = {2015}, month = {FEB}, issn = {0026-1394}, doi = {10.1088/0026-1394/52/1/17}, author = {Chalermsongsak, Tara and Seifert, Frank and Hall, Evan D. and Arai, Koji and Gustafson, Eric K. and Adhikari, Rana X.} } @article { ISI:000350276400002, title = {Charged skyrmions on the surface of a topological insulator}, journal = {PHYSICAL REVIEW B}, volume = {91}, number = {6}, year = {2015}, month = {FEB 18}, issn = {1098-0121}, doi = {10.1103/PhysRevB.91.060401}, author = {Hurst, Hilary M. and Efimkin, Dmitry K. and Zang, Jiadong and Victor M Galitski} } @article {ISI:000352196700010, title = {Constructing a Weyl semimetal by stacking one-dimensional topological phases}, journal = {PHYSICAL REVIEW B}, volume = {91}, number = {12}, year = {2015}, month = {MAR 30}, pages = {125438}, issn = {1098-0121}, doi = {10.1103/PhysRevB.91.125438}, author = {Ganeshan, Sriram and S. Das Sarma} } @article { ISI:000361316500008, title = {Coulomb Bound States of Strongly Interacting Photons}, journal = {PHYSICAL REVIEW LETTERS}, volume = {115}, number = {12}, year = {2015}, month = {SEP 16}, pages = {123601}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.115.123601}, author = {Maghrebi, M. F. and Gullans, M. J. and Bienias, P. and Choi, S. and Martin, I. and Firstenberg, O. and Lukin, M. D. and Buechler, H. P. and Gorshkov, A. V.} } @article { ISI:000356902400125, title = {Deep frequency modulation interferometry}, journal = {OPTICS EXPRESS}, volume = {23}, number = {11}, year = {2015}, month = {JUN 1}, pages = {14753-14762}, issn = {1094-4087}, doi = {10.1364/OE.23.014753}, author = {Gerberding, Oliver} } @article { ISI:000354248200005, title = {Enhancement of superconductivity via periodic modulation in a three-dimensional model of cuprates}, journal = {PHYSICAL REVIEW B}, volume = {91}, number = {18}, year = {2015}, month = {MAY 8}, issn = {1098-0121}, doi = {10.1103/PhysRevB.91.184506}, author = {Raines, Zachary M. and Stanev, Valentin and Victor M Galitski} } @article { ISI:000367065800003, title = {Excitonic and nematic instabilities on the surface of topological Kondo insulators}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {24}, year = {2015}, month = {DEC 21}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.245431}, author = {Roy, Bitan and Hofmann, Johannes and Stanev, Valentin and Sau, Jay D. and Galitski, Victor} } @article {ISI:000372360400001, title = {Feshbach enhanced s-wave scattering of fermions: direct observation with optimized absorption imaging}, journal = {NEW JOURNAL OF PHYSICS}, volume = {18}, year = {2015}, month = {DEC 17}, pages = {013001}, issn = {1367-2630}, doi = {10.1088/1367-2630/18/1/013001}, author = {Genkina, D. and Aycock, L. M. and Stuhl, B. K. and Lu, H-I and Williams, R. A. and Ian B Spielman} } @article { ISI:000352058600004, title = {Fractional quantum Hall states of Rydberg polaritons}, journal = {PHYSICAL REVIEW A}, volume = {91}, number = {3}, year = {2015}, month = {MAR 31}, pages = {033838}, issn = {1050-2947}, doi = {10.1103/PhysRevA.91.033838}, author = {Maghrebi, Mohammad F. and Yao, Norman Y. and Hafezi, Mohammad and Pohl, Thomas and Firstenberg, Ofer and Gorshkov, Alexey V.} } @article { ISI:000360894300012, title = {Gigantic Surface Lifetime of an Intrinsic Topological Insulator}, journal = {PHYSICAL REVIEW LETTERS}, volume = {115}, number = {11}, year = {2015}, month = {SEP 9}, pages = {116801}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.115.116801}, author = {Neupane, Madhab and Xu, Su-Yang and Ishida, Yukiaki and Jia, Shuang and Fregoso, Benjamin M. and Liu, Chang and Belopolski, Ilya and Bian, Guang and Alidoust, Nasser and Durakiewicz, Tomasz and Victor M Galitski and Shin, Shik and Cava, Robert J. and Hasan, M. Zahid} } @article { ISI:000358737200017, title = {Harnessing high-dimensional hyperentanglement through a biphoton frequency comb}, journal = {NATURE PHOTONICS}, volume = {9}, number = {8}, year = {2015}, month = {AUG}, pages = {536+}, issn = {1749-4885}, doi = {10.1038/NPHOTON.2015.110}, author = {Xie, Zhenda and Zhong, Tian and Shrestha, Sajan and Xu, XinAn and Liang, Junlin and Gong, Yan-Xiao and Bienfang, Joshua C. and Restelli, Alessandro and Shapiro, Jeffrey H. and Wong, Franco N. C. and Wong, Chee Wei} } @article { ISI:000365507200003, title = {Hybridization of Higgs modes in a bond-density-wave state in cuprates}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {18}, year = {2015}, month = {NOV 24}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.184511}, author = {Raines, Zachary M. and Stanev, Valentin G. and Galitski, Victor M.} } @article {3000, title = {Hyperfine Anomalies in Fr: Boundaries of the Spherical Single Particle Model}, journal = {Phys. Rev. Lett.}, volume = {115}, year = {2015}, month = {Jul}, pages = {042501}, doi = {10.1103/PhysRevLett.115.042501}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.115.042501}, author = {Zhang, J. and Tandecki, M. and Collister, R. and Aubin, S. and Behr, J. A. and Gomez, E. and Gwinner, G. and Orozco, L. A. and Pearson, M. R. and Sprouse, G. D.} } @article { ISI:000358623500009, title = {Inhomogeneous broadening of optical transitions of Rb-87 atoms in an optical nanofiber trap}, journal = {JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}, volume = {48}, number = {16, SI}, year = {2015}, month = {AUG 28}, pages = {165004}, issn = {0953-4075}, doi = {10.1088/0953-4075/48/16/165004}, author = {Lee, J. and Grover, J. A. and Hoffman, J. E. and Orozco, L. A. and Rolston, S. L.} } @article { ISI:000364011400010, title = {Injection locking of a semiconductor double-quantum-dot micromaser}, journal = {PHYSICAL REVIEW A}, volume = {92}, number = {5}, year = {2015}, month = {NOV 2}, issn = {1050-2947}, doi = {10.1103/PhysRevA.92.053802}, author = {Liu, Y. -Y. and Stehlik, J. and Gullans, M. J. and Taylor, J. M. and Petta, J. R.} } @article { ISI:000352196000006, title = {Long range p-wave proximity effect into a disordered metal}, journal = {PHYSICAL REVIEW B}, volume = {91}, number = {9}, year = {2015}, month = {MAR 30}, issn = {1098-0121}, doi = {10.1103/PhysRevB.91.094518}, author = {Keser, Aydin Cem and Stanev, Valentin and Victor M Galitski} } @article {2899, title = {Magic wavelengths for the 5s-18s transition in rubidium}, journal = {Phys. Rev. A}, volume = {91}, year = {2015}, month = {Mar}, pages = {032518}, doi = {10.1103/PhysRevA.91.032518}, url = {http://link.aps.org/doi/10.1103/PhysRevA.91.032518}, author = {Goldschmidt, E A and Norris, D G and Koller, S B and Wyllie, R and Brown, R C and Porto, J V and Safronova, U I and Safronova, M S} } @article {ISI:000354928200001, title = {Magnetic End States in a Strongly Interacting One-Dimensional Topological Kondo Insulator}, journal = {PHYSICAL REVIEW X}, volume = {5}, number = {2}, year = {2015}, month = {MAY 22}, pages = {021017}, issn = {2160-3308}, doi = {10.1103/PhysRevX.5.021017}, author = {Lobos, Alejandro M. and Dobry, Ariel O. and Victor M Galitski} } @article { ISI:000363507300007, title = {Many-Body Localization and Quantum Nonergodicity in a Model with a Single-Particle Mobility Edge}, journal = {PHYSICAL REVIEW LETTERS}, volume = {115}, number = {18}, year = {2015}, month = {OCT 28}, pages = {186601}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.115.186601}, author = {Li, Xiaopeng and Ganeshan, Sriram and Pixley, J. H. and S. Das Sarma} } @conference { ISI:000354263300010, title = {Measuring the Propagation of Information and Entanglement in Dispersive Media}, booktitle = {SLOW LIGHT, FAST LIGHT, AND OPTO-ATOMIC PRECISION METROLOGY VIII}, series = {Proceedings of SPIE}, volume = {9378}, year = {2015}, note = {Conference on Slow Light, Fast Light, and Opto-Atomic Precision Metrology VIII, San Francisco, CA, FEB 08-12, 2015}, isbn = {978-1-62841-468-4}, issn = {0277-786X}, doi = {10.1117/12.2086776}, author = {Clark, Jeremy B. and Glasser, Ryan T. and Glorieux, Quentin and Vogl, Ulrich and Li, Tian and Jones, Kevin M. and Lett, Paul D.}, editor = {Shahriar, SM and Scheuer, J} } @article {ISI:000351362200012, title = {Movable Thin-Film Superconducting Resonator Coupled to a Tapered Optical Microfiber at 15 mK}, journal = {IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY}, volume = {25}, number = {3}, year = {2015}, month = {JUN}, pages = {1700305}, issn = {1051-8223}, doi = {10.1109/TASC.2014.2379628}, author = {Voigt, K. D. and Hertzberg, J. B. and Hoffman, J. E. and Grover, J. A. and Solano, P. and Budoyo, R. P. and Ballard, C. and Lee, J. and Anderson, J. R. and Lobb, C. J. and Orozco, L. A. and Rolston, S. L. and Wellstood, E. C.} } @article { ISI:000352298700024, title = {Moving solitons in a one-dimensional fermionic superfluid}, journal = {PHYSICAL REVIEW A}, volume = {91}, number = {2}, year = {2015}, month = {FEB 17}, issn = {1050-2947}, doi = {10.1103/PhysRevA.91.023616}, author = {Efimkin, Dmitry K. and Victor M Galitski} } @article {ISI:000352472400008, title = {Nearest Neighbor Tight Binding Models with an Exact Mobility Edge in One Dimension}, journal = {PHYSICAL REVIEW LETTERS}, volume = {114}, number = {14}, year = {2015}, month = {APR 9}, pages = {146601}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.114.146601}, author = {Ganeshan, Sriram and Pixley, J. H. and S. Das Sarma} } @article {2878, title = {Nearly Linear Light Cones in Long-Range Interacting Quantum Systems}, journal = {Phys. Rev. Lett.}, volume = {114}, year = {2015}, month = {Apr}, pages = {157201}, doi = {10.1103/PhysRevLett.114.157201}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.114.157201}, author = {Foss-Feig, Michael and Gong, Zhe-Xuan and Clark, Charles W. and Gorshkov, Alexey V.} } @article { ISI:000362894500004, title = {Nonuniversal weak antilocalization effect in cubic topological Kondo insulators}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {16}, year = {2015}, month = {OCT 14}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.165415}, author = {Dzero, Maxim and Vavilov, Maxim G. and Kechedzhi, Kostyantyn and Victor M Galitski} } @conference { ISI:000359481900003, title = {On-Chip Silicon Photonic Thermometers: from Waveguide Bragg Grating to Ring Resonators sensors}, booktitle = {ADVANCED ENVIRONMENTAL, CHEMICAL, AND BIOLOGICAL SENSING TECHNOLOGIES XII}, series = {Proceedings of SPIE}, volume = {9486}, year = {2015}, note = {Conference on Advanced Environmental, Chemical, and Biological Sensing Technologies XII, Baltimore, MD, APR 20-21, 2015}, isbn = {978-1-62841-602-2}, issn = {0277-786X}, doi = {10.1117/12.2176666}, author = {Klimov, Nikolai N. and Purdy, Thomas and Ahmed, Zeeshan}, editor = {VoDinh, T and Lieberman, RA and Gauglitz, GG} } @article { ISI:000362891800003, title = {Optical activity as a test for dynamic chiral magnetic effect of Weyl semimetals}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {16}, year = {2015}, month = {OCT 12}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.161110}, author = {Goswami, Pallab and Sharma, Girish and Tewari, Sumanta} } @article { ISI:000364407400005, title = {Optical control of donor spin qubits in silicon}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {19}, year = {2015}, month = {NOV 11}, pages = {195411}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.195411}, author = {Gullans, M. J. and Taylor, J. M.} } @article { ISI:000362491400023, title = {Optomechanical reference accelerometer}, journal = {METROLOGIA}, volume = {52}, number = {5}, year = {2015}, month = {OCT}, pages = {654-665}, issn = {0026-1394}, doi = {10.1088/0026-1394/52/5/654}, author = {Gerberding, O. and Cervantes, F. Guzman and Melcher, J. and Pratt, J. R. and Taylor, J. M.} } @article {3004, title = {Parafermionic Zero Modes in Ultracold Bosonic Systems}, journal = {Phys. Rev. Lett.}, volume = {115}, year = {2015}, month = {Aug}, pages = {065301}, doi = {10.1103/PhysRevLett.115.065301}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.115.065301}, author = {Maghrebi, M. F. and Ganeshan, S. and Clarke, D. J. and Gorshkov, A. V. and Sau, J. D.} } @article { ISI:000354546100006, title = {Phonon-Assisted Gain in a Semiconductor Double Quantum Dot Maser}, journal = {PHYSICAL REVIEW LETTERS}, volume = {114}, number = {19}, year = {2015}, month = {MAY 13}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.114.196802}, author = {Gullans, M. J. and Liu, Y. -Y. and Stehlik, J. and Petta, J. R. and Taylor, J. M.} } @article {3009, title = {Photon-correlation measurements of atomic-cloud temperature using an optical nanofiber}, journal = {Phys. Rev. A}, volume = {92}, year = {2015}, month = {Jul}, pages = {013850}, doi = {10.1103/PhysRevA.92.013850}, url = {http://link.aps.org/doi/10.1103/PhysRevA.92.013850}, author = {Grover, J. A. and Solano, P. and Orozco, L. A. and Rolston, S. L.} } @article { ISI:000352864700001, title = {Photon-efficient quantum key distribution using time-energy entanglement with high-dimensional encoding}, journal = {NEW JOURNAL OF PHYSICS}, volume = {17}, year = {2015}, month = {FEB 4}, issn = {1367-2630}, doi = {10.1088/1367-2630/17/2/022002}, author = {Zhong, Tian and Zhou, Hongchao and Horansky, Robert D. and Lee, Catherine and Verma, Varun B. and Lita, Adriana E. and Restelli, Alessandro and Bienfang, Joshua C. and Mirin, Richard P. and Gerrits, Thomas and Nam, Sae Woo and Marsili, Francesco and Shaw, Matthew D. and Zhang, Zheshen and Wang, Ligong and Englund, Dirk and Wornell, Gregory W. and Shapiro, Jeffrey H. and Wong, Franco N. 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F. and Gullans, M. and Lukin, M. D. and Gorshkov, A. V. and Buechler, H. P.} } @article { ISI:000333324300005, title = {Self-consistent theory of ferromagnetism on the surface of a topological insulator}, journal = {PHYSICAL REVIEW B}, volume = {89}, number = {11}, year = {2014}, month = {MAR 25}, issn = {1098-0121}, doi = {10.1103/PhysRevB.89.115431}, author = {Efimkin, D. K. and Victor M Galitski} } @article { ISI:000333007900001, title = {Spiral antiferromagnets beyond the spin-wave approximation: Frustrated XY and Heisenberg models on the honeycomb lattice}, journal = {PHYSICAL REVIEW B}, volume = {89}, number = {9}, year = {2014}, month = {MAR 19}, issn = {1098-0121}, doi = {10.1103/PhysRevB.89.094413}, author = {Di Ciolo, Andrea and Carrasquilla, Juan and Becca, Federico and Rigol, Marcos and Victor M Galitski} } @article {2726, title = {Stoner Ferromagnetism in a Thermal Pseudospin-1/2 Bose Gas}, journal = {Phys. Rev. Lett.}, volume = {113}, year = {2014}, month = {Oct}, pages = {185302}, doi = {10.1103/PhysRevLett.113.185302}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.113.185302}, author = {Radi{\'c}, Juraj and Natu, Stefan S. and Victor M Galitski} } @article { ISI:000332421900003, title = {Strong hyperfine-induced modulation of an optically driven hole spin in an InAs quantum dot}, journal = {PHYSICAL REVIEW B}, volume = {89}, number = {7}, year = {2014}, month = {FEB 28}, issn = {1098-0121}, doi = {10.1103/PhysRevB.89.075316}, author = {Carter, S. G. and Economou, Sophia E. and Greilich, A. and Barnes, Edwin and Sweeney, T. and Bracker, A. S. and Gammon, D.