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 { WOS:000727004500001, title = {Dynamical evolution and decay of multi-charged quantum vortex in a Bose-Einstein condensate}, journal = {Laser Phys. Lett.}, volume = {19}, number = {1}, year = {2022}, month = {JAN}, publisher = {IOP Publishing Ltd}, type = {Article}, abstract = {We report the observation of the twisted decay of quadruply charged vortices taking place in an atomic Bose-Einstein condensate. Supporting numerical simulations show that the singly-charged vortices, which result from the decay of a multi-charged vortex, twist around intertwined in the shape of helical Kelvin waves.}, keywords = {Bose-Einstein condensates, Kelvin waves, multiply charged vortices}, issn = {1612-2011}, doi = {10.1088/1612-202X/ac3d24}, author = {Telles, G. D. and Tavares, P. E. S. and Fritsch, A. R. and Cidrim, A. and Bagnato, V. S.} } @article { WOS:000674773400001, title = {Circulation by Microwave-Induced Vortex Transport for Signal Isolation}, journal = {PRX Quantum}, volume = {2}, number = {3}, year = {2021}, month = {JUL 15}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Magnetic fields break time-reversal symmetry, which is leveraged in many settings to enable the nonreciprocal behavior of light. This is the core physics of circulators and other elements used in a variety of microwave and optical settings. Commercial circulators in the microwave domain typically use ferromagnetic materials and wave interference, requiring large devices and large fields. However, quantum information devices for sensing and computation require small sizes, lower fields, and better on-chip integration. Equivalences to ferromagnetic order-such as the XY model-can be realized at much lower magnetic fields by use of arrays of superconducting islands connected by Josephson junctions. Here we show that the quantum-coherent motion of a single vortex in such an array suffices to induce nonreciprocal behavior, enabling a small-scale, moderate-bandwidth, and low insertion loss circulator at very low magnetic fields and at microwave frequencies relevant for experiments with qubits.}, doi = {10.1103/PRXQuanttun.2.030309}, author = {Richman, Brittany and Taylor, Jacob M.} } @article { WOS:000698806700001, title = {CODATA Recommended Values of the Fundamental Physical Constants: 2018}, journal = {J. Phys. Chem. Ref. Data}, volume = {50}, number = {3}, year = {2021}, month = {SEP 1}, publisher = {AIP Publishing}, type = {Article}, abstract = {We report the 2018 self-consistent values of constants and conversion factors of physics and chemistry recommended by the Committee on Data of the International Science Council. The recommended values can also be found at physics.nist.gov/constants. The values are based on a least-squares adjustment that takes into account all theoretical and experimental data available through 31 December 2018. A discussion of the major improvements as well as inconsistencies within the data is given. The former include a decrease in the uncertainty of the dimensionless fine-structure constant and a nearly two orders of magnitude improvement of particle masses expressed in units of kg due to the transition to the revised International System of Units (SI) with an exact value for the Planck constant. Further, because the elementary charge, Boltzmann constant, and Avogadro constant also have exact values in the revised SI, many other constants are either exact or have significantly reduced uncertainties. Inconsistencies remain for the gravitational constant and the muon magnetic-moment anomaly. The proton charge radius puzzle has been partially resolved by improved measurements of hydrogen energy levels. (c) 2021 by the U.S. Secretary of Commerce on behalf of the United States. All rights reserved.}, keywords = {conventional and SI electrical units, electron and muon g-factors, fine-structure constant, fundamental constants, precision measurements, proton radius, QED, revised SI, Rydberg constant}, issn = {0047-2689}, doi = {10.1063/5.0064853}, author = {Tiesinga, Eite and Mohr, Peter J. and Newell, David B. and Taylor, Barry N.} } @article { WOS:000669060200001, title = {CODATA recommended values of the fundamental physical constants: 2018}, journal = {Rev. Mod. Phys.}, volume = {93}, number = {2}, year = {2021}, month = {JUN 30}, publisher = {AMER PHYSICAL SOC}, type = {Review}, abstract = {We report the 2018 self-consistent values of constants and conversion factors of physics and chemistry recommended by the Committee on Data of the International Science Council (CODATA). The recommended values can also be found at physics.nist.gov/constants. The values are based on a least-squares adjustment that takes into account all theoretical and experimental data available through 31 December 2018. A discussion of the major improvements as well as inconsistencies within the data is given. The former include a decrease in the uncertainty of the dimensionless fine-structure constant and a nearly two orders of magnitude improvement of particle masses expressed in units of kg due to the transition to the revised International System of Units (SI) with an exact value for the Planck constant. Further, because the elementary charge, Boltzmann constant, and Avogadro constant also have exact values in the revised SI, many other constants are either exact or have significantly reduced uncertainties. Inconsistencies remain for the gravitational constant and the muon magnetic-moment anomaly. The proton charge radius puzzle has been partially resolved by improved measurements of hydrogen energy levels.}, issn = {0034-6861}, doi = {10.1103/RevModPhys.93.025010}, author = {Tiesinga, Eite and Mohr, Peter J. and Newell, David B. and Taylor, Barry N.