} } @article { ISI:000341165700001, title = {Strongly interacting Dirac liquid on the surface of a topological Kondo insulator}, journal = {PHYSICAL REVIEW B}, volume = {90}, number = {8}, year = {2014}, month = {AUG 21}, issn = {1098-0121}, doi = {10.1103/PhysRevB.90.081113}, author = {Efimkin, Dmitry K. and Victor M Galitski} } @article { ISI:000344022600002, title = {Surface theory of a family of topological Kondo insulators}, journal = {PHYSICAL REVIEW B}, volume = {90}, number = {15}, year = {2014}, month = {OCT 21}, issn = {1098-0121}, doi = {10.1103/PhysRevB.90.155314}, author = {Roy, Bitan and Sau, Jay D. and Dzero, Maxim and Victor M Galitski} } @article { ISI:000331946800007, title = {Synthetic Gauge Fields in Synthetic Dimensions}, journal = {PHYSICAL REVIEW LETTERS}, volume = {112}, number = {4}, year = {2014}, month = {JAN 28}, pages = {043001}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.112.043001}, author = {Celi, A. and Massignan, P. and Julius Ruseckas and Nathan Goldman and Ian B Spielman and Gediminas Juzeliunas and Maciej Lewenstein} } @article { ISI:000342797100008, title = {Topological Growing of Laughlin States in Synthetic Gauge Fields}, journal = {PHYSICAL REVIEW LETTERS}, volume = {113}, number = {15}, year = {2014}, month = {OCT 7}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.113.155301}, author = {Grusdt, Fabian and Letscher, Fabian and Hafezi, Mohammad and Fleischhauer, Michael} } @article { ISI:000339491100006, title = {Topological Response Theory of Abelian Symmetry-Protected Topological Phases in Two Dimensions}, journal = {PHYSICAL REVIEW LETTERS}, volume = {112}, number = {14}, year = {2014}, month = {APR 9}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.112.141602}, author = {Cheng, Meng and Gu, Zheng-Cheng} } @article { ISI:000338995700025, title = {Ultrahigh transmission optical nanofibers}, journal = {AIP ADVANCES}, volume = {4}, number = {6}, year = {2014}, month = {JUN}, issn = {2158-3226}, doi = {10.1063/1.4879799}, author = {Hoffman, J. E. and Ravets, S. and Grover, J. A. and Solano, P. and Kordell, P. R. and Wong-Campos, J. D. and Orozco, L. A. and Rolston, S. L.} } @article { ISI:000337348300008, title = {Z(2) index for gapless fermionic modes in the vortex core of three-dimensional paired Dirac fermions}, journal = {PHYSICAL REVIEW B}, volume = {89}, number = {14}, year = {2014}, month = {APR 14}, issn = {1098-0121}, doi = {10.1103/PhysRevB.89.144507}, author = {Roy, Bitan and Goswami, Pallab} } @article { ISI:000319294100058, title = {Asymmetric superconducting quantum interference devices for suppression of phase diffusion in small Josephson junctions}, journal = {J. Appl. Phys.}, volume = {113}, number = {18}, year = {2013}, month = {MAY 14}, pages = {183905}, issn = {0021-8979}, doi = {10.1063/1.4804057}, author = {D F Sullivan and S K Dutta and M Dreyer and M A Gubrud and A Roychowdhury and Jeffrey R Anderson and Christopher J Lobb and F C Wellstood} } @conference { ISI:000355262504290, title = {Beating the Standard Quantum Limit for Nonorthogonal Multi-State Discrimination}, booktitle = {2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)}, series = {Conference on Lasers and Electro-Optics}, year = {2013}, note = {Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, JUN 09-14, 2013}, isbn = {978-1-55752-973-2}, issn = {2160-9020}, author = {Becerra, F. E. and J. Fan and Baumgartner, G. and Goldhar, J. and Kosloski, J. T. and Migdall, A.} } @conference { ISI:000355316301431, title = {Bipartite Quantum Correlations in a Fast-Light Medium Generated with Four-Wave-Mixing in Rubidium Vapour}, booktitle = {2013 CONFERENCE ON AND INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE LASERS AND ELECTRO-OPTICS EUROPE (CLEO EUROPE/IQEC)}, year = {2013}, note = {Conference on Lasers and Electro-Optics Europe \& International Quantum Electronics Conference (CLEO/Europe-IQEC), Munich, GERMANY, MAY 12-16, 2013}, isbn = {978-1-4799-0594-2}, author = {Vogl, U. and Glasser, R. T. and Lett, P. D.} } @article { ISI:000329910500055, title = {Commissioning of the Francium Trapping Facility at TRIUMF}, journal = {JOURNAL OF INSTRUMENTATION}, volume = {8}, year = {2013}, month = {DEC}, issn = {1748-0221}, doi = {10.1088/1748-0221/8/12/P12006}, author = {Tandecki, M. and Zhang, J. and Collister, R. and Aubin, S. and Behr, J. A. and Gomez, E. and Gwinner, G. and Luis A Orozco and Pearson, M. R.} } @inbook { ISI:000335188500012, title = {Cumulant Dynamics of Strongly Interacting Ultracold Gases}, booktitle = {QUANTUM GASES: FINITE TEMPERATURE AND NON-EQUILIBRIUM DYNAMICS}, series = {Cold Atoms}, volume = {1}, year = {2013}, pages = {121-131}, isbn = {978-1-848168-12-1; 978-1-848168-10-7}, issn = {2045-9734}, author = {Hanna, Thomas M. and Mur-Petit, Jordi}, editor = {Proukakis, N and Gardiner, S and Davis, M and Szymanska, M} } @conference { ISI:000355262505007, title = {Demonstrating High Symmetric Single-Mode Single-Photon Heralding Efficiency in Spontaneous Parametric Downconversion}, booktitle = {2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)}, series = {Conference on Lasers and Electro-Optics}, year = {2013}, note = {Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, JUN 09-14, 2013}, isbn = {978-1-55752-973-2}, issn = {2160-9020}, author = {Pereira, M. and Becerra, F. and B. L. Glebov and J. Fan and S. W. Nam and Migdall, A.} } @article { ISI:000318488000013, title = {Demonstration of a dynamic bandpass frequency filter in a rare-earth ion-doped crystal}, journal = {JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS}, volume = {30}, number = {5}, year = {2013}, month = {MAY}, pages = {1173-1177}, issn = {0740-3224}, doi = {10.1364/JOSAB.30.001173}, author = {Beavan, Sarah E. and Goldschmidt, Elizabeth A. and Sellars, Matthew J.} } @article { ISI:000322146300015, title = {Deterministic generation of single photons via multiplexing repetitive parametric downconversions}, journal = {APPLIED PHYSICS LETTERS}, volume = {103}, number = {3}, year = {2013}, month = {JUL 15}, issn = {0003-6951}, doi = {10.1063/1.4816059}, author = {Glebov, Boris L. and J. Fan and Migdall, A.} } @article {ISI:000318677300039, title = {Direct imaging of topological edge states in cold-atom systems}, journal = {PNAS}, volume = {110}, number = {17}, year = {2013}, month = {apr}, pages = {6736}, keywords = {chiral edge states, degenerate atomic gases, optical lattices, Quantum Hall effects}, issn = {0027-8424}, doi = {10.1073/pnas.1300170110}, author = {Nathan Goldman and Dalibard, Jean and Dauphin, Alexandre and Fabrice Gerbier and Maciej Lewenstein and Peter Zoller and Ian B Spielman} } @article {2323, title = {Driven electronic states at the surface of a topological insulator}, journal = {Physical Review B}, volume = {88}, year = {2013}, month = {10/23/2013}, pages = {155129}, abstract = {Motivated by recent photoemission experiments on the surface of topological insulators we compute the spectrum of driven topological surface excitations in the presence of an external light source. We completely characterize the spectral function of these nonequilibrium electron excitations for both linear and circular polarizations of the incident light. We find that in the latter case, the circularly polarized light gaps out the surface states, whereas linear polarization gives rise to an anisotropic metal with multiple Dirac cones. We compare the sizes of the gaps with recent pump-probe photoemission measurements and find good agreement. We also identify theoretically several new features in the time-dependent spectral function, such as shadow Dirac cones.

}, keywords = {Dirac Cone, Topological Insulator}, doi = {10.1103/PhysRevB.88.155129}, url = {http://prb.aps.org/abstract/PRB/v88/i15/e155129}, author = {Benjamin M Fregoso and Yi-Hsieh Wang and N Gedik and Victor M Galitski} } @article { ISI:000326148700059, title = {Evidence for hydrogen two-level systems in atomic layer deposition oxides}, journal = {APPLIED PHYSICS LETTERS}, volume = {103}, number = {16}, year = {2013}, month = {OCT 14}, issn = {0003-6951}, doi = {10.1063/1.4826253}, author = {Khalil, M. S. and Stoutimore, M. J. A. and Gladchenko, S. and Holder, A. M. and Musgrave, C. B. and Kozen, A. C. and Rubloff, G. and Liu, Y. Q. and Gordon, R. G. and Yum, J. H. and Banerjee, S. K. and Lobb, C. J. and Osborn, K. D.} } @article { ISI:000325362500001, title = {Exact Classification of Landau-Majorana-Stuckelberg-Zener Resonances by Floquet Determinants}, journal = {Phys. Rev. Lett.}, volume = {111}, number = {13}, year = {2013}, month = {SEP 25}, pages = {130405}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.111.130405}, author = {Ganeshan, Sriram and Barnes, Edwin and S. Das Sarma} } @article { ISI:000313546100001, title = {Experimental characterization of Gaussian quantum discord generated by four-wave mixing}, journal = {Phys. Rev. A}, volume = {87}, number = {1}, year = {2013}, month = {JAN 16}, pages = {010101}, issn = {1050-2947}, doi = {10.1103/PhysRevA.87.010101}, author = {Vogl, Ulrich and Ryan T Glasser and Quentin Glorieux and Jeremy B Clark and N V Corso Trejo and Paul D Lett} } @article {2407, title = {Experimental demonstration of a receiver beating the standard quantum limit for multiple nonorthogonal state discrimination}, journal = {Nature Photonics}, volume = {7}, year = {2013}, month = {1/2013}, pages = {147-152}, doi = {10.1038/nphoton.2012.316}, author = {Francisco E Becerra and Jingyun Fan and G. Baumgartner and Goldhar, Julius and T. Kosloski and Alan L Migdall} } @article { ISI:000315572200022, title = {Experimental Test of an Event-Based Corpuscular Model Modification as an Alternative to Quantum Mechanics}, journal = {J. Phys. Soc. Jpn.}, volume = {82}, number = {3}, year = {2013}, month = {MAR}, issn = {0031-9015}, doi = {10.7566/JPSJ.82.034004}, author = {Giorgio Brida and Ivo P Degiovanni and Marco Genovese and Alan L Migdall and Fabrizio Piacentini and Sergey V Polyakov and Traina, Paolo} } @conference { ISI:000326980500015, title = {Feedback in a cavity QED system for control of quantum beats}, booktitle = {ICAP 2012 - 23RD INTERNATIONAL CONFERENCE ON ATOMIC PHYSICS}, series = {EPJ Web of Conferences}, volume = {57}, year = {2013}, note = {23rd International Conference on Atomic Physics (ICAP), Ecole Polytechnique, FRANCE, JUL 23-27, 2012}, issn = {2100-014X}, doi = {10.1051/epjconf/20135703005}, author = {Cimmarusti, A. D. and Patterson, B. D. and Schroeder, C. A. and Orozco, L. A. and Barberis-Blostein, P. and Carmichael, H. J.}, editor = {Dulieu, O and Grangier, P and Leduc, M and Perrin, H} } @article { ISI:000316660000012, title = {Feshbach resonances, weakly bound molecular states, and coupled-channel potentials for cesium at high magnetic fields}, journal = {Phys. Rev. A}, volume = {87}, number = {3}, year = {2013}, month = {MAR 25}, issn = {1050-2947}, doi = {10.1103/PhysRevA.87.032517}, author = {Martin Berninger and Alessandro Zenesini and Bo Huang and Walter Harm and Naegerl, Hanns-Christoph and Francesca Ferlaino and Rudolf Grimm and Paul S Julienne and Jeremy M Hutson} } @conference { ISI:000355262505148, title = {Generation of Photon-Number States Using Repetitive Parametric Downconversion and Conditional Measurement}, booktitle = {2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)}, series = {Conference on Lasers and Electro-Optics}, year = {2013}, note = {Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, JUN 09-14, 2013}, isbn = {978-1-55752-973-2}, issn = {2160-9020}, author = {B. L. Glebov and J. Fan and Migdall, A.} } @article { ISI:000323481000003, title = {Gradient echo memory in an ultra-high optical depth cold atomic ensemble}, journal = {NEW JOURNAL OF PHYSICS}, volume = {15}, year = {2013}, month = {AUG 23}, issn = {1367-2630}, doi = {10.1088/1367-2630/15/8/085027}, author = {Sparkes, B. M. and Bernu, J. and Hosseini, M. and Geng, J. and Glorieux, Q. and Altin, P. A. and Lam, P. K. and Robins, N. P. and Buchler, B. C.} } @conference { ISI:000326703000013, title = {A hybrid quantum system of atoms trapped on ultrathin optical fibers coupled to superconductors}, booktitle = {QUANTUM COMMUNICATIONS AND QUANTUM IMAGING XI}, series = {Proceedings of SPIE}, volume = {8875}, year = {2013}, note = {Conference on Quantum Communications and Quantum Imaging XI, San Diego, CA, AUG 26-29, 2013}, isbn = {978-0-8194-9725-3}, issn = {0277-786X}, doi = {10.1117/12.2024362}, author = {Rolston, S. L. and Anderson, J. R. and Chukwu, U. and Grover, J. and Hertzberg, J. B. and Hoffman, J. E. and Kordell, P. and Lee, J. and Lobb, C. J. and Orozco, L. A. and Ravets, S. and Solano, P. and Voigt, K. D. and Wellstood, F. C. and Wong-Campos, J. D. and Beadie, G. and Fatemi, F. K.}, editor = {Meyers, RE and Shih, Y and Deacon, KS} } @article { ISI:000327237700003, title = {Individual addressing in quantum computation through spatial refocusing}, journal = {PHYSICAL REVIEW A}, volume = {88}, number = {5}, year = {2013}, month = {NOV 21}, issn = {1050-2947}, doi = {10.1103/PhysRevA.88.052325}, author = {Shen, C. and Gong, Z-X and Duan, L-M} } @article { ISI:000319393900004, title = {Interacting steps with finite-range interactions: Analytical approximation and numerical results}, journal = {PHYSICAL REVIEW E}, volume = {87}, number = {5}, year = {2013}, month = {MAY 24}, issn = {1539-3755}, doi = {10.1103/PhysRevE.87.052405}, author = {Felipe Jaramillo, Diego and Tellez, Gabriel and Luis Gonzalez, Diego and Einstein, T. L.} } @inbook { ISI:000335188500007, title = {Introduction to Theoretical Modelling}, booktitle = {QUANTUM GASES: FINITE TEMPERATURE AND NON-EQUILIBRIUM DYNAMICS}, series = {Cold Atoms}, volume = {1}, year = {2013}, pages = {63-83}, isbn = {978-1-848168-12-1; 978-1-848168-10-7}, issn = {2045-9734}, author = {Davis, Matthew J. and Gardiner, Simon A. and Hanna, Thomas M. and Nicolai Nygaard and Proukakis, Nick P. and Szymanska, Marzena H.}, editor = {Proukakis, N and Gardiner, S and Davis, M and Szymanska, M} } @article { ISI:000321752400031, title = {Magnetoresistance of an Anderson Insulator of Bosons}, journal = {Phys. Rev. Lett.}, volume = {111}, number = {2}, year = {2013}, month = {JUL 9}, pages = {026801}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.111.026801}, author = {Gangopadhyay, Anirban and Victor M Galitski and Mueller, Markus} } @article {ISI:000313427300004, title = {Measuring topology in a laser-coupled honeycomb lattice: from Chern insulators to topological semi-metals}, journal = {New J. Phys.}, volume = {15}, year = {2013}, pages = {013025}, abstract = {Ultracold fermions trapped in a honeycomb optical lattice constitute a versatile setup to experimentally realize the Haldane model (1988 Phys. Rev. Lett. 61 2015). In this system, a non-uniform synthetic magnetic flux can be engineered through laser-induced methods, explicitly breaking time-reversal symmetry. This potentially opens a bulk gap in the energy spectrum, which is associated with a non-trivial topological order, i.e. a non-zero Chern number. In this paper, we consider the possibility of producing and identifying such a robust Chern insulator in the laser-coupled honeycomb lattice. We explore a large parameter space spanned by experimentally controllable parameters and obtain a variety of phase diagrams, clearly identifying the accessible topologically non-trivial regimes. We discuss the signatures of Chern insulators in cold-atom systems, considering available detection methods. We also highlight the existence of topological semi-metals in this system, which are gapless phases characterized by non-zero winding numbers, not present in Haldane{\textquoteright}s original model.

}, issn = {1367-2630}, doi = {10.1088/1367-2630/15/1/013025}, author = {Nathan Goldman and E Anisimovas and Fabrice Gerbier and P Oehberg and Ian B Spielman and Gediminas Juzeliunas} } @conference { ISI:000355262504294, title = {Mode reconstruction by multi-photon statistics}, booktitle = {2013 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)}, series = {Conference on Lasers and Electro-Optics}, year = {2013}, note = {Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, JUN 09-14, 2013}, isbn = {978-1-55752-973-2}, issn = {2160-9020}, author = {Goldschmidt, Elizabeth A. and Polyakov, Sergey V. and Alan Migdall and Peters, Silke and Kueck, Stefan and Piacentini, Fabrizio and Berchera, Ivano Ruo and Brida, Giorgio and Degiovanni, Ivo P. and Genovese, Marco} } @article {1957, title = {Mode reconstruction of a light field by multi-photon statistics}, journal = {Phys. Rev. A}, volume = {88}, year = {2013}, chapter = {013822}, url = {http://link.aps.org/doi/10.1103/PhysRevA.88.013822}, author = {Elizabeth A Goldschmidt and Fabrizio Piacentini and Ivano Ruo Berchera and Sergey V Polyakov and Silke Peters and Stefan Kuck and Giorgio Brida and Ivo P Degiovanni and Alan L Migdall and Marco Genovese} } @article { ISI:000321837000027, title = {Mode reconstruction of a light field by multiphoton statistics}, journal = {Phys. Rev. A}, volume = {88}, number = {1}, year = {2013}, month = {JUL 15}, pages = {013822}, issn = {1050-2947}, doi = {10.1103/PhysRevA.88.013822}, author = {Elizabeth A Goldschmidt and Fabrizio Piacentini and Ivano Ruo Berchera and Sergey V Polyakov and Silke Peters and Kueck, Stefan and Giorgio Brida and Ivo P Degiovanni and Alan L Migdall and Marco Genovese} } @article {2383, title = {Nature of the phases in the frustrated XY model on the honeycomb lattice}, journal = {Phys. Rev. B}, volume = {88}, year = {2013}, month = {Dec}, pages = {241109}, doi = {10.1103/PhysRevB.88.241109}, url = {http://link.aps.org/doi/10.1103/PhysRevB.88.241109}, author = {Carrasquilla, Juan and Andrea Di Ciolo and Becca, Federico and Victor M Galitski and Rigol, Marcos} } @article { ISI:000325709500010, title = {A new exotic state in an old material: a tale of SmB6}, journal = {Journal of Experimental and Theoretical Physics}, volume = {117}, number = {3}, year = {2013}, month = {SEP}, pages = {499-507}, issn = {1063-7761}, doi = {10.1134/S1063776113110083}, author = {Maxim Dzero and Victor M Galitski} } @article { ISI:000317963700006, title = {Oscillator-field model of moving mirrors in quantum optomechanics}, journal = {Phys. Rev. A}, volume = {87}, number = {4}, year = {2013}, month = {APR 24}, issn = {1050-2947}, doi = {10.1103/PhysRevA.87.043832}, author = {Galley, Chad R. and Ryan O Behunin and Bei-Lok Hu} } @article {ISI:000321262500005, title = {Photon-number-resolved detection of photon-subtracted thermal light}, journal = {Optics Letters}, volume = {38}, number = {13}, year = {2013}, month = {jul}, pages = {2171}, issn = {0146-9592}, doi = {10.1364/OL.38.002171}, author = {Zhai, Yanhua and Francisco E Becerra and Boris L Glebov and Wen, Jianming and Adriana E Lita and Calkins, Brice and Gerrits, Thomas and Jingyun Fan and Sae Woo Nam and Alan L Migdall} } @article { ISI:000323202400001, title = {Practical Implementation of a Test of Event-Based Corpuscular Model as an Alternative to Quantum Mechanics}, journal = {Foundations of Physics}, volume = {43}, number = {8}, year = {2013}, month = {AUG}, pages = {913-922}, issn = {0015-9018}, doi = {10.1007/s10701-013-9718-4}, author = {Sergey V Polyakov and Fabrizio Piacentini and Traina, Paolo and Ivo P Degiovanni and Alan L Migdall and Giorgio Brida and Marco Genovese} } @article {ISI:000321838600006, title = {Preparation of nonequilibrium nuclear spin states in double quantum dots}, journal = {Phys. Rev. B}, volume = {88}, number = {3}, year = {2013}, month = {jul}, pages = {035309}, issn = {1098-0121}, doi = {10.1103/PhysRevB.88.035309}, author = {M Gullans and J J Krich and Jacob M Taylor and B I Halperin and Mikhail D Lukin} } @article { ISI:000327550700006, title = {Prethermalization and dynamic phase transition in an isolated trapped ion spin chain}, journal = {NEW JOURNAL OF PHYSICS}, volume = {15}, year = {2013}, month = {NOV 26}, issn = {1367-2630}, doi = {10.1088/1367-2630/15/11/113051}, author = {Gong, Zhe-Xuan and Duan, L-M} } @article { ISI:000326078100006, title = {Quantum Cherenkov radiation and noncontact friction}, journal = {PHYSICAL REVIEW A}, volume = {88}, number = {4}, year = {2013}, month = {OCT 21}, issn = {1050-2947}, doi = {10.1103/PhysRevA.88.042509}, author = {Maghrebi, Mohammad F. and Golestanian, Ramin and Kardar, Mehran} } @article { ISI:000315727700009, title = {Quantum interference and light polarization effects in unresolvable atomic lines: Application to a precise measurement of the Li-6,Li-7 D-2 lines}, journal = {Phys. Rev. A}, volume = {87}, number = {3}, year = {2013}, month = {MAR 7}, issn = {1050-2947}, doi = {10.1103/PhysRevA.87.032504}, author = {Roger C Brown and Wu, Saijun and J V Porto and Sansonetti, Craig J. and C E Simien and Brewer, Samuel M. and Tan, Joseph N. and J D Gillaspy} } @article {1944, title = {Quantum-Dot-Based Resonant Exchange Qubit}, journal = {Phys. Rev. Lett.}, volume = {111}, year = {2013}, month = {Jul}, pages = {050501}, doi = {10.1103/PhysRevLett.111.050501}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.111.050501}, author = {J Medford and J Beil and Jacob M Taylor and E I Rashba and H Lu and A C Gossard and Charles M Marcus} } @article { ISI:000322374300050, title = {Reply to Comment on "Experimental Test of an Event-Based Corpuscular Model Modification as an Alternative to Quantum Mechanics{\textquoteright}{\textquoteright}}, journal = {J. Phys. Soc. Jpn.}, volume = {82}, number = {8}, year = {2013}, month = {AUG}, issn = {0031-9015}, doi = {10.7566/JPSJ.82.086002}, author = {Giorgio Brida and Ivo P Degiovanni and Marco Genovese and Alan L Migdall and Fabrizio Piacentini and Sergey V Polyakov and Traina, Paolo} } @article {2324, title = {Restoring phase coherence in a one-dimensional superconductor using power-law electron hopping}, journal = {Physical Review B}, volume = {88}, year = {2013}, month = {10/8/2013}, pages = {134506}, abstract = {In a one-dimensional (1D) superconductor, zero-temperature quantum fluctuations destroy phase coherence. Here we put forward a mechanism which can restore phase coherence: power-law hopping. We study a 1D attractive-U Hubbard model with power-law hopping using Abelian bosonization and density-matrix renormalization group (DMRG) techniques. The parameter that controls the hopping decay acts as the effective, noninteger spatial dimensionality d(eff). For real-valued hopping amplitudes we identify analytically a range of parameters for which power-law hopping suppresses fluctuations and restores superconducting long-range order for any d(eff) \> 1, at zero temperature. A detailed DMRG analysis fully supports these findings. These results are also of direct relevance to quantum magnetism as our model can be mapped onto an S = 1/2 XXZ spin chain with power-law decaying couplings, which can be studied experimentally with cold-ion-trap techniques.

}, keywords = {1D Superconductor, Phase Coherence, Power-Law Hopping}, doi = {10.1103/PhysRevB.88.134506}, url = {http://prb.aps.org/abstract/PRB/v88/i13/e134506}, author = {Alejandro M Lobos and Masaki Tezuka and Antonio M Garcia-Garcia} } @article {2318, title = {Rotation of the noise ellipse for squeezed vacuum light generated via four-wave mixing}, journal = {Phys. Rev. A}, volume = {88}, year = {2013}, month = {10/23/2013}, pages = {043836}, abstract = {We report the generation of a squeezed vacuum state of light whose noise ellipse rotates as a function of the detection frequency. The squeezed state is generated via a four-wave mixing process in a vapor of Rb-85. We observe that rotation varies with experimental parameters such as pump power and laser detunings. We use a theoretical model based on the Heisenberg-Langevin formalism to describe this effect. Our model can be used to investigate the parameter space and potentially to tailor the ellipse rotation in order to obtain an optimum squeezing angle, for example, for coupling to an interferometer whose optimal noise quadrature varies with frequency.

}, doi = {10.1103/PhysRevA.88.043836 }, url = {http://pra.aps.org/abstract/PRA/v88/i4/e043836}, author = {Neil V Corzo and Quentin Glorieux and Alberto M Marino and Jeremy B Clark and Ryan T Glasser and Paul D Lett} } @article { ISI:000313006100019, title = {Scaling of the Low-Energy Structure in Above-Threshold Ionization in the Tunneling Regime: Theory and Experiment}, journal = {PHYSICAL REVIEW LETTERS}, volume = {110}, number = {1}, year = {2013}, month = {JAN 2}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.110.013001}, author = {Guo, L. and Han, S. S. and Liu, X. and Cheng, Y. and Xu, Z. Z. and J. Fan and Chen, J. and Chen, S. G. and Becker, W. and Blaga, C. I. and DiChiara, A. D. and Sistrunk, E. and Agostini, P. and DiMauro, L. F.} } @article { ISI:000327149100008, title = {Scattering lengths in isotopologues of the RbYb system}, journal = {PHYSICAL REVIEW A}, volume = {88}, number = {5}, year = {2013}, month = {NOV 20}, issn = {1050-2947}, doi = {10.1103/PhysRevA.88.052708}, author = {Borkowski, Mateusz and Zuchowski, Piotr S. and Ciurylo, Roman and Julienne, Paul S. and Kedziera, Dariusz and Mentel, Lukasz and Tecmer, Pawel and Muenchow, Frank and Bruni, Cristian and Goerlitz, Axel} } @article { ISI:000324172800014, title = {Self-consistent measurement and state tomography of an exchange-only spin qubit}, journal = {Nat. Nano.}, volume = {8}, number = {9}, year = {2013}, month = {SEP}, pages = {654}, issn = {1748-3387}, doi = {10.1038/NNANO.2013.168}, author = {J Medford and J Beil and Jacob M Taylor and S D Bartlett and A C Doherty and E I Rashba and D P DiVincenzo and H Lu and A C Gossard and Charles M Marcus} } @article {1650, title = {Spatially addressable readout and erasure of an image in a gradient echo memory}, journal = {New J. Phys.}, volume = {15}, year = {2013}, month = {03/2013}, pages = {035005}, keywords = {Single Fellow}, url = {http://iopscience.iop.org/1367-2630/15/3/035005}, author = {Jeremy B Clark and Quentin Glorieux and Paul D Lett} } @article { ISI:000321752400022, title = {Spinor Dynamics in an Antiferromagnetic Spin-1 Thermal Bose Gas}, journal = {Phys. Rev. Lett.}, volume = {111}, number = {2}, year = {2013}, month = {JUL 9}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.111.025301}, author = {H K Pechkis and J P Wrubel and Arne Schwettmann and P F Griffin and Ryan Barnett and Eite Tiesinga and Paul D Lett} } @article {Galitski2013, title = {Spin-orbit coupling in quantum gases}, journal = {Nature}, volume = {494}, number = {7435}, year = {2013}, pages = {49}, publisher = {Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.}, abstract = {Spin-orbit coupling links a particle{\textquoteright}s velocity to its quantum-mechanical spin, and is essential in numerous condensed matter phenomena, including topological insulators and Majorana fermions. In solid-state materials, spin-orbit coupling originates from the movement of electrons in a crystal{\textquoteright}s intrinsic electric field, which is uniquely prescribed in any given material. In contrast, for ultracold atomic systems, the engineered {\textquoteright}material parameters{\textquoteright} are tunable: a variety of synthetic spin-orbit couplings can be engineered on demand using laser fields. Here we outline the current experimental and theoretical status of spin-orbit coupling in ultracold atomic systems, discussing unique features that enable physics impossible in any other known setting.