} } @article {liang_coherence_2021, title = {Coherence and decoherence in the {Harper}-{Hofstadter} model}, 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 quantum simulated the 2D Harper-Hofstadter (HH) lattice model in a highly elongated tube geometry-three sites in circumference-using an atomic Bose-Einstein condensate. In addition to the usual transverse (out-of-plane) magnetic flux, piercing the surface of the tube, we threaded a longitudinal flux Phi(L) down the axis of the tube. This geometry evokes an Aharonov-Bohm interferometer, where noise in Phi(L) would readily decohere the interference present in trajectories encircling the tube. We observe this behavior only when transverse flux is a rational fraction of the flux quantum and remarkably find that for irrational fractions the decoherence is absent. Furthermore, at rational values of transverse flux, we show that the time evolution averaged over the noisy longitudinal flux matches the time evolution at nearby irrational fluxes. Thus, the appealing intuitive picture of an Aharonov-Bohm interferometer is insufficient. Instead, we quantitatively explain our observations by transforming the HH model into a collection of momentum-space Aubry-Andre models.}, doi = {10.1103/PhysRevResearch.3.023058}, author = {Liang, Q-Y and Trypogeorgos, D. and Valdes-Curiel, A. and Tao, J. and Zhao, M. and Spielman, I. B.} } @article {burenkov_coherent_2021, title = {Coherent optical processes with an all-optical atomic simulator}, journal = {Opt. Express}, volume = {29}, number = {1}, year = {2021}, note = {Place: 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA Publisher: OPTICAL SOC AMER Type: Article}, month = {jan}, pages = {330{\textendash}341}, abstract = {We show how novel photonic devices such as broadband quantum memory and efficient quantum frequency transduction can be implemented using three-wave mixing processes in a 1D array of nonlinear waveguides evanescently coupled to nearest neighbors. We do this using an analogy of an atom interacting with an external optical field using both classical and quantum models of the optical fields and adapting well-known coherent processes from atomic optics, such as electromagnetically induced transparency and stimulated Raman adiabatic passage to design. This approach allows the implementation of devices that are very difficult or impossible to implement by conventional techniques.

}, issn = {1094-4087}, doi = {10.1364/OE.415480}, author = {Burenkov, Ivan A. and Novikova, Irina and Tikhonova, Olga V and Polyakov, Sergey V} } @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 {zeuner_experimental_2021, title = {Experimental quantum homomorphic encryption}, journal = {npj Quantum Inform.}, volume = {7}, number = {1}, year = {2021}, note = {Place: HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY Publisher: NATURE RESEARCH Type: Article}, month = {feb}, abstract = {Quantum computers promise not only to outperform classical machines for certain important tasks, but also to preserve privacy of computation. For example, the blind quantum computing protocol enables secure delegated quantum computation, where a client can protect the privacy of their data and algorithms from a quantum server assigned to run the computation. However, this security comes with the practical limitation that the client and server must communicate after each step of computation. A practical alternative is homomorphic encryption, which does not require any interactions, while providing quantum-enhanced data security for a variety of computations. In this scenario, the server specifies the computation to be performed, and the client provides only the input data, thus enabling secure noninteractive computation. Here, we demonstrate homomorphic-encrypted quantum computing with unitary transformations of individual qubits, as well as multi-qubit quantum walk computations using single-photon states and non-birefringent integrated optics. The client encrypts their input in the photons{\textquoteright} polarization state, while the server performs the computation using the path degree of freedom. Our demonstration using integrated quantum photonics underlines the applicability of homomorphic-encrypted quantum computations, and shows the potential for delegated quantum computing using photons.}, doi = {10.1038/s41534-020-00340-8}, author = {Zeuner, Jonas and Pitsios, Ioannis and Tan, Si-Hui and Sharma, Aditya N. and Fitzsimons, Joseph F. and Osellame, Roberto and Walther, Philip} } @article { WOS:000674692700001, title = {Faster Digital Quantum Simulation by Symmetry Protection}, journal = {PRX Quantum}, volume = {2}, number = {1}, year = {2021}, month = {FEB 12}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Simulating the dynamics of quantum systems is an important application of quantum computers and has seen a variety of implementations on current hardware. We show that by introducing quantum gates implementing unitary transformations generated by the symmetries of the system, one can induce destructive interference between the errors from different steps of the simulation, effectively giving faster quantum simulation by symmetry protection. We derive rigorous bounds on the error of a symmetry-protected simulation algorithm and identify conditions for optimal symmetry protection. In particular, when the symmetry transformations are chosen as powers of a unitary, the error of the algorithm is approximately projected to the so-called quantum Zeno subspaces. We prove a bound on this approximation error, exponentially improving a recent result of Burgarth, Facchi, Gramegna, and Pascazio. We apply the symmetry-protection technique to the simulations of the XXZ Heisenberg interactions with local disorder and the Schwinger model in quantum field theory. For both systems, the technique can reduce the simulation error by several orders of magnitude over the unprotected simulation. Finally, we provide numerical evidence suggesting that the technique can also protect simulation against other types of coherent, temporally correlated errors, such as the 1/f noise commonly found in solid-state experiments.}, doi = {10.1103/PRXQuantum.2.010323}, author = {Tran, Minh C. and Su, Yuan and Carney, Daniel and Taylor, Jacob M.} } @article { WOS:000655905200002, title = {Generating function for tensor network diagrammatic summation}, journal = {Phys. Rev. B}, volume = {103}, number = {20}, year = {2021}, month = {MAY 28}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The understanding of complex quantum many-body systems has been vastly boosted by tensor network (TN) methods. Among others, excitation spectrum and long-range interacting systems can be studied using TNs, where one however confronts the intricate summation over an extensive number of tensor diagrams. Here, we introduce a set of generating functions, which encode the diagrammatic summations as leading-order series expansion coefficients. Combined with automatic differentiation, the generating function allows us to solve the problem of TN diagrammatic summation. We illustrate this scheme by computing variational excited states and the dynamical structure factor of a quantum spin chain, and further investigating entanglement properties of excited states. Extensions to infinite-size systems and higher dimension are outlined.