}, keywords = {CMAMO, Multiple Fellows}, issn = {1476-4687}, doi = {10.1038/nature11841}, url = {http://dx.doi.org/10.1038/nature11841}, author = {Victor M Galitski and Ian B Spielman} } @article {2319, title = {Spontaneous emission enhancement and saturable absorption of colloidal quantum dots coupled to photonic crystal cavity}, journal = {Optics Express}, volume = {21}, year = {2013}, month = {12/2/2013}, pages = {029612}, abstract = {We demonstrate spontaneous emission rate enhancement and saturable absorption of cadmium selenide colloidal quantum dots coupled to a nanobeam photonic crystal cavity. We perform time-resolved lifetime measurements and observe an average enhancement of 4.6 for the spontaneous emission rate of quantum dots located at the cavity as compared to those located on an unpatterned surface. We also demonstrate that the cavity linewidth narrows with increasing pump intensity due to quantum dot saturable absorption.\

}, keywords = {All-optical switch, Bistability, Fluorescence, Microcavity, Nanobeam Cavities, Nanocavities, Nanocrystals, Optomechanical Cavity, Semiconductors}, doi = {10.1364/OE.21.029612}, url = {http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-24-29612}, author = {Shilpi Gupta and Edo Waks} } @article { ISI:000318151600084, title = {Storage and retrieval of collective excitations on a long-lived spin transition in a rare-earth ion-doped crystal}, journal = {OPTICS EXPRESS}, volume = {21}, number = {8}, year = {2013}, month = {APR 22}, pages = {10087-10094}, issn = {1094-4087}, doi = {10.1364/OE.21.010087}, author = {Goldschmidt, E. A. and Beavan, S. E. and Polyakov, S. V. and Migdall, A. L. and Sellars, M. J.} } @article {2163, title = {Sub-Doppler cooling of neutral atoms in a grating magneto-optical trap}, journal = {JOSA B}, volume = {30}, year = {2013}, pages = {2869}, doi = {http://dx.doi.org/10.1364/JOSAB.30.002869}, url = {http://www.opticsinfobase.org/josab/abstract.cfm?uri=josab-30-11-2869}, author = {J Lee and Grover, J. A. and Luis A Orozco and Steven L Rolston} } @article { ISI:000320949600003, title = {Topological Floquet spectrum in three dimensions via a two-photon resonance}, journal = {Phys. Rev. B}, volume = {87}, number = {23}, year = {2013}, month = {JUN 24}, issn = {1098-0121}, doi = {10.1103/PhysRevB.87.235131}, author = {Lindner, Netanel H. and Doron L. Bergman and Refael, Gil and Victor M Galitski} } @article {ISI:000313157100005, title = {Topological superconductivity and Majorana fermions in hybrid structures involving cuprate high-T-c superconductors}, journal = {Phys. Rev. B}, volume = {87}, number = {1}, year = {2013}, month = {jan}, pages = {014504}, keywords = {Multiple Fellows}, issn = {1098-0121}, doi = {10.1103/PhysRevB.87.014504}, author = {Takei, So and Benjamin M Fregoso and Victor M Galitski and S. Das Sarma} } @article {ISI:000319019300001, title = {Topological Zero-Energy Modes in Gapless Commensurate Aubry-Andre-Harper Models}, journal = {Phys. Rev. Lett.}, volume = {110}, number = {18}, year = {2013}, month = {may}, pages = {180403}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.110.180403}, author = {Ganeshan, Sriram and Kai Sun and S. Das Sarma} } @article { ISI:000309102300001, title = {Advanced detection of information in optical pulses with negative group velocity}, journal = {PHYSICAL REVIEW A}, volume = {86}, number = {3}, year = {2012}, month = {SEP 25}, issn = {1050-2947}, doi = {10.1103/PhysRevA.86.031806}, author = {Vogl, Ulrich and Glasser, Ryan T. and Lett, Paul D.} } @article { ISI:000308528200001, title = {Braiding statistics approach to symmetry-protected topological phases}, journal = {PHYSICAL REVIEW B}, volume = {86}, number = {11}, year = {2012}, month = {SEP 10}, issn = {1098-0121}, doi = {10.1103/PhysRevB.86.115109}, author = {Levin, Michael and Gu, Zheng-Cheng} } @article { ISI:000305739000006, title = {Detecting d-wave pairing and collective modes in fermionic condensates with Bragg scattering}, journal = {PHYSICAL REVIEW A}, volume = {85}, number = {6}, year = {2012}, month = {JUN 27}, issn = {1050-2947}, doi = {10.1103/PhysRevA.85.063619}, author = {Boyd, G. R. and Victor M Galitski and Yakovenko, V. M.} } @article { ISI:000309384500003, title = {Driven-dissipative dynamics of a strongly interacting Rydberg gas}, journal = {PHYSICAL REVIEW A}, volume = {86}, number = {4}, year = {2012}, month = {OCT 2}, issn = {1050-2947}, doi = {10.1103/PhysRevA.86.043403}, author = {Glaetzle, A. W. and Nath, R. and Zhao, B. and Pupillo, G. and Zoller, P.} } @article {2556, title = {Entanglement dynamics in a non-Markovian environment: An exactly solvable model}, journal = {PHYSICAL REVIEW B}, volume = {85}, year = {2012}, month = {MAY 22}, pages = {174304}, issn = {1098-0121}, doi = {10.1103/PhysRevB.85.174304}, author = {Wilson, Justin H. and Fregoso, Benjamin M. and Victor M Galitski} } @article {2539, title = {Exotic Quantum Spin Models in Spin-Orbit-Coupled Mott Insulators}, journal = {PHYSICAL REVIEW LETTERS}, volume = {109}, year = {2012}, month = {AUG 20}, pages = {085303}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.109.085303}, author = {Radic, J. and Di Ciolo, A. and Sun, K. and Victor M Galitski} } @article { ISI:000309955100085, title = {Extending single-photon optimized superconducting transition edge sensors beyond the single-photon counting regime}, journal = {OPTICS EXPRESS}, volume = {20}, number = {21}, year = {2012}, month = {OCT 8}, pages = {23798-23810}, issn = {1094-4087}, doi = {10.1364/OE.20.023798}, author = {Gerrits, Thomas and Calkins, Brice and Tomlin, Nathan and Lita, Adriana E. and Alan Migdall and Mirin, Richard and Nam, Sae Woo} } @article {2544, title = {Extracting spatial information from noise measurements of multi-spatial-mode quantum states}, journal = {EUROPEAN PHYSICAL JOURNAL D}, volume = {66}, year = {2012}, month = {NOV}, pages = {288}, issn = {1434-6060}, doi = {10.1140/epjd/e2012-30037-1}, author = {Marino, A. M. and Clark, J. B. and Glorieux, Q. and Lett, P. D.} } @article { ISI:000311967000012, title = {An extremely low-noise heralded single-photon source: A breakthrough for quantum technologies}, journal = {APPLIED PHYSICS LETTERS}, volume = {101}, number = {22}, year = {2012}, month = {NOV 26}, issn = {0003-6951}, doi = {10.1063/1.4768288}, author = {Brida, G. and Degiovanni, I. P. and Genovese, M. and Piacentini, F. and Traina, P. and Della Frera, A. and Tosi, A. and Shehata, A. Bahgat and Scarcella, C. and Gulinatti, A. and Ghioni, M. and Polyakov, S. V. and Migdall, A. and Giudice, A.} } @article { ISI:000312486800001, title = {Generation of pulsed bipartite entanglement using four-wave mixing}, journal = {NEW JOURNAL OF PHYSICS}, volume = {14}, year = {2012}, month = {DEC 14}, issn = {1367-2630}, doi = {10.1088/1367-2630/14/12/123024}, author = {Glorieux, Quentin and Clark, Jeremy B. and Corzo, Neil V. and Lett, Paul D.} } @article {Takei2012, title = {Low-density molecular gas of tightly bound Rashba-Dresselhaus fermions}, journal = {Phys. Rev. A}, volume = {85}, number = {2}, year = {2012}, month = {feb}, pages = {023626}, keywords = {Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v85/i2/e023626}, author = {Takei, So and Chien-Hung Lin and Brandon M Anderson and Victor M Galitski} } @article { ISI:000305032100003, title = {Measurements of Quasiparticle Tunneling Dynamics in a Band-Gap-Engineered Transmon Qubit}, journal = {PHYSICAL REVIEW LETTERS}, volume = {108}, number = {23}, year = {2012}, month = {JUN 8}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.108.230509}, author = {Sun, L. and DiCarlo, L. and Reed, M. D. and Catelani, G. and Bishop, Lev S. and Schuster, D. I. and Johnson, B. R. and Yang, Ge A. and Frunzio, L. and Glazman, L. and Devoret, M. H. and Schoelkopf, R. J.} } @article { ISI:000308001700002, title = {Microscopic theory for a ferromagnetic nanowire/superconductor heterostructure: Transport, fluctuations, and topological superconductivity}, journal = {PHYSICAL REVIEW B}, volume = {86}, number = {5}, year = {2012}, month = {AUG 28}, issn = {1098-0121}, doi = {10.1103/PhysRevB.86.054521}, author = {Takei, So and Victor M Galitski} } @article { ISI:000311320100013, title = {Optical logic gates using coherent feedback}, journal = {APPLIED PHYSICS LETTERS}, volume = {101}, number = {19}, year = {2012}, month = {NOV 5}, issn = {0003-6951}, doi = {10.1063/1.4767133}, author = {Zhou, Zhifan and Liu, Cunjin and Fang, Yami and Zhou, Jun and Glasser, Ryan T. and Chen, Liqing and Jing, Jietai and Zhang, Weiping} } @article {Barnett2012, title = {Order by disorder in spin-orbit-coupled Bose-Einstein condensates}, journal = {Phys. Rev. A}, volume = {85}, number = {2}, year = {2012}, month = {feb}, pages = {023615}, keywords = {Single Fellow}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v85/i2/e023615}, author = {Ryan Barnett and Powell, Stephen and Gra{\ss}, Tobias and Maciej Lewenstein and S. Das Sarma} } @article {2543, title = {Quantum phases of hard-core bosons in a frustrated honeycomb lattice}, journal = {NEW JOURNAL OF PHYSICS}, volume = {14}, year = {2012}, month = {NOV 29}, pages = {115028}, issn = {1367-2630}, doi = {10.1088/1367-2630/14/11/115028}, author = {Varney, C. N. and Sun, K. and Victor M Galitski and Rigol, M.} } @article {2540, title = {Quantum simulation of spin models on an arbitrary lattice with trapped ions}, journal = {NEW JOURNAL OF PHYSICS}, volume = {14}, year = {2012}, month = {SEP 27}, pages = {095024}, issn = {1367-2630}, doi = {10.1088/1367-2630/14/9/095024}, author = {Korenblit, S. and D. Kafri and Campbell, W. C. and Islam, R. and Edwards, E. E. and Gong, Z-X and Lin, G-D and Duan, L-M and Kim, J. and Kim, K. and C. Monroe} } @article { ISI:000299889600002, title = {Resistivity saturation in a weakly interacting two-dimensional Fermi liquid at intermediate temperatures}, journal = {PHYSICAL REVIEW B}, volume = {85}, number = {4}, year = {2012}, month = {JAN 26}, issn = {1098-0121}, doi = {10.1103/PhysRevB.85.041310}, author = {Zhou, Xiaoqing and Schmidt, B. and Engel, L. W. and Gervais, G. and Pfeiffer, L. N. and West, K. W. and S. Das Sarma} } @article { ISI:000301476700002, title = {Squeezed noise due to two-level system defects in superconducting resonator circuits}, journal = {PHYSICAL REVIEW B}, volume = {85}, number = {10}, year = {2012}, month = {MAR 14}, issn = {1098-0121}, doi = {10.1103/PhysRevB.85.104507}, author = {Takei, So and Victor M Galitski and Osborn, Kevin D.} } @article {2416, title = {Stimulated Generation of Superluminal Light Pulses via Four-Wave Mixing}, journal = {Phys. Rev. Lett.}, volume = {108}, year = {2012}, month = {4/2012}, pages = {173902}, doi = {10.1103/PhysRevLett.108.173902}, author = {Ryan T Glasser and Vogl, Ulrich and Paul D Lett} } @article {ISI:000312012200026, title = {SU(3) Spin-Orbit Coupling in Systems of Ultracold Atoms}, journal = {Phys. Rev. Lett.}, volume = {109}, number = {23}, year = {2012}, month = {dec}, pages = {235308}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.109.235308}, author = {Ryan Barnett and Boyd, G R and Victor M Galitski} } @article { ISI:000304806100008, title = {Synthetic 3D Spin-Orbit Coupling}, journal = {PHYSICAL REVIEW LETTERS}, volume = {108}, number = {23}, year = {2012}, month = {JUN 5}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.108.235301}, author = {Anderson, Brandon M. and Juzeliunas, Gediminas and Victor M Galitski and Ian B Spielman} } @article {ISI:000304403100079, title = {Temporally multiplexed storage of images in a gradient echo memory}, journal = {Optics Express}, volume = {20}, number = {11}, year = {2012}, month = {may}, pages = {12350}, abstract = {We study the storage and retrieval of images in a hot atomic vapor using the gradient echo memory protocol. We demonstrate that this technique allows for the storage of multiple spatial modes. We study both spatial and temporal multiplexing by storing a sequence of two different images in the atomic vapor. The effect of atomic diffusion on the spatial resolution is discussed and characterized experimentally. For short storage time a normalized spatial cross-correlation between a retrieved image and its input of 88 \% is reported. (C) 2012 Optical Society of America

}, keywords = {Single Fellow}, issn = {1094-4087}, author = {Quentin Glorieux and Jeremy B Clark and Alberto M Marino and Zhou, Zhifan and Paul D Lett} } @article {Dzero2012, title = {Theory of topological Kondo insulators}, journal = {Phys. Rev. B}, volume = {85}, number = {4}, year = {2012}, month = {jan}, pages = {045130}, keywords = {2012}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v85/i4/e045130}, author = {Maxim Dzero and Kai Sun and Coleman, Piers and Victor M Galitski} } @article {ISI:000312834100003, title = {Topological flat band models with arbitrary Chern numbers}, journal = {Phys. Rev. B}, volume = {86}, number = {24}, year = {2012}, month = {dec}, pages = {241112}, issn = {1098-0121}, doi = {10.1103/PhysRevB.86.241112}, author = {Yang, Shuo and Zheng-Cheng Gu and Kai Sun and S. Das Sarma} } @article { ISI:000304479900002, title = {Two-component Coulomb glass in insulators with a local attraction}, journal = {PHYSICAL REVIEW B}, volume = {85}, number = {19}, year = {2012}, month = {MAY 25}, issn = {1098-0121}, doi = {10.1103/PhysRevB.85.195141}, author = {Mitchell, Joe and Gangopadhyay, Anirban and Victor M Galitski and Mueller, Markus} } @article {Li2011, title = {Anisotropic surface transport in topological insulators in proximity to a helical spin density wave}, journal = {Phys. Rev. B}, volume = {83}, number = {8}, year = {2011}, month = {feb}, pages = {085110}, keywords = {Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v83/i8/e085110}, author = {Li, Qiuzi and Ghosh, Parag and Jay D Sau and Tewari, Sumanta and S. Das Sarma} } @article {Wilson2011, title = {Breakdown of the Coherent State Path Integral: Two Simple Examples}, journal = {Phys. Rev. Lett.}, volume = {106}, number = {11}, year = {2011}, month = {mar}, pages = {110401}, keywords = {2011, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v106/i11/e110401}, author = {Justin H Wilson and Victor M Galitski} } @article {Robertson2011, title = {Dynamic Stimulation of Quantum Coherence in Systems of Lattice Bosons}, journal = {Phys. Rev. Lett.}, volume = {106}, number = {16}, year = {2011}, month = {apr}, pages = {165701}, keywords = {2011, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v106/i16/e165701}, author = {Robertson, Andrew and Victor M Galitski and Refael, Gil} } @article {Brida2011, title = {Experimental realization of a low-noise heralded single-photon source}, journal = {Optics Express}, volume = {19}, number = {2}, year = {2011}, month = {jan}, pages = {1484}, publisher = {OSA}, abstract = {We present a heralded single-photon source with a much lower level of unwanted background photons in the output channel by using the herald photon to control a shutter in the heralded channel. The shutter is implemented using a simple field programable gate array controlled optical switch.}, keywords = {2011, Quantum information and processing, Quantum optics, Single Fellow}, issn = {1094-4087}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-19-2-1484}, author = {Giorgio Brida and Ivo P Degiovanni and Marco Genovese and Alan L Migdall and Fabrizio Piacentini and Sergey V Polyakov and I Ruo Berchera} } @article {Lindner2011, title = {Floquet topological insulator in semiconductor quantum wells}, journal = {Nat. Phys.}, volume = {7}, number = {6}, year = {2011}, month = {mar}, pages = {490{\textendash}495}, publisher = {Nature Publishing Group}, keywords = {2011, Single Fellow}, issn = {1745-2473}, doi = {10.1038/nphys1926}, author = {Lindner, Netanel H. and Refael, Gil and Victor M Galitski} } @article {2457, title = {Fractional quantum Hall effect in the absence of Landau levels}, journal = {Nature Communications}, volume = {2}, year = {2011}, month = {7/2011}, pages = {389}, doi = {10.1038/ncomms1380}, author = {Dong Sheng and Zheng-Cheng Gu and Kai Sun and L. Sheng} } @article { ISI:000293702200001, title = {Gutzwiller-projected wave functions for the pseudogap state of underdoped high-temperature superconductors}, journal = {PHYSICAL REVIEW B}, volume = {84}, number = {6}, year = {2011}, month = {AUG 9}, issn = {1098-0121}, doi = {10.1103/PhysRevB.84.060503}, author = {Sensarma, Rajdeep and Victor M Galitski} } @article {Anderson2011, title = {Interferometry with synthetic gauge fields}, journal = {Phys. Rev. A}, volume = {83}, number = {3}, year = {2011}, month = {mar}, pages = {031602}, keywords = {2011, CMAMO, Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v83/i3/e031602}, author = {Brandon M Anderson and Jacob M Taylor and Victor M Galitski} } @article {Varney2011, title = {Kaleidoscope of Exotic Quantum Phases in a Frustrated XY Model}, journal = {Phys. Rev. Lett.}, volume = {107}, number = {7}, year = {2011}, month = {aug}, pages = {077201}, keywords = {Multiple JQI Affil., Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v107/i7/e077201}, author = {Varney, Christopher and Kai Sun and Victor M Galitski and Rigol, Marcos} } @article {Sedrakyan2011, title = {Majorana path integral for nonequilibrium dynamics of two-level systems}, journal = {Phys. Rev. B}, volume = {83}, number = {13}, year = {2011}, month = {apr}, pages = {134303}, keywords = {2011, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v83/i13/e134303}, author = {Tigran Sedrakyan and Victor M Galitski} } @article {Sun2011a, title = {Nearly Flatbands with Nontrivial Topology}, journal = {Phys. Rev. Lett.}, volume = {106}, number = {23}, year = {2011}, month = {jun}, pages = {236803}, keywords = {2011, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v106/i23/e236803}, author = {Kai Sun and Zheng-Cheng Gu and Katsura, Hosho and S. Das Sarma} } @article {Cheng2011, title = {Nonadiabatic effects in the braiding of non-Abelian anyons in topological superconductors}, journal = {Phys. Rev. B}, volume = {84}, number = {10}, year = {2011}, month = {sep}, pages = {104529}, keywords = {2011, Multiple Fellows}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v84/i10/e104529}, author = {Cheng, Meng and Victor M Galitski and S. Das Sarma} } @article { ISI:000297795900001, title = {Observation of High Coherence in Josephson Junction Qubits Measured in a Three-Dimensional Circuit QED Architecture}, journal = {PHYSICAL REVIEW LETTERS}, volume = {107}, number = {24}, year = {2011}, month = {DEC 5}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.107.240501}, author = {Paik, Hanhee and Schuster, D. I. and Bishop, Lev S. and Kirchmair, G. and Catelani, G. and Sears, A. P. and Johnson, B. R. and Reagor, M. J. and Frunzio, L. and Glazman, L. I. and Girvin, S. M. and Devoret, M. H. and Schoelkopf, R. J.} } @article {Varney2011, title = {Publisher{\textquoteright}s Note: Kaleidoscope of Exotic Quantum Phases in a Frustrated XY Model [Phys. Rev. Lett. 107, 077201 (2011)]}, journal = {Phys. Rev. Lett.}, volume = {107}, number = {7}, year = {2011}, month = {aug}, pages = {077201}, keywords = {2011, Multiple JQI Affil., Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v107/i8/e089902 http://prl.aps.org/abstract/PRL/v107/i7/e077201}, author = {Varney, Christopher and Kai Sun and Victor M Galitski and Rigol, Marcos} } @article { ISI:000293921000017, title = {Quantum-Classical Crossover and Apparent Metal-Insulator Transition in a Weakly Interacting 2D Fermi Liquid}, journal = {PHYSICAL REVIEW LETTERS}, volume = {107}, number = {8}, year = {2011}, month = {AUG 16}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.107.086804}, author = {Zhou, Xiaoqing and Schmidt, B. and Proust, C. and Gervais, G. and Pfeiffer, L. N. and West, K. W. and S. Das Sarma} } @article { ISI:000293126900002, title = {Quantum-to-classical correspondence and Hubbard-Stratonovich dynamical systems: A Lie-algebraic approach}, journal = {PHYSICAL REVIEW A}, volume = {84}, number = {1}, year = {2011}, month = {JUL 26}, issn = {1050-2947}, doi = {10.1103/PhysRevA.84.012118}, author = {Victor M Galitski} } @article {Baumer2011, title = {Spatial separation in a thermal mixture of ultracold \^\174\Yb and \^\87\Rb atoms}, journal = {Phys. Rev. A}, volume = {83}, number = {4}, year = {2011}, month = {apr}, pages = {040702}, keywords = {2011}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v83/i4/e040702}, author = {F Baumer and M{\"u}nchow, F. and G{\"o}rlitz, A. and Maxwell, S. and Paul S Julienne and Eite Tiesinga} } @article {Kim2011b, title = {Thin-film superconducting resonator tunable to the ground-state hyperfine splitting of 87Rb}, journal = {AIP Advances}, volume = {1}, number = {4}, year = {2011}, month = {oct}, pages = {042107}, keywords = {2011, electron beam lithography, ground states, inductance, Multiple Fellows, niobium, superconducting microwave devices, superconducting resonators, superconducting thin films, type II superconductors}, issn = {21583226}, url = {http://link.aip.org/link/?AAIDBI/1/042107/1}, author = {Kim, Z. and Vlahacos, C. P. and Jonathan E Hoffman and Grover, J. A. and Voigt, K. D. and Benjamin K Cooper and Ballard, C. J. and B S Palmer and Mohammad Hafezi and Jacob M Taylor and Jeffrey R Anderson and Dragt, A. J. and Christopher J Lobb and Luis A Orozco and Steven L Rolston and F C Wellstood} } @article {Varney2011a, title = {Topological phase transitions for interacting finite systems}, journal = {Phys. Rev. B}, volume = {84}, number = {24}, year = {2011}, month = {dec}, pages = {241105}, keywords = {2011, Multiple JQI Affil., Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v84/i24/e241105}, author = {Varney, Christopher and Kai Sun and Rigol, Marcos and Victor M Galitski} } @article {Berninger2011, title = {Universality of the Three-Body Parameter for Efimov States in Ultracold Cesium}, journal = {Phys. Rev. Lett.}, volume = {107}, number = {12}, year = {2011}, month = {sep}, pages = {120401}, keywords = {2011}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v107/i12/e120401}, author = {Martin Berninger and Alessandro Zenesini and Bo Huang and Walter Harm and N{\"a}gerl, H.-C. and Francesca Ferlaino and Rudolf Grimm and Paul S Julienne and Jeremy M Hutson} } @article {Artuso2011, title = {Using local fields to tailor hybrid quantum-dot/metal nanoparticle systems}, journal = {Phys. Rev. B}, volume = {83}, number = {23}, year = {2011}, month = {jun}, pages = {235406}, keywords = {2011}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v83/i23/e235406}, author = {Ryan D Artuso and Garnett W Bryant and Garcia-Etxarri, Aitzol and Javier Aizpurua} } @article {Radic2011, title = {Vortices in spin-orbit-coupled Bose-Einstein condensates}, journal = {Phys. Rev. A}, volume = {84}, number = {6}, year = {2011}, month = {dec}, pages = {063604}, keywords = {2011, CMAMO, Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v84/i6/e063604}, author = {Juraj Radi{\'c} and Tigran Sedrakyan and Ian B Spielman and Victor M Galitski} } @article { ISI:000284792600001, title = {The 2010 Nobel Prize in Physics (Reprinted from Solid State Communications, vol 143, pg 1-2, 2007)}, journal = {SOLID STATE COMMUNICATIONS}, volume = {150}, number = {45-46}, year = {2010}, month = {DEC}, pages = {2207-2208}, issn = {0038-1098}, doi = {10.1016/j.ssc.2010.10.014}, author = {S. Das Sarma and Geim, Andre K. and Kim, Philip and MacDonald, Allan H.} } @article {Sedrakyan2010, title = {Boundary Wess-Zumino-Novikov-Witten model from the pairing Hamiltonian}, journal = {Phys. Rev. B}, volume = {82}, number = {21}, year = {2010}, month = {dec}, keywords = {2010, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v82/i21/e214502}, author = {Tigran Sedrakyan and Victor M Galitski} } @article {Anderson2010, title = {Bulk manifestation of the spin Hall effect}, journal = {Phys. Rev. B}, volume = {81}, number = {12}, year = {2010}, month = {mar}, keywords = {2010, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v81/i12/e121304}, author = {Brandon M Anderson and Tudor D Stanescu and Victor M Galitski} } @article { ISI:000278150100050, title = {Colossal Magnetoresistance in an Ultraclean Weakly Interacting 2D Fermi Liquid}, journal = {PHYSICAL REVIEW LETTERS}, volume = {104}, number = {21}, year = {2010}, month = {MAY 28}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.104.216801}, author = {Zhou, Xiaoqing and Piot, B. A. and Bonin, M. and Engel, L. W. and S. Das Sarma and Gervais, G. and Pfeiffer, L. N. and West, K. W.} } @article { ISI:000282270000007, title = {Energy gap and spin polarization in the 5/2 fractional quantum Hall effect}, journal = {PHYSICAL REVIEW B}, volume = {82}, number = {11}, year = {2010}, month = {SEP 29}, issn = {1098-0121}, doi = {10.1103/PhysRevB.82.115330}, author = {S. Das Sarma and Gervais, G. and Zhou, Xiaoqing} } @article {Pearlman2010, title = {Enhancing image contrast using coherent states and photon number resolving detectors}, journal = {Optics Express}, volume = {18}, number = {6}, year = {2010}, month = {mar}, pages = {6033}, publisher = {OSA}, abstract = {We experimentally map the transverse profile of diffractionlimited beams using photon-number-resolving detectors.We observe strong compression of diffracted beam profiles for high detected photon number. This effect leads to higher contrast than a conventional irradiance profile between two Airy disk-beams separated by the Rayleigh criterion.}, keywords = {2010, Photon counting, Photon statistics}, issn = {1094-4087}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-18-6-6033}, author = {Aaron J Pearlman and Alexander Ling and Elizabeth A Goldschmidt and Christoph F Wildfeuer and Jingyun Fan and Alan L Migdall} } @article {Gangopadhyay2010, title = {Exact solution for quantum dynamics of a periodically driven two-level system}, journal = {Phys. Rev. B}, volume = {82}, number = {2}, year = {2010}, month = {jul}, pages = {024303}, keywords = {2010, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v82/i2/e024303}, author = {Gangopadhyay, Anirban and Maxim Dzero and Victor M Galitski} } @article {Galitski2010, title = {Fermionization transform for certain higher-dimensional quantum spin models}, journal = {Phys. Rev. B}, volume = {82}, number = {6}, year = {2010}, month = {aug}, pages = {060411}, keywords = {2010, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v82/i6/e060411}, author = {Victor M Galitski} } @article {Gerrits2010, title = {Generation of optical coherent-state superpositions by number-resolved photon subtraction from the squeezed vacuum}, journal = {Phys. Rev. A}, volume = {82}, number = {3}, year = {2010}, month = {sep}, keywords = {2010, Single Fellow}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v82/i3/e031802}, author = {Gerrits, Thomas and Glancy, Scott and Clement, Tracy and Calkins, Brice and Adriana E Lita and Miller, Aaron and Alan L Migdall and Sae Woo Nam and Mirin, Richard and Knill, Emanuel} } @article {Restelli2010, title = {Improved Timing Resolution Single-Photon Detectors in Daytime Free-Space Quantum Key Distribution With 1.25 GHz Transmission Rate}, journal = {Selected Topics in Quantum Electronics, IEEE Journal of}, volume = {16}, number = {5}, year = {2010}, month = {sep}, pages = {1084{\textendash}1090}, abstract = {In free-space single-photon quantum key distribution (QKD), the error rate due to daytime background photons can be reduced with strong temporal filtering. In this case, the improvement in performance is determined by the receiver{\textquoteright}s ability to resolve signal-photon arrival times. We use fast clock recovery and commercially available single-photon detectors with timing resolution enhanced by additional electronic circuitry to implement temporal gating down to 50 ps in a free-space QKD system. The single-photon channel operates at 850 nm, and the improved timing resolution enables transmission rates of 1.25 GHz. We observe daytime quantum bit error rates of 0.04, which is less than one-third of the ungated error rate. We present the design and performance of the system and demonstrate its benefit to free-space QKD.