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.103.205155}, author = {Tu, Wei-Lin and Wu, Huan-Kuang and Schuch, Norbert and Kawashima, Naoki and Chen, Ji-Yao} } @article { WOS:000664665500002, title = {Josephson detection of time-reversal symmetry broken superconductivity in SnTe nanowires}, journal = {npj Quantum Mater.}, volume = {6}, number = {1}, year = {2021}, month = {JUN 18}, publisher = {NATURE RESEARCH}, type = {Article}, abstract = {A Josephson junction (JJ) couples the supercurrent flowing between two weakly linked superconductors to the phase difference between them via a current-phase relation (CPR). While a sinusoidal CPR is expected for conventional junctions with insulating weak links, devices made from some exotic materials may give rise to unconventional CPRs and unusual Josephson effects. In this work, we present such a case: we investigate the proximity-induced superconductivity in SnTe nanowires by incorporating them as weak links in JJs and observe a deviation from the standard CPR. We report on indications of an unexpected breaking of time-reversal symmetry in these devices, detailing the unconventional characteristics that reveal this behavior. These include an asymmetric critical current in the DC Josephson effect, a prominent second harmonic in the AC Josephson effect, and a magnetic diffraction pattern with a minimum in critical current at zero magnetic field. The analysis examines how multiband effects and the experimentally visualized ferroelectric domain walls give rise to this behavior, giving insight into the Josephson effect in materials that possess ferroelectricity and/or multiband superconductivity.}, doi = {10.1038/s41535-021-00359-w}, author = {Trimble, C. J. and Wei, M. T. and Yuan, N. F. Q. and Kalantre, S. S. and Liu, P. and Han, H. -J. and Han, M. -G. and Zhu, Y. and Cha, J. J. and Fu, L. and Williams, J. R.} } @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 { WOS:000655878500007, title = {Many-body physics in small systems: Observing the onset and saturation of correlation in linear atomic chains}, journal = {Phys. Rev. B}, volume = {103}, number = {19}, year = {2021}, month = {MAY 20}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The exact study of small systems can guide us toward relevant measures for extracting information about many-body physics as we move to larger and more complex systems capable of quantum information processing or quantum analog simulation. We use exact diagonalization to study many electrons in short one-dimensional atom chains represented by long-range extended Hubbard-like models. We introduce a measure, the single-particle excitation content (SPEC) of an eigenstate and show that the functional dependence of the SPEC on the eigenstate number reveals the nature of the ground state (ordered phases), and the onset and saturation of correlation between the electrons as Coulomb interaction strength increases. We use this SPEC behavior to identify five regimes as interaction is increased: A noninteracting single-particle regime, a regime of perturbative Coulomb interaction in which the SPEC is a nearly universal function of eigenstate number, the onset and saturation of correlation, a regime of fully correlated states in which hopping is a perturbation, and the SPEC is a different universal function of state number and the regime of no hopping. In particular, the behavior of the SPEC shows that when electron-electron correlation plays a minor role, all of the lowest-energy eigenstates are made up primarily of single-particle excitations of the ground state, and as the Coulomb interaction increases, the lowest-energy eigenstates increasingly contain many-particle excitations. In addition, the SPEC highlights a fundamental distinct difference between a noninteracting system and one with minute very weak interactions. Although the SPEC is a quantity that can be calculated for small exactly diagonalizable systems, it guides our intuition for larger systems, suggesting the nature of excitations and their distribution in the spectrum. Thus, this function, such as correlation functions or order parameters, provides us with a window of intuition about the behavior of a physical system.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.103.195429}, author = {Townsend, Emily and Neuman, Tomas and Debrecht, Alex and Aizpurua, Javier and Bryant, Garnett W.} } @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 {19231, title = {Optimal control for quantum detectors}, journal = {npj Quantum Information}, volume = {7}, year = {2021}, month = {03/2021}, abstract = {Quantum systems are promising candidates for sensing of weak signals as they can be highly sensitive to external perturbations, thus providing excellent performance when estimating parameters of external fields. However, when trying to detect weak signals that are hidden by background noise, the signal-to-noise ratio is a more relevant metric than raw sensitivity. We identify, under modest assumptions about the statistical properties of the signal and noise, the optimal quantum control to detect an external signal in the presence of background noise using a quantum sensor. Interestingly, for white background noise, the optimal solution is the simple and well-known spin-locking control scheme. Using numerical techniques, we further generalize these results to the case of background noise with a Lorentzian spectrum. We show that for increasing correlation time, pulse based sequences, such as CPMG, are also close to the optimal control for detecting the signal, with the crossover dependent on the signal frequency. These results show that an optimal detection scheme can be easily implemented in near-term quantum sensors without the need for complicated pulse shaping.