}, keywords = {2010}, issn = {1077-260X}, url = {http://ieeexplore.ieee.org/xpl/freeabs\_all.jsp?arnumber=5433021}, author = {Restelli, Alessandro and Bienfang, Joshua C. and Charles W Clark and Rech, Ivan and Labanca, Ivan and Ghioni, Massimo and Cova, Sergio} } @article {Varney2010, title = {Interaction effects and quantum phase transitions in topological insulators}, journal = {Phys. Rev. B}, volume = {82}, number = {11}, year = {2010}, month = {sep}, keywords = {2010, Multiple JQI Affil., Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v82/i11/e115125}, author = {Varney, Christopher and Kai Sun and Rigol, Marcos and Victor M Galitski} } @article { ISI:000286756300001, title = {Lifetime of double occupancies in the Fermi-Hubbard model}, journal = {PHYSICAL REVIEW B}, volume = {82}, number = {22}, year = {2010}, month = {DEC 3}, issn = {1098-0121}, doi = {10.1103/PhysRevB.82.224302}, author = {Sensarma, Rajdeep and Pekker, David and Altman, Ehud and Demler, Eugene and Strohmaier, Niels and Greif, Daniel and Joerdens, Robert and Tarruell, Leticia and Moritz, Henning and Esslinger, Tilman} } @article {Ghosh2010, title = {Non-Abelian topological order in noncentrosymmetric superconductors with broken time-reversal symmetry}, journal = {Phys. Rev. B}, volume = {82}, number = {18}, year = {2010}, month = {nov}, keywords = {2010, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v82/i18/e184525}, author = {Ghosh, Parag and Jay D Sau and Tewari, Sumanta and S. Das Sarma} } @article {Galitski2010a, title = {Nonperturbative quantum dynamics of the order parameter in the BCS pairing model}, journal = {Phys. Rev. B}, volume = {82}, number = {5}, year = {2010}, month = {aug}, pages = {054511}, keywords = {2010, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v82/i5/e054511}, author = {Victor M Galitski} } @article { ISI:000275060000055, title = {Observation of Elastic Doublon Decay in the Fermi-Hubbard Model}, journal = {PHYSICAL REVIEW LETTERS}, volume = {104}, number = {8}, year = {2010}, month = {FEB 26}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.104.080401}, author = {Strohmaier, Niels and Greif, Daniel and Jordens, Robert and Tarruell, Leticia and Moritz, Henning and Esslinger, Tilman and Sensarma, Rajdeep and Pekker, David and Altman, Ehud and Demler, Eugene} } @article {Sheng2010, title = {Preliminary studies for anapole moment measurements in rubidium and francium}, journal = {J. Phys. B: At. Mol. Opt. Phys.}, volume = {43}, number = {7}, year = {2010}, month = {apr}, pages = {074004}, abstract = {Preparations for the anapole measurement in Fr indicate the possibility of performing a similar measurement in a chain of Rb. The sensitivity analysis based on a single-nucleon model shows the potential for placing strong limits on the nucleon weak interaction parameters. There are values of the magnetic fields at much lower values than previously found that are insensitive to first-order changes in the field. The anapole moment effect in Rb corresponds to an equivalent electric field that is 80 times smaller than in Fr, but the stability of the isotopes and the current performance of the dipole trap in the apparatus presented here are encouraging for pursuing the measurement.}, keywords = {2010}, issn = {0953-4075}, url = {http://stacks.iop.org/0953-4075/43/i=7/a=074004}, author = {Dong Sheng and Luis A Orozco and Gomez, E.} } @article {2550, title = {Realistic Time-Reversal Invariant Topological Insulators with Neutral Atoms}, journal = {PHYSICAL REVIEW LETTERS}, volume = {105}, year = {2010}, month = {DEC 16}, pages = {255302}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.105.255302}, author = {N. Goldman and Satija, I. and Nikolic, P. and Bermudez, A. and Martin-Delgado, M. A. and Lewenstein, M. and Ian B Spielman} } @article { ISI:000277020600027, title = {Scattering mechanism in modulation-doped shallow two-dimensional electron gases}, journal = {APPLIED PHYSICS LETTERS}, volume = {96}, number = {16}, year = {2010}, month = {APR 19}, issn = {0003-6951}, doi = {10.1063/1.3402765}, author = {Laroche, D. and S. Das Sarma and Gervais, G. and Lilly, M. P. and Reno, J. L.} } @article {Cheng2010a, title = {Stable topological superconductivity in a family of two-dimensional fermion models}, journal = {Phys. Rev. B}, volume = {81}, number = {2}, year = {2010}, month = {jan}, keywords = {2010, Multiple Fellows}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v81/i2/e024504}, author = {Cheng, Meng and Kai Sun and Victor M Galitski and S. Das Sarma} } @article {Dzero2010, title = {Topological Kondo Insulators}, journal = {Phys. Rev. Lett.}, volume = {104}, number = {10}, year = {2010}, month = {mar}, keywords = {2010, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v104/i10/e106408}, author = {Maxim Dzero and Kai Sun and Victor M Galitski and Coleman, Piers} } @article {Stanescu2010a, title = {Topological states in two-dimensional optical lattices}, journal = {Phys. Rev. A}, volume = {82}, number = {1}, year = {2010}, month = {jul}, keywords = {2010, Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v82/i1/e013608}, author = {Tudor D Stanescu and Victor M Galitski and S. Das Sarma} } @article {Cheng2010, title = {Tunneling of anyonic Majorana excitations in topological superconductors}, journal = {Phys. Rev. B}, volume = {82}, number = {9}, year = {2010}, month = {sep}, keywords = {2010, Multiple Fellows}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v82/i9/e094504}, author = {Cheng, Meng and Roman M Lutchyn and Victor M Galitski and S. Das Sarma} } @article {Gorshkov2010, title = {Two-orbital SU(N) magnetism with ultracold alkaline-earth atoms}, journal = {Nat. Phys.}, volume = {6}, number = {4}, year = {2010}, month = {feb}, pages = {289{\textendash}295}, abstract = {Fermionic alkaline-earth atoms have unique properties that make them attractive candidates for the realization of novel atomic clocks and degenerate quantum gases. At the same time, they are attracting considerable theoretical attention in the context of quantum information processing. Here we demonstrate that when such atoms are loaded in optical lattices, they can be used as quantum simulators of unique many-body phenomena. In particular, we show that the decoupling of the nuclear spin from the electronic angular momentum can be used to implement many-body systems with an unprecedented degree of symmetry, characterized by the SU(N) group with N as large as 10. Moreover, the interplay of the nuclear spin with the electronic degree of freedom provided by a stable optically excited state allows for the study of spin-orbital physics. Such systems may provide valuable insights into strongly correlated physics of transition metal oxides, heavy fermion materials, and spin liquid phases.}, keywords = {2010}, issn = {1745-2473}, url = {http://arxiv.org/abs/0905.2610}, author = {Gorshkov, A. V. and Hermele, M. and Gurarie, V. and Xu, C. and Paul S Julienne and Jun Ye and Peter Zoller and Demler, E. and Mikhail D Lukin and A M Rey} } @article { ISI:000263389500057, title = {Giant Nernst Effect due to Fluctuating Cooper Pairs in Superconductors}, journal = {PHYSICAL REVIEW LETTERS}, volume = {102}, number = {6}, year = {2009}, month = {FEB 13}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.102.067001}, author = {Serbyn, M. N. and Skvortsov, M. A. and Varlamov, A. A. and Victor M Galitski} } @article {Brida2009a, title = {Improved implementation of the Alicki{\textendash}Van Ryn nonclassicality test for a single particle using Si detectors}, journal = {Phys. Rev. A}, volume = {79}, number = {4}, year = {2009}, month = {apr}, keywords = {2009}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v79/i4/e044102}, author = {Giorgio Brida and Ivo P Degiovanni and Marco Genovese and Fabrizio Piacentini and Valentina Schettini and Gisin, Nicolas and Sergey V Polyakov and Alan L Migdall} } @article {Rogers2009, title = {Measurement of small birefringence and loss in a nonlinear single-mode waveguide}, journal = {Rev. Sci. Instrum.}, volume = {80}, number = {5}, year = {2009}, month = {may}, pages = {053107}, abstract = {We design and fabricate a birefringent semiconductor waveguide for application to nonlinear photonics, demonstrating that it is possible to engineer a small birefringence into such a device using multiple core layers. We also demonstrate a simple technique to accurately determine small waveguide birefringence using a differential measurement, present useful methods for coupling light into and out of the device, and make estimates of coupling and linear device losses.}, keywords = {2009, birefringence, Nonlinear optics, optical design techniques, optical fabrication, optical loss measurement, optical losses, optical variables measurement, optical waveguides}, issn = {1089-7623}, url = {http://link.aip.org/link/?RSINAK/80/053107/1}, author = {Rogers, Daniel J and Richardson, Christopher J K and Goldhar, Julius and Charles W Clark} } @article { ISI:000264768900043, title = {Mott transition on a triangular lattice}, journal = {PHYSICAL REVIEW B}, volume = {79}, number = {11}, year = {2009}, month = {MAR}, issn = {1098-0121}, doi = {10.1103/PhysRevB.79.115116}, author = {Galanakis, Dimitrios and Stanescu, Tudor D. and Phillips, Philip} } @article { ISI:000273233800133, title = {Nonequilibrium enhancement of Cooper pairing in cold fermion systems}, journal = {PHYSICAL REVIEW A}, volume = {80}, number = {6}, year = {2009}, month = {DEC}, issn = {1050-2947}, doi = {10.1103/PhysRevA.80.063609}, author = {Robertson, Andrew and Victor M Galitski} } @article {Liu2009, title = {Number Fluctuations and Energy Dissipation in Sodium Spinor Condensates}, journal = {Phys. Rev. Lett.}, volume = {102}, number = {22}, year = {2009}, month = {jun}, keywords = {2009}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v102/i22/e225301}, author = {Liu, Y. and Gomez, E. and Maxwell, S. and L D Turner and Eite Tiesinga and Paul D Lett} } @article {Galitski2009, title = {Paired electron pockets in the hole-doped cuprates}, journal = {Phys. Rev. B}, volume = {79}, number = {13}, year = {2009}, month = {apr}, keywords = {2009, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v79/i13/e134512}, author = {Victor M Galitski and Sachdev, Subir} } @article { ISI:000267574300001, title = {Special Issue Recent Progress in Graphene Studies Preface}, journal = {SOLID STATE COMMUNICATIONS}, volume = {149}, number = {27-28, SI}, year = {2009}, month = {JUL}, pages = {1039-1040}, issn = {0038-1098}, doi = {10.1016/j.ssc.2009.04.009}, author = {Fal{\textquoteright}ko, Vladimir and Geim, Andre and S. Das Sarma and MacDonald, Allan and Kim, Philip} } @article {Cheng2009, title = {Splitting of Majorana-Fermion Modes due to Intervortex Tunneling in a px+ipy Superconductor}, journal = {Phys. Rev. Lett.}, volume = {103}, number = {10}, year = {2009}, month = {aug}, keywords = {2009}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v103/i10/e107001}, author = {Cheng, Meng and Roman M Lutchyn and Victor M Galitski and S. Das Sarma} } @article {Stanescu2009, title = {Topological insulators and metals in atomic optical lattices}, journal = {Phys. Rev. A}, volume = {79}, number = {5}, year = {2009}, month = {may}, pages = {053639}, keywords = {2009, CMAMO, Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v79/i5/e053639}, author = {Tudor D Stanescu and Victor M Galitski and J Vaishnav and Charles W Clark and S. Das Sarma} } @article { ISI:000260574600055, title = {Contrasting Behavior of the 5/2 and 7/3 Fractional Quantum Hall Effect in a Tilted Field}, journal = {PHYSICAL REVIEW LETTERS}, volume = {101}, number = {18}, year = {2008}, month = {OCT 31}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.101.186806}, author = {Dean, C. R. and Piot, B. A. and Hayden, P. and S. Das Sarma and Gervais, G. and Pfeiffer, L. N. and West, K. W.} } @article {Lang2008, title = {Cruising through molecular bound-state manifolds with radiofrequency}, journal = {Nat. Phys.}, volume = {4}, number = {3}, year = {2008}, month = {jan}, pages = {223{\textendash}226}, publisher = {Nature Publishing Group}, abstract = {The production of ultracold molecules with their rich internal structure is currently attracting considerable interest1, 2, 3, 4. For future experiments, it will be important to efficiently transfer these molecules from their initial internal quantum state at production to other quantum states of interest. Transfer tools such as optical Raman schemes5, 6, radiofrequency transitions (see, for example, ref.~7) or magnetic field ramping8, 9 exist, but are either technically involved or limited in their applicability. Here, we demonstrate a simple, highly efficient hybrid transfer method that overcomes a number of the previous limitations. The scheme is based on magnetically tuned mixing of two neighbouring molecular levels, which enables otherwise forbidden radiofrequency transitions between them. By repeating this process at various magnetic fields, molecules can be successively transported through a large manifold of quantum states. Applying nine transfers, we convert very weakly bound Feshbach molecules to a much more deeply bound level with a binding energy corresponding to 3.6~GHz. As an important spin-off of our experiments, we demonstrate a high-precision spectroscopy method for investigating level crossings.}, keywords = {2008, Single Fellow}, issn = {1745-2473}, url = {http://dx.doi.org/10.1038/nphys838}, author = {Lang, F. and Straten, P. v. d. and Brandst{\"a}tter, B. and Thalhammer, G. and Winkler, K. and Paul S Julienne and Rudolf Grimm and J Hecker Denschlag} } @article { ISI:000258975100038, title = {Dissipation-driven quantum phase transition in superconductor-graphene systems}, journal = {PHYSICAL REVIEW LETTERS}, volume = {101}, number = {10}, year = {2008}, month = {SEP 5}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.101.106402}, author = {Lutchyn, Roman M. and Victor M Galitski and Refael, Gil and S. Das Sarma} } @article { ISI:000258538600045, title = {Effective masses in a strongly anisotropic Fermi liquid}, journal = {PHYSICAL REVIEW LETTERS}, volume = {101}, number = {6}, year = {2008}, month = {AUG 8}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.101.066405}, author = {Stanescu, Tudor D. and Victor M Galitski and Drew, H. D.} } @article {Al-Hassanieh2008, title = {Excitons in the One-Dimensional Hubbard Model: A Real-Time Study}, journal = {Phys. Rev. Lett.}, volume = {100}, number = {16}, year = {2008}, month = {apr}, keywords = {2008, No Fellows}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v100/i16/e166403}, author = {Al-Hassanieh, K. and Reboredo, F. and Feiguin, A. and Gonz{\'a}lez, I. and Dagotto, E.} } @article {Brida2008, title = {Experimental test of nonclassicality for a single particle}, journal = {Optics Express}, volume = {16}, number = {16}, year = {2008}, month = {jul}, pages = {11750}, abstract = {In a recent paper [R. Alicki and N. Van Ryn, J. Phys. A: Math. Theor., 41, 062001 (2008)] a test of nonclassicality for a single qubit was proposed. Here, we discuss the class of local realistic theories to which this test applies and present an experimental realization.}, keywords = {2008, Single Fellow}, issn = {1094-4087}, url = {http://arxiv.org/abs/0804.1646}, author = {Giorgio Brida and Ivo P Degiovanni and Marco Genovese and Valentina Schettini and Sergey V Polyakov and Alan L Migdall} } @article {2476, title = { Experimental test of nonlocal realism using a fiber-based source of polarization-entangled photon pairs}, journal = {Phys. Rev. A}, volume = {77}, year = {2008}, month = {3/2008}, pages = {032339}, doi = {10.1103/PhysRevA.77.032339}, author = {Matthew Eisaman and Elizabeth A Goldschmidt and Jun Chen and Jingyun Fan and Alan L Migdall} } @article {Wille2008, title = {Exploring an Ultracold Fermi-Fermi Mixture: Interspecies Feshbach Resonances and Scattering Properties of Li6 and K40}, journal = {Phys. Rev. Lett.}, volume = {100}, number = {5}, year = {2008}, month = {feb}, keywords = {2008, Multiple Fellows}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v100/i5/e053201}, author = {Wille, E. and Spiegelhalder, F. and Kerner, G. and Naik, D and Trenkwalder, A and Hendl, G and Schreck, F and Rudolf Grimm and Tiecke, T. and Walraven, J. and Kokkelmans, S. and Eite Tiesinga and Paul S Julienne} } @article {Tang2008, title = {Green fluorescent protein in inertially injected aqueous nanodroplets}, journal = {Langmuir}, volume = {24}, number = {9}, year = {2008}, month = {may}, pages = {4975{\textendash}8}, publisher = {American Chemical Society}, abstract = {We inertially inject and study the contents of optically trappable aqueous nanodroplets (hydrosomes) emulsified in a perfluorinated matrix. A new piezoelectric actuated device for production of single hydrosomes on demand is introduced. Hydrosomes containing enhanced green fluorescent protein (EGFP) were injected, optically trapped, and held at the focus of an excitation laser in a confocal microscope, and single-molecule photobleaching events were observed. The rotational diffusion time of EGFP in trapped hydrosomes was measured using time-resolved fluorescence anisotropy. In free solution, the mean rotational diffusion time was determined to be 13.8 +/- 0.1 ns at 3 microM and 14.0 +/- 0.2 ns at 10 microM. In hydrosomes, the mean rotational diffusion time was similar and determined to be 12.6 +/- 1.0 ns at 3 microM and 15.5 +/- 1.6 ns at 10 microM. We conclude that the rotational motion inside the nanodroplets is consistent with rotation in free solution and that the protein therefore does not aggregate at the water-oil interface. Protein can be confined in hydrosomes with high efficiency using this technique, which provides an alternative to surface attachment or lipid encapsulation and opens up new avenues of research using single molecules contained in fluid nanovolumes.}, keywords = {2008, Green Fluorescent Proteins, Green Fluorescent Proteins: chemistry, Nanostructures, Nanostructures: chemistry, Single Fellow, Spectrophotometry, Thermodynamics}, issn = {0743-7463}, url = {http://dx.doi.org/10.1021/la800329k}, author = {Tang, Jianyong and Ana M Jofre and Lowman, Geoffrey M. and Rani B Kishore and Joseph E Reiner and Kristian Helmerson and Goldner, Lori S. and Greene, Mark E.} } @article { ISI:000254940900058, title = {Intrinsic gap of the nu=5/2 fractional quantum Hall state}, journal = {PHYSICAL REVIEW LETTERS}, volume = {100}, number = {14}, year = {2008}, month = {APR 11}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.100.146803}, author = {Dean, C. R. and Piot, B. A. and Hayden, P. and S. Das Sarma and Gervais, G. and Pfeiffer, L. N. and West, K. W.} } @article {Galitski2008a, title = {Mesoscopic gap fluctuations in an unconventional superconductor}, journal = {Phys. Rev. B}, volume = {77}, number = {10}, year = {2008}, month = {mar}, keywords = {2008, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v77/i10/e100502}, author = {Victor M Galitski} } @article {Civelli2008, title = {Nodal-Antinodal Dichotomy and the Two Gaps of a Superconducting Doped Mott Insulator}, journal = {Phys. Rev. Lett.}, volume = {100}, number = {4}, year = {2008}, month = {jan}, pages = {5}, abstract = {We study the superconducting state of the hole-doped two-dimensional Hubbard model using Cellular Dynamical Mean Field Theory, with the Lanczos method as impurity solver. In the under-doped regime, we find a natural decomposition of the one-particle (photoemission) energy-gap into two components. The gap in the nodal regions, stemming from the anomalous self-energy, decreases with decreasing doping. The antinodal gap has an additional contribution from the normal component of the self-energy, inherited from the normal-state pseudogap, and it increases as the Mott insulating phase is approached.}, keywords = {2008, No Fellows}, issn = {0031-9007}, url = {http://arxiv.org/abs/0704.1486}, author = {Civelli, M. and Capone, M. and Georges, A. and Haule, K. and Parcollet, O. and Tudor D Stanescu and Kotliar, G.} } @article {Galitski2008, title = {Nonperturbative Microscopic Theory of Superconducting Fluctuations near a Quantum Critical Point}, journal = {Phys. Rev. Lett.}, volume = {100}, number = {12}, year = {2008}, month = {mar}, keywords = {2008, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v100/i12/e127001}, author = {Victor M Galitski} } @article {Gomez2008, title = {Nuclear Magnetic Moment of Fr210: A Combined Theoretical and Experimental Approach}, journal = {Phys. Rev. Lett.}, volume = {100}, number = {17}, year = {2008}, month = {may}, keywords = {2008, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v100/i17/e172502}, author = {Gomez, E. and Aubin, S. and Luis A Orozco and G Sprouse and Iskrenova-Tchoukova, E. and Marianna S Safronova} } @article {Cole2008, title = {Spatial adiabatic passage in a realistic triple well structure}, journal = {Phys. Rev. B}, volume = {77}, number = {23}, year = {2008}, month = {jun}, keywords = {2008, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v77/i23/e235418}, author = {Cole, J. and Greentree, A. and Hollenberg, L. and S. Das Sarma} } @article {Goldschmidt2008, title = {Spectrally bright and broad fiber-based heralded single-photon source}, journal = {Phys. Rev. A}, volume = {78}, number = {1}, year = {2008}, month = {jul}, keywords = {2008, Single Fellow}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v78/i1/e013844}, author = {Elizabeth A Goldschmidt and Matthew Eisaman and Jingyun Fan and Sergey V Polyakov and Alan L Migdall} } @article {Galvan2008, title = {Two-color modulation transfer spectroscopy}, year = {2008}, month = {dec}, pages = {14}, abstract = {We present two-color modulation transfer spectroscopy as a tool for precision studies of atomic properties of excited states. The bi-colored technique addresses a narrow set of velocity groups of a thermal atomic vapour using a two-step transition to "burn a hole" in the velocity distribution. The resulting spectrum presents sub-Doppler linewidths, good signal to noise ratio and the trademark sidebands that work as an in situ ruler for the energy spacing between atomic resonances. The spectra obtained can be used for different applications such as measurements of energy splittings or stabilization of laser frequencies to excited atomic transitions.}, keywords = {2008}, url = {http://arxiv.org/abs/0812.1386}, author = {Galvan, A. Perez and Dong Sheng and Luis A Orozco and Zhao, Y} } @article {PEREZGALVAN2007, title = {Comparison of hyperfine anomalies in the 5S1/25S1/2 and 6S1/26S1/2 levels of 85Rb and 87Rb}, journal = {Phys. Lett. B}, volume = {655}, number = {3-4}, year = {2007}, month = {nov}, pages = {114{\textendash}118}, abstract = {We observe a hyperfine anomaly in the measurement of the hyperfine splitting of the 6S1/2 excited level in rubidium. We perform two step spectroscopy using the 5S1/2{\textrightarrow}5P1/2{\textrightarrow}6S1/2 excitation sequence. We measure the splitting of the 6S1/2 level and obtain for the magnetic dipole constants of 85Rb and 87Rb and , respectively. The hyperfine anomaly difference of comes from the Bohr Weisskopf effect: a correction to the point interaction between the finite nuclear magnetization and the electrons, and agrees with that obtained in the 5S1/2 ground state.}, keywords = {2007, 21.60.-n, 32.10.fn, 32.30.-r, Single Fellow}, issn = {03702693}, url = {http://dx.doi.org/10.1016/j.physletb.2007.09.042}, author = {A P{\'e}rez Galv{\'a}n and Zhao, Y and Luis A Orozco and Gomez, E. and A Lange and F Baumer and G Sprouse} } @article {Nagornykh2007, title = {Expansion of a mesoscopic Fermi system from a harmonic trap}, journal = {Phys. Rev. A}, volume = {75}, number = {6}, year = {2007}, month = {jun}, pages = {4}, abstract = {We study quantum dynamics of an atomic Fermi system with a finite number of particles, N, after it is released from a harmonic trapping potential. We consider two different initial states: The Fermi sea state and the paired state described by the projection of the grand-canonical BCS wave function to the subspace with a fixed number of particles. In the former case, we derive exact and simple analytic expressions for the dynamics of particle density and density-density correlation functions, taking into account the level quantization and possible anisotropy of the trap. In the latter case of a paired state, we obtain analytic expressions for the density and its correlators in the leading order with respect to the ratio of the trap frequency and the superconducting gap (the ratio assumed small). We discuss several dynamic features, such as time evolution of the peak due to pair correlations, which may be used to distinguish between the Fermi sea and the paired state.}, keywords = {2007, Single Fellow}, issn = {1050-2947}, url = {http://arxiv.org/abs/cond-mat/0612376}, author = {Nagornykh, Pavel and Victor M Galitski} } @article { ISI:000247947100001, title = {Exploring graphene - Recent research advances - Foreword}, journal = {SOLID STATE COMMUNICATIONS}, volume = {143}, number = {1-2}, year = {2007}, month = {JUL}, pages = {1-2}, issn = {0038-1098}, doi = {10.1016/j.ssc.2007.04.030}, author = {S. Das Sarma and Geim, Andre K. and Kim, Philip and MacDonald, Allan H.} } @article {Cheung2007, title = {High accuracy dual lens transmittance measurements}, journal = {Applied Optics}, volume = {46}, number = {22}, year = {2007}, month = {aug}, pages = {5396}, publisher = {OSA}, abstract = {We show how to determine the transmittance of short focal length lenses (f ≈ 19 mm and f ≈2 5 mm, in this case) with a combined uncertainty of 3 parts in 104 or better by measuring transmittances of lens pairs of a set of three or more lenses with the same nominal focal length. Uncertainties are minimized by optimizing the radiometric design of the setup and the measurement procedure. The technique is particularly useful in systems where the detector acceptance angle limits the beam geometry to relatively collimated beams.}, keywords = {2007, Lenses, Metrology, Single Fellow, Transmission}, issn = {0003-6935}, url = {http://ao.osa.org/abstract.cfm?URI=ao-46-22-5396}, author = {Jessica Y Cheung and Gardner, James L. and Alan L Migdall and Sergey V Polyakov and Ware, Michael} } @conference {Jofre2007a, title = {Hydrosomes: femtoliter containers for fluorescence spectroscopy studies}, booktitle = {Proceedings of the SPIE}, volume = {6644}, year = {2007}, month = {sep}, pages = {66440E{\textendash}66440E{\textendash}11}, publisher = {SPIE}, organization = {SPIE}, keywords = {2007, Single Fellow}, issn = {0277786X}, url = {http://adsabs.harvard.edu/abs/2007SPIE.6644E..10J}, author = {Ana M Jofre and Tang, Jianyong and Greene, Mark E. and Lowman, Geoffrey M. and Hodas, Nathan and Rani B Kishore and Kristian Helmerson and Goldner, Lori S.} } @conference {Helmerson2007, title = {Hydrosomes: optically trapped water droplets as nano-containers}, booktitle = {Proceedings of the SPIE}, volume = {6644}, number = {1}, year = {2007}, month = {sep}, pages = {66440D{\textendash}66440D{\textendash}10}, publisher = {SPIE}, organization = {SPIE}, keywords = {2007, Single Fellow}, issn = {0277786X}, url = {http://link.aip.org/link/?PSISDG/6644/66440D/1}, author = {Kristian Helmerson and Joseph E Reiner and Alice M Crawford and Ana M Jofre and Rani B Kishore and Goldner, Lori S. and Tang, Jianyong and Greene, Mark E. and Michael K Gilson} } @article {Xie2007, title = {Influence of a single quantum dot state on the characteristics of a microdisk laser}, journal = {Phys. Rev. Lett.}, volume = {98}, number = {11}, year = {2007}, month = {mar}, pages = {117401}, abstract = {We report a quantum dot microcavity laser with a cw sub-microW lasing threshold, where a significant reduction of the lasing threshold is observed when a single quantum dot (QD) state is aligned with a cavity mode. The quality factor exceeds 15,000 before the system lases. When no QD states are resonant, below threshold the cavity mode initially degrades with increasing pump power, after which saturation occurs and then the cavity mode recovers. We associate the initial cavity mode spoiling with QD state broadening that occurs with increasing pump power.}, keywords = {2007, Single Fellow}, issn = {0031-9007}, url = {http://www.ncbi.nlm.nih.gov/pubmed/17501091}, author = {Xie, Z G and Stephan G{\"o}tzinger and Wei Fang and Hui Cao and Glenn S Solomon} } @article {Gomez2007, title = {Light forces in ultracold photoassociation}, journal = {Phys. Rev. A}, volume = {75}, number = {1}, year = {2007}, month = {jan}, pages = {7}, abstract = {We study the time-resolved photoassociation of ultracold sodium in an optical dipole trap. The photoassociation laser excites pairs of atoms to molecular states of large total angular momentum at high intensities (above 20 kW/cm\$\^{}\{2\}\$). Such transitions are generally suppressed at ultracold temperatures by the centrifugal barriers for high partial waves. Time-resolved ionization measurements reveal that the atoms are accelerated by the dipole potential of the photoassociation beam. We change the collision energy by varying the potential depth, and observe a strong variation of the photoassociation rate. These results demonstrate the important role of light forces in cw photoassociation at high intensities.