}, doi = {10.1038/s41534-021-00383-5}, url = {https://doi.org/10.1038/s41534-021-00383-5}, author = {Paraj Titum and Kevin Schultz and Alireza Seif and Gregory Quiroz and B. D. Clader} } @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 { WOS:000705661700006, title = {Probing open- and closed-channel p-wave resonances}, journal = {Phys. Rev. Res.}, volume = {3}, number = {3}, year = {2021}, month = {SEP 20}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We study the near-threshold molecular and collisional physics of a strong K-40 p-wave Feshbach resonance through a combination of measurements, numerical calculations, and modeling. Dimer spectroscopy employs both radio-frequency spin-flip association in the MHz band and resonant association in the kHz band. Systematic uncertainty in the measured binding energy is reduced by a model that includes both the Franck-Condon overlap amplitude and inhomogeneous broadening. Coupled-channels calculations based on mass-scaled K-39 potentials compare well to the observed binding energies and also reveal a low-energy p-wave shape resonance in the open channel. Contrary to conventional expectation, we observe a nonlinear variation of the binding energy with magnetic field, and explain how this arises from the interplay of the closed-channel ramping state with the near-threshold shape resonance in the open channel. We develop an analytic two-channel model that includes both resonances as well as the dipole-dipole interactions which, we show, become important at low energy. Using this parametrization of the energy dependence of the scattering phase, we can classify the studied K-40 resonance as broad. Throughout the paper, we compare to the well-understood s-wave case and discuss the significant role played by van der Waals physics. The resulting understanding of the dimer physics of p-wave resonances provides a solid foundation for future exploration of few- and many-body orbital physics.}, doi = {10.1103/PhysRevResearch.3.033269}, author = {Ahmed-Braun, Denise J. M. and Jackson, Kenneth G. and Smale, Scott and Dale, Colin J. and Olsen, Ben A. and Kokkelmans, Servaas J. J. M. F. and Julienne, Paul S. and Thywissen, Joseph H.} } @article { WOS:000662078500026, title = {Purcell-Enhanced Single Photon Source Based on a Deterministically Placed WSe2 Monolayer Quantum Dot in a Circular Bragg Grating Cavity}, journal = {Nano Lett.}, volume = {21}, number = {11}, year = {2021}, month = {JUN 9}, pages = {4715-4720}, publisher = {AMER CHEMICAL SOC}, type = {Article}, abstract = {We demonstrate a deterministic Purcell-enhanced single photon source realized by integrating an atomically thin WSe2 layer with a circular Bragg grating cavity. The cavity significantly enhances the photoluminescence from the atomically thin layer and supports single photon generation with g((2)) (0) < 0.25. We observe a consistent increase of the spontaneous emission rate for WSe2 emitters located in the center of the Bragg grating cavity. These WSe2 emitters are self-aligned and deterministically coupled to such a broadband cavity, configuring a new generation of deterministic single photon sources, characterized by their simple and low-cost production and intrinsic scalability.}, keywords = {bullseyes cavities, Purcell effect, Quantum Dots, single photons, two-dimensional materials}, issn = {1530-6984}, doi = {10.1021/acs.nanolett.1c00978}, author = {Iff, Oliver and Buchinger, Quirin and Moczala-Dusanowska, Magdalena and Kamp, Martin and Betzold, Simon and Davanco, Marcelo and Srinivasan, Kartik and Tongay, Sefaattin and Anton-Solanas, Carlos and Hoefling, Sven and Schneider, Christian} } @article { WOS:000674685900001, title = {Quantum Computer Systems for Scientific Discovery}, journal = {PRX Quantum}, volume = {2}, number = {1}, year = {2021}, month = {FEB 24}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The great promise of quantum computers comes with the dual challenges of building them and finding their useful applications. We argue that these two challenges should be considered together, by codesigning full-stack quantum computer systems along with their applications in order to hasten their development and potential for scientific discovery. In this context, we identify scientific and community needs, opportunities, a sampling of a few use case studies, and significant challenges for the development of quantum computers for science over the next 2-10 years. This document is written by a community of university, national laboratory, and industrial researchers in the field of Quantum Information Science and Technology, and is based on a summary from a U.S. National Science Foundation workshop on Quantum Computing held on October 21-22, 2019 in Alexandria, VA.}, doi = {10.1103/PRXQuantum.2.017001}, author = {Alexeev, Yuri and Bacon, Dave and Brown, Kenneth R. and Calderbank, Robert and Carr, Lincoln D. and Chong, Frederic T. and DeMarco, Brian and Englund, Dirk and Farhi, Edward and Fefferman, Bill and Gorshkov, V, Alexey and Houck, Andrew and Kim, Jungsang and Kimmel, Shelby and Lange, Michael and Lloyd, Seth and Lukin, Mikhail D. and Maslov, Dmitri and Maunz, Peter and Monroe, Christopher and Preskill, John and Roetteler, Martin and Savage, Martin J. and Thompson, Jeff} } @article { WOS:000643598200024, title = {Quantum Matched Filtering-Signal Processing in the Quantum Age}, journal = {Johns Hopkins APL Tech. Dig.}, volume = {35}, number = {4}, year = {2021}, pages = {422-425}, publisher = {JOHNS HOPKINS UNIV APPLIED PHYSICS LABORATORY LLC}, type = {Article}, abstract = {Optimal quantum control theory identifies the quantum equivalent of a matched filter, which maximizes the signal-to-noise ratio, enabling exploitation of extremely high sensitivity of quantum sensors to detect known signals of interest. This article describes a Johns Hopkins University Applied Physics Laboratory (APL) team{\textquoteright}s work in this field.