}, keywords = {2007, Multiple Fellows}, issn = {1050-2947}, url = {http://arxiv.org/abs/physics/0611175}, author = {Gomez, E. and Black, A. and L D Turner and Eite Tiesinga and Paul D Lett} } @article {Zhang2007c, title = {Magnetism and anomalous Hall effect in Co-(La,Sr)TiO3}, journal = {Phys. Rev. B}, volume = {76}, number = {8}, year = {2007}, month = {aug}, pages = {85323}, keywords = {2007, and superparamagnetism, Diamagnetism, Galvanomagnetic and other magnetotransport effects, Magnetic semiconductors, No Fellows, paramagnetism}, issn = {1098-0121}, url = {http://adsabs.harvard.edu/abs/2007PhRvB..76h5323Z}, author = {Zhang, S. and Yu, W. and Ogale, S. and Shinde, S. and Kundaliya, D. and Tse, Wang-Kong and Young, S. and Higgins, J. and Salamanca-Riba, L. and Herrera, M. and Fu, L. and Browning, N. and Greene, R. and Venkatesan, T.} } @article {Stanescu2007a, title = {Nonequilibrium Spin Dynamics in a Trapped Fermi Gas with Effective Spin-Orbit Interactions}, journal = {Phys. Rev. Lett.}, volume = {99}, number = {11}, year = {2007}, month = {sep}, keywords = {2007, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v99/i11/e110403}, author = {Tudor D Stanescu and Zhang, Chuanwei and Victor M Galitski} } @article {Adam2007, title = {A self-consistent theory for graphene transport}, journal = {PNAS}, volume = {104}, number = {47}, year = {2007}, month = {nov}, pages = {18392{\textendash}7}, abstract = {We demonstrate theoretically that most of the observed transport properties of graphene sheets at zero magnetic field can be explained by scattering from charged impurities. We find that, contrary to common perception, these properties are not universal but depend on the concentration of charged impurities n(imp). For dirty samples (250 x 10(10) cm(-2) < n(imp) < 400 x 10(10) cm(-2)), the value of the minimum conductivity at low carrier density is indeed 4e(2)/h in agreement with early experiments, with weak dependence on impurity concentration. For cleaner samples, we predict that the minimum conductivity depends strongly on n(imp), increasing to 8e(2)/h for n(imp) approximately 20 x 10(10) cm(-2). A clear strategy to improve graphene mobility is to eliminate charged impurities or use a substrate with a larger dielectric constant.}, keywords = {2007, Multiple Fellows}, issn = {1091-6490}, url = {http://www.pnas.org/cgi/content/abstract/104/47/18392}, author = {Shaffique Adam and E H Hwang and Victor M Galitski and S. Das Sarma} } @article {Stanescu2007, title = {Spin relaxation in a generic two-dimensional spin-orbit coupled system}, journal = {Phys. Rev. B}, volume = {75}, number = {12}, year = {2007}, month = {mar}, keywords = {2007, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v75/i12/e125307}, author = {Tudor D Stanescu and Victor M Galitski} } @article {Black2007, title = {Spinor Dynamics in an Antiferromagnetic Spin-1 Condensate}, journal = {Phys. Rev. Lett.}, volume = {99}, number = {7}, year = {2007}, month = {aug}, keywords = {2007, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v99/i7/e070403}, author = {Black, A. and Gomez, E. and L D Turner and Jung, S. and Paul D Lett} } @article {Galitski2007a, title = {Spin-triplet pairing instability of the spinon fermi surface in a U(1) spin liquid}, journal = {Phys. Rev. Lett.}, volume = {99}, number = {26}, year = {2007}, month = {dec}, pages = {266403}, abstract = {Recent experiments on the organic compound kappa-(ET)2Cu2(CN)3 have provided a promising example of a two-dimensional spin liquid state. This phase is described by a two-dimensional spinon Fermi sea coupled to a U(1) gauge field. We study Kohn-Luttinger-like pairing instabilities of the spinon Fermi surface due to singular interaction processes with twice-the-Fermi-momentum transfer. We find that under certain circumstances the pairing instability occurs in odd-orbital-angular momentum or spin-triplet channels. Implications to experiments are discussed.}, keywords = {2007, Single Fellow}, issn = {0031-9007}, url = {http://www.ncbi.nlm.nih.gov/pubmed/18233593}, author = {Victor M Galitski and Kim, Yong Baek} } @article {Galitski2007, title = {Statistics of random voltage fluctuations and the low-density residual conductivity of graphene}, journal = {Phys. Rev. B}, volume = {76}, number = {24}, year = {2007}, month = {dec}, keywords = {2007, Multiple Fellows}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v76/i24/e245405}, author = {Victor M Galitski and Shaffique Adam and S. Das Sarma} } @article {Galitski2006, title = {Boundary conditions for spin diffusion in disordered systems}, journal = {Phys. Rev. B}, volume = {74}, number = {11}, year = {2006}, pages = {6}, abstract = {We develop a general scheme of deriving boundary conditions for spin-charge coupled transport in disordered systems with spin-orbit interactions. To illustrate the application of the method, we explicitly derive boundary conditions for spin diffusion in the Rashba model. Due to the surface spin precession, the boundary conditions are non-trivial and contain terms, which couple different components of the spin density. We argue that boundary conditions and the corresponding electric-field-induced spin accumulation generally depend on the nature of the boundary and therefore the spin Hall effect in a spin-orbit coupled system can be viewed as a non-universal edge phenomenon.}, keywords = {2006, Multiple Fellows}, issn = {1098-0121}, url = {http://arxiv.org/abs/cond-mat/0601677}, author = {Victor M Galitski and Burkov, Anton and S. Das Sarma} } @article {Ryu2006, title = {High-order quantum resonances observed in a periodically kicked Bose-Einstein condensate}, journal = {Phys. Rev. Lett.}, volume = {96}, number = {16}, year = {2006}, month = {apr}, pages = {160403}, abstract = {We have observed high-order quantum resonances in a realization of the quantum delta-kicked rotor, using Bose-condensed Na atoms subjected to a pulsed standing wave of laser light. These resonances occur for pulse intervals that are rational fractions of the Talbot time, and are characterized by ballistic momentum transfer to the atoms. The condensate{\textquoteright}s narrow momentum distribution not only permits the observation of the quantum resonances at 3/4 and 1/3 of the Talbot time, but also allows us to study scaling laws for the resonance width in quasimomentum and pulse interval.}, keywords = {2006, Multiple Fellows}, issn = {0031-9007}, url = {http://www.ncbi.nlm.nih.gov/pubmed/16712208}, author = {Changhyun Ryu and Andersen, M.F. and Alipasha Vaziri and D{\textquoteright}Arcy, M B and Grossman, J M and Kristian Helmerson and William D Phillips} } @article {Brey2006, title = {Mean-field theory for double perovskites: Coupling between itinerant electron spins and localized spins}, journal = {Phys. Rev. B}, volume = {74}, number = {9}, year = {2006}, month = {sep}, pages = {94429}, keywords = {2006, Colossal magnetoresistance, General theory and models of magnetic ordering, Single Fellow}, issn = {1098-0121}, url = {http://adsabs.harvard.edu/abs/2006PhRvB..74i4429B}, author = {Brey, L. and Calder{\'o}n, M.J. and S. Das Sarma and Guinea, F.} } @article {Gea-Banacloche2006, title = {Mean-field treatment of the damping of the oscillations of a one-dimensional Bose gas in an optical lattice}, journal = {Phys. Rev. A}, volume = {73}, number = {1}, year = {2006}, month = {jan}, abstract = {We present a theoretical treatment of the surprisingly large damping observed recently in one-dimensional Bose-Einstein atomic condensates in optical lattices. We show that time-dependent Hartree-Fock-Bogoliubov (HFB) calculations can describe qualitatively the main features of the damping observed over a range of lattice depths. We also derive a formula of the fluctuation-dissipation type for the damping, based on a picture in which the coherent motion of the condensate atoms is disrupted as they try to flow through the random local potential created by the irregular motion of noncondensate atoms. We expect this irregular motion to result from the well-known dynamical instability exhibited by the mean-field theory for these systems. When parameters for the characteristic strength and correlation times of the fluctuations, obtained from the HFB calculations, are substituted in the damping formula, we find very good agreement with the experimentally-observed damping, as long as the lattice is shallow enough for the fraction of atoms in the Mott insulator phase to be negligible. We also include, for completeness, the results of other calculations based on the Gutzwiller ansatz, which appear to work better for the deeper lattices.}, keywords = {2006, Multiple Fellows}, issn = {1050-2947}, url = {http://arxiv.org/abs/cond-mat/0410677}, author = {Gea-Banacloche, Julio and A M Rey and Guido Pupillo and Carl J Williams and Charles W Clark} } @article {Reiner2006a, title = {Optically trapped aqueous droplets for single molecule studies}, journal = {Appl. Phys. Lett.}, volume = {89}, number = {1}, year = {2006}, pages = {013904}, publisher = {AIP}, keywords = {2006, Single Fellow}, issn = {00036951}, url = {http://www.mendeley.com/research/optically-trapped-aqueous-droplets-for-single-molecule-studies/}, author = {Joseph E Reiner and Alice M Crawford and Rani B Kishore and Goldner, Lori S. and Kristian Helmerson and Michael K Gilson} } @article {Romero2006, title = {Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers}, journal = {Optics Express}, volume = {14}, number = {21}, year = {2006}, month = {oct}, pages = {9988}, publisher = {OSA}, abstract = {The response of gold nanoparticle dimers is studied theoretically near and beyond the limit where the particles are touching. As the particles approach each other, a dominant dipole feature is observed that is pushed into the infrared due to interparticle coupling and that is associated with a large pileup of induced charge in the interparticle gap. The redshift becomes singular as the particle separation decreases. The response weakens for very small separation when the coupling across the interparticle gap becomes so strong that dipolar oscillations across the pair are inhibited. Lowerwavelength, higher-order modes show a similar separation dependence in nearly touching dimers. After touching, singular behavior is observed through the emergence of a new infrared absorption peak, also accompanied by huge charge pileup at the interparticle junction, if initial interparticle-contact is made at a single point. This new mode is distinctly different from the lowest mode of the separated dimer. When the junction is made by contact between flat surfaces, charge at the junction is neutralized and mode evolution is continuous through contact. The calculated singular response explains recent experiments on metallic nanoparticle dimers and is relevant in the design of nanoparticle-based sensors and plasmon circuits.}, keywords = {2006, Particles, Single Fellow, Surface plasmons}, issn = {1094-4087}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-14-21-9988}, author = {Romero, Isabel and Javier Aizpurua and Garnett W Bryant and Javier F Garc{\'\i}a De Abajo} } @article {Kohler2006, title = {Production of cold molecules via magnetically tunable Feshbach resonances}, journal = {Rev. Mod. Phys.}, volume = {78}, number = {4}, year = {2006}, month = {dec}, pages = {1311{\textendash}1361}, keywords = {2006, Single Fellow}, issn = {0034-6861}, url = {http://rmp.aps.org/abstract/RMP/v78/i4/p1311\_1}, author = {K{\"o}hler, Thorsten and G{\'o}ral, Krzysztof and Paul S Julienne} } @article {Deng2006, title = {Quantum Degenerate Exciton-Polaritons in Thermal Equilibrium}, journal = {Phys. Rev. Lett.}, volume = {97}, number = {14}, year = {2006}, month = {oct}, abstract = {We study the momentum distribution and relaxation dynamics of semiconductor microcavity polaritons by angle-resolved and time-resolved spectroscopy. Above a critical pump level, the thermalization time of polaritons at positive detunings becomes shorter than their lifetime, and the polaritons form a quantum degenerate Bose-Einstein distribution in thermal equilibrium with the lattice.}, keywords = {2006, Single Fellow}, issn = {0031-9007}, url = {http://arxiv.org/abs/cond-mat/0604394}, author = {Deng, Hui and Press, David and Stephan G{\"o}tzinger and Glenn S Solomon and Hey, Rudolf and Ploog, Klaus and Yoshihisa Yamamoto} } @article {Zhang2006a, title = {Semiconductor-Metal Nanoparticle Molecules: Hybrid Excitons and the Nonlinear Fano Effect}, journal = {Phys. Rev. Lett.}, volume = {97}, number = {14}, year = {2006}, month = {oct}, keywords = {2006, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v97/i14/e146804}, author = {Zhang, Wei and Govorov, Alexander and Garnett W Bryant} } @conference {Julienne2006, title = {Simple Theoretical Models for Resonant Cold Atom Interactions}, booktitle = {AIP Conference Proceedings}, volume = {869}, year = {2006}, month = {sep}, pages = {261{\textendash}268}, publisher = {AIP}, organization = {AIP}, abstract = {Magnetically tunable scattering resonances have been used with great success for precise control of s-wave scattering lengths in ultracold atomic collisions. We describe relatively simple yet quite powerful analytic treatments of such resonances based on the analytic properties of the van der Waals long range potential. This theory can be used to characterize a number of properties of specific resonances that have been used successfully in various experiments with \$\^{}\{87\}\$Rb, \$\^{}\{85\}\$Rb, \$\^{}\{40\}\$K, and \$\^{}\{6\}\$Li. Optical Feshbach resonances are also possible and may be practical with narrow intercombination line photoassociative transitions in species like Sr and Yb.}, keywords = {2006, Single Fellow}, issn = {0094243X}, url = {http://arxiv.org/abs/physics/0609013}, author = {Paul S Julienne and Gao, Bo} } @article {Stanescu2006, title = {Surface states, Friedel oscillations, and spin accumulation in p-doped semiconductors}, journal = {Phys. Rev. B}, volume = {74}, number = {20}, year = {2006}, month = {nov}, keywords = {2006, Single Fellow}, issn = {1098-0121}, url = {http://www.mendeley.com/research/surface-states-friedel-oscillations-spin-accumulation-pdoped-semiconductors/}, author = {Tudor D Stanescu and Victor M Galitski} }