}, issn = {0270-5214}, author = {Titum, Paraj and Schultz, Kevin M. and Seif, Alireza and Quiroz, Gregory D. and Clader, B. David} } @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:000692200800013, title = {Quantum Spin State Selectivity and Magnetic Tuning of Ultracold Chemical Reactions of Triplet Alkali-Metal Dimers with Alkali-Metal Atoms}, journal = {Phys. Rev. Lett.}, volume = {127}, number = {10}, year = {2021}, month = {AUG 31}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {{We demonstrate that it is possible to efficiently control ultracold chemical reactions of alkali-metal atoms colliding with open-shell alkali-metal dimers in their metastable triplet states by choosing the internal hyperfine and rovibrational states of the reactants as well as by inducing magnetic Feshbach resonances with an external magnetic field. We base these conclusions on coupled-channel statistical calculations that include the effects of hyperfine contact and magnetic-field-induced Zeeman interactions on ultracold chemical reactions of hyperfine-resolved ground-state Na and the triplet NaLi(a(3)Sigma(+)) producing singlet Na-2((1)Sigma(+)(g)) and a Li atom. We find that the reaction rates are sensitive to the initial hyperfine states of the reactants. The chemical reaction of fully spin-polarized, high-spin states of rotationless NaLi(a(3)Sigma(+)}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.127.103402}, author = {Hermsmeier, Rebekah and Klos, Jacek and Kotochigova, Svetlana and Tscherbul, Timur V.} } @article { WOS:000674748200001, title = {Ray-Based Framework for State Identification in Quantum Dot Devices}, journal = {PRX Quantum}, volume = {2}, number = {2}, year = {2021}, month = {JUN 7}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Quantum dots (QDs) defined with electrostatic gates are a leading platform for a scalable quantum computing implementation. However, with increasing numbers of qubits, the complexity of the control parameter space also grows. Traditional measurement techniques, relying on complete or near-complete exploration via two-parameter scans (images) of the device response, quickly become impractical with increasing numbers of gates. Here we propose to circumvent this challenge by introducing a measurement technique relying on one-dimensional projections of the device response in the multidimensional parameter space. Dubbed the {\textquoteleft}{\textquoteleft}ray-based classification (RBC) framework,{{\textquoteright}{\textquoteright}} we use this machine learning approach to implement a classifier for QD states, enabling automated recognition of qubit-relevant parameter regimes. We show that RBC surpasses the 82\% accuracy benchmark from the experimental implementation of image-based classification techniques from prior work, while reducing the number of measurement points needed by up to 70\%. The reduction in measurement cost is a significant gain for time-intensive QD measurements and is a step forward toward the scalability of these devices. We also discuss how the RBC-based optimizer, which tunes the device to a multiqubit regime, performs when tuning in the two-dimensional and three-dimensional parameter spaces defined by plunger and barrier gates that control the QDs. This work provides experimental validation of both efficient state identification and optimization with machine learning techniques for nontraditional measurements in quantum systems with high-dimensional parameter spaces and time-intensive measurements.}, doi = {10.1103/PRXQuantum.2.020335}, author = {Zwolak, Justyna P. and McJunkin, Thomas and Kalantre, Sandesh S. and Neyens, Samuel F. and MacQuarrie, E. R. and Eriksson, Mark A. and Taylor, Jacob M.} } @article { WOS:000687394800001, title = {Relativistic aspects of orbital and magnetic anisotropies in the chemical bonding and structure of lanthanide molecules}, journal = {New J. Phys.}, volume = {23}, number = {8}, year = {2021}, month = {AUG}, publisher = {IOP PUBLISHING LTD}, type = {Article}, abstract = {The electronic structure of magnetic lanthanide atoms is fascinating from a fundamental perspective. They have electrons in a submerged open 4f shell lying beneath a filled 6s shell with strong relativistic correlations leading to a large magnetic moment and large electronic orbital angular momentum. This large angular momentum leads to strong anisotropies, i. e. orientation dependencies, in their mutual interactions. The long-ranged molecular anisotropies are crucial for proposals to use ultracold lanthanide atoms in spin-based quantum computers, the realization of exotic states in correlated matter, and the simulation of orbitronics found in magnetic technologies. Short-ranged interactions and bond formation among these atomic species have thus far not been well characterized. Efficient relativistic computations are required. Here, for the first time we theoretically determine the electronic and ro-vibrational states of heavy homonuclear lanthanide Er-2 and Tm-2 molecules by applying state-of-the-art relativistic methods. In spite of the complexity of their internal structure, we were able to obtain reliable spin-orbit and correlation-induced splittings between the 91 Er-2 and 36 Tm-2 electronic potentials dissociating to two ground-state atoms. A tensor analysis allows us to expand the potentials between the atoms in terms of a sum of seven spin-spin tensor operators simplifying future research. The strengths of the tensor operators as functions of atom separation are presented and relationships among the strengths, derived from the dispersive long-range interactions, are explained. Finally, low-lying spectroscopically relevant ro-vibrational energy levels are computed with coupled-channels calculations and analyzed.}, keywords = {lanthanide molecules, relativistic electronic structure, spin tensor decomposition, ultracold lanthanide atoms}, issn = {1367-2630}, doi = {10.1088/1367-2630/ac1a9a}, author = {Tiesinga, Eite and Klos, Jacek and Li, Ming and Petrov, Alexander and Kotochigova, Svetlana} } @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:000647175700003, title = {Studying many-body localization in exchange-coupled electron spin qubits using spin-spin correlations}, journal = {Phys. Rev. B}, volume = {103}, number = {16}, year = {2021}, month = {APR 29}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We show that many-body localization (MBL) effects can be observed in a finite chain of exchange-coupled spin qubits in the presence of both exchange and magnetic noise, a system that has been experimentally realized in semiconductors and is a potential solid-state quantum computing platform. In addition to established measures of MBL, the level spacing ratio and the entanglement entropy, we propose another quantity, the spin-spin correlation function, that can be measured experimentally and is particularly well-suited to experiments in semiconductor-based electron spin qubit systems. We show that, in cases that the established measures detect as delocalized {\textquoteleft}{\textquoteleft}phases,{{\textquoteright}{\textquoteright}} the spin-spin correlation functions retain no memory of the system{\textquoteright}s initial state (i.e., the long-time value deviates significantly from the initial value), but that they do retain memory in cases that the established measures detect as localized {\textquoteleft}{\textquoteleft}phases.{{\textquoteright}{\textquoteright}} We also discover an interesting counterintuitive result that there is no clear tendency towards localization with increasing charge noise in small systems (3-10 spins). The proposed experiments should be feasible in the existing semiconductor spin qubit systems.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.103.165431}, author = {Throckmorton, Robert E. and Das Sarma, S.} } @article {liu_synthesis_2021, title = {Synthesis of {Narrow} {SnTe} {Nanowires} {Using} {Alloy} {Nanoparticles}}, journal = {ACS Appl. Electron. Mater.}, volume = {3}, number = {1}, year = {2021}, note = {Place: 1155 16TH ST, NW, WASHINGTON, DC 20036 USA Publisher: AMER CHEMICAL SOC Type: Article}, month = {jan}, pages = {184{\textendash}191}, abstract = {Topological crystalline insulator tin telluride (SnTe) provides a rich playground to examine interactions of correlated electronic states, such as ferroelectricity, topological surface states, and superconductivity. The study of SnTe nanowires may lead to even richer physics owing to the one-dimensional (1D) confinement effect and an increased contribution from the topological surface states. Thus, for transport measurements, SnTe nanowires must be synthesized with reduced diameters and high crystalline quality to ensure 1D confinement and phase coherence of the topological surface electrons. This study reports a facile growth method to produce narrow SnTe nanowires with a high yield using alloy nanoparticles as growth catalysts. The average diameter of the SnTe nanowires grown using alloy nanoparticles is 85 nm, nearly a factor of three reduction compared to the average diameter of 240 nm when using gold nanoparticles as growth catalysts. Transport measurements reveal the effect of the nanowire diameter on the residual resistance ratio and magnetoresistance. Particularly, the ferroelectric transition temperature for SnTe evolves systematically with the nanowire diameter. In situ cryogenic cooling of narrow SnTe nanowires in a transmission electron microscope directly reveals the cubic to rhombohedral structural transition, which is associated with the ferroelectric transition. Thus, these narrow SnTe nanowires represent a model system to study electronic states arising from 1D confinement, such as 1D topological superconductivity and potential multiband superconductivity.

}, keywords = {ferroelectric transition, Nanowires, tin telluride, topological crystalline insulators, vapor-liquid-solid growth}, doi = {10.1021/acsaelm.0c00740}, author = {Liu, Pengzi and Han, Hyeuk Jin and Wei, Julia and Hynek, David and Hart, James L. and Han, Myung Geun and Trimble, Christie Jordan and Williams, James and Zhu, Yimei and Cha, Judy J.} } @article {childs_theory_2021, title = {Theory of {Trotter} {Error} with {Commutator} {Scaling}}, journal = {Phys. Rev. X}, volume = {11}, number = {1}, year = {2021}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {feb}, abstract = {The Lie-Trotter formula, together with its higher-order generalizations, provides a direct approach to decomposing the exponential of a sum of operators. Despite significant effort, the error scaling of such product formulas remains poorly understood. We develop a theory of Trotter error that overcomes the limitations of prior approaches based on truncating the Baker-Campbell-Hausdorff expansion. Our analysis directly exploits the commutativity of operator summands, producing tighter error bounds for both real- and imaginary-time evolutions. Whereas previous work achieves similar goals for systems with geometric locality or Lie-algebraic structure, our approach holds, in general. We give a host of improved algorithms for digital quantum simulation and quantum Monte Carlo methods, including simulations of second-quantized plane-wave electronic structure, k-local Hamiltonians, rapidly decaying power-law interactions, clustered Hamiltonians, the transverse field Ising model, and quantum ferromagnets, nearly matching or even outperforming the best previous results. We obtain further speedups using the fact that product formulas can preserve the locality of the simulated system. Specifically, we show that local observables can be simulated with complexity independent of the system size for power-law interacting systems, which implies a Lieb-Robinson bound as a by-product. Our analysis reproduces known tight bounds for first- and second-order formulas. Our higher-order bound overestimates the complexity of simulating a one-dimensional Heisenberg model with an even-odd ordering of terms by only a factor of 5, and it is close to tight for power-law interactions and other orderings of terms. This result suggests that our theory can accurately characterize Trotter error in terms of both asymptotic scaling and constant prefactor.

}, issn = {2160-3308}, doi = {10.1103/PhysRevX.11.011020}, author = {Childs, Andrew M. and Su, Yuan and Tran, Minh C. and Wiebe, Nathan and Zhu, Shuchen} } @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 {19181, title = {Topological features without a lattice in Rashba spin-orbit coupled atoms}, journal = {Nature Communications}, volume = {12}, year = {2021}, month = {01/2021}, abstract = {Topological order can be found in a wide range of physical systems, from crystalline solids, photonic meta-materials and even atmospheric waves to optomechanic, acoustic and atomic systems. Topological systems are a robust foundation for creating quantized channels for transporting electrical current, light, and atmospheric disturbances. These topological effects are quantified in terms of integer-valued {\textquoteleft}invariants{\textquoteright}, such as the Chern number, applicable to the quantum Hall effect, or the\ Z2Z2\ invariant suitable for topological insulators. Here, we report the engineering of Rashba spin-orbit coupling for a cold atomic gas giving non-trivial topology, without the underlying crystalline structure that conventionally yields integer Chern numbers. We validated our procedure by spectroscopically measuring both branches of the Rashba dispersion relation which touch at a single Dirac point. We then measured the quantum geometry underlying the dispersion relation using matter-wave interferometry to implement a form of quantum state tomography, giving a Berry{\textquoteright}s phase with magnitude\ *π*. This implies that opening a gap at the Dirac point would give two dispersions (bands) each with half-integer Chern number, potentially implying new forms of topological transport.

We develop a broadly applicable approach that drastically increases the ability to predict the properties of complex atoms accurately. We apply it to the case of Ir-17(+), which is of particular interest for the development of novel atomic clocks with a high sensitivity to the variation of the fine-structure constant and to dark matter searches. In general, clock transitions are weak and very difficult to identify without accurate theoretical predictions. In the case of Ir-17(+), even stronger electric-dipole (El) transitions have eluded observation despite years of effort, raising the possibility that the theoretical predictions are grossly wrong. In this work, we provide accurate predictions of the transition wavelengths and E1 transition rates for Ir-17(+). Our results explain the lack of observations of the E1 transitions and provide a pathway toward the detection of clock transitions. The computational advances we demonstrate in this work are widely applicable to most elements in the periodic table and will allow us to solve numerous problems in atomic physics, astrophysics, and plasma physics.

}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.124.163001}, author = {Cheung, C. and Safronova, M. S. and Porsev, S. G. and Kozlov, M. G. and Tupitsyn, I. I. and Bondarev, I. A.} } @article {kalantre_anomalous_2020, title = {Anomalous phase dynamics of driven graphene {Josephson} junctions}, 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 = {Josephson junctions with weak links of exotic materials allow the elucidation of the Josephson effect in previously unexplored regimes. Further, such devices offer a direct probe of novel material properties, for example, in the search for Majorana fermions. In this paper, we report on dc and ac Josephson effect of high-mobility, hexagonal boron nitride encapsulated graphene Josephson junctions. On the application of rf radiation, we measure phase-locked Shapiro steps. An unexpected bistability between +/- 1 steps is observed with switching times on the order of seconds. A critical scaling of the bistable state is measured directly from the switching time, allowing for direct comparison to numerical simulations. We show such intermittent chaotic behavior is a consequence of the nonlinear dynamics of the junction and has a sensitive dependence on the current-phase relation. This paper draws connections between nonlinear phenomena in dynamical systems and their implications for ongoing condensed matter experiments exploring topology and exotic physics.}, doi = {10.1103/PhysRevResearch.2.023093}, author = {Kalantre, S. S. and Yu, F. and Wei, M. T. and Watanabe, K. and Taniguchi, T. and Hernandez-Rivera, M. and Amet, F. and Williams, J. R.} } @article {16636, title = {Autotuning of Double-Dot Devices In Situ with Machine Learning}, journal = {Phys. Rev. Applied}, volume = {13}, year = {2020}, month = {Mar}, pages = {034075}, doi = {10.1103/PhysRevApplied.13.034075}, url = {https://link.aps.org/doi/10.1103/PhysRevApplied.13.034075}, author = {Zwolak, Justyna P. and McJunkin, Thomas and Kalantre, Sandesh S. and Dodson, J.P. and MacQuarrie, E.R. and Savage, D.E. and Lagally, M.G. and Coppersmith, S.N. and Eriksson, Mark A. and Taylor, Jacob M.} } @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 {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:000564912400007, title = {Coherent optical nanotweezers for ultracold atoms}, journal = {Phys. Rev. A}, volume = {102}, number = {1}, year = {2020}, month = {JUL 7}, pages = {013306}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {There has been a recent surge of interest and progress in creating subwavelength free-space optical potentials for ultracold atoms. A key open question is whether geometric potentials, which are repulsive and ubiquitous in the creation of subwavelength free-space potentials, forbid the creation of narrow traps with long lifetimes. Here, we show that it is possible to create such traps. We propose two schemes for realizing subwavelength traps and demonstrate their superiority over existing proposals. We analyze the lifetime of atoms in such traps and show that long-lived bound states are possible. This work allows for subwavelength control and manipulation of ultracold matter, with applications in quantum chemistry and quantum simulation.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.102.013306}, author = {Bienias, P. and Subhankar, S. and Wang, Y. and Tsui, T-C and Jendrzejewski, F. and Tiecke, T. and Juzeliunas, G. and Jiang, L. and Rolston, S. L. and Porto, V, J. and Gorshkov, V, A.} } @article { ISI:000505979700006, title = {Collisions of room-temperature helium with ultracold lithium and the van der Waals bound state of HeLi}, journal = {Phys. Rev. A}, volume = {101}, number = {1}, year = {2020}, month = {JAN 6}, pages = {012702}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We have computed the thermally averaged total, elastic rate coefficient for the collision of a room-temperature helium atom with an ultracold lithium atom. This rate coefficient has been computed as part of the characterization of a cold-atom vacuum sensor based on laser-cooled Li-6 or Li-7 atoms that will operate in the ultrahigh-vacuum (p < 10(-6) Pa) and extreme-high-vacuum (p < 10(-10) Pa) regimes. The analysis involves computing the X (2) Sigma(+) HeLi Born-Oppenheimer potential followed by the numerical solution of the relevant radial Schrodinger equation. The potential is computed using a single-reference-coupled-cluster electronic-structure method with basis sets of different completeness in order to characterize our uncertainty budget. We predict that the rate coefficient for a 300 K helium gas and a 1 mu K Li gas is 1.467(13) x 10(-9) cm(3)/s for He-4 + Li-6 and 1.471(13) x 10(-9) cm(3)/s for He-4 + Li-7, where the numbers in parentheses are the one-standard-deviation uncertainties in the last two significant digits. We quantify the temperature dependence as well. Finally, we evaluate the s-wave scattering length and binding of the single van der Waals bound state of HeLi. We predict that this weakly bound level has a binding energy of -0.0064(43) x hc cm(-1) and -0.0122(67) x hc cm(-1) for He-4 + Li-6 and He-4 + Li-7, respectively. The calculated binding energy of He-4 + Li-7 is consistent with the sole experimental determination.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.101.012702}, author = {Makrides, Constantinos and Barker, Daniel S. and Fedchak, James A. and Scherschligt, Julia and Eckel, Stephen and Tiesinga, Eite} } @article {wu_competing_2020, title = {Competing quantum phases of hard-core bosons with tilted dipole-dipole interaction}, journal = {Phys. Rev. A}, volume = {102}, number = {5}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {nov}, abstract = {Different quantum phases of a hard-core boson induced by dipole-dipole interaction with varying angles of polarization are discussed in this work. We consider the two most influential leading terms with anisotropy due to the tilted polarization of the on-site boson in the square lattice. To ensure the concreteness of this truncation, we compare our phase diagrams, obtained numerically from the cluster mean-field theory (CMFT) and infinite projected entangled-pair state (iPEPS), with that of the long-range interacting model from quantum Monte Carlo. Next, we focus on the case where the azimuthal angle is fixed to phi = pi/4. Using the mean-field analysis where the quantum spin operators are replaced by c numbers, we aim to search for the underlying phases, especially the supersolid. Our results show a competing scenario mainly between two ordered phases with different sizes of unit cell, where a first-order transition takes place in between them. With the help of the CMFT and variational iPEPS, the phase boundaries predicted by the mean-field theory are determined more precisely. Our discoveries elucidate the possible underlying supersolid phases which might be seen in the ultracold experiments with strongly dipolar atoms. Moreover, our results indicate that an effective triangular optical lattice can be realized by fine tuning the polarization of dipoles in a square lattice.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.102.053306}, author = {Wu, Huan-Kuang and Tu, Wei-Lin} } @article {liang_cryspnet_2020, title = {{CRYSPNet}: {Crystal} structure predictions via neural networks}, journal = {Phys. Rev. Mater.}, volume = {4}, number = {12}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {dec}, abstract = {Structure is the most basic and important property of crystalline solids; it determines directly or indirectly most materials characteristics. However, predicting crystal structure of solids remains a formidable and not fully solved problem. Standard theoretical tools for this task are computationally expensive and at times inaccurate. Here we present an alternative approach utilizing machine learning for crystal structure prediction. We developed a tool called Crystal Structure Prediction Network (CRYSPNet) that can predict the Bravais lattice, space group, and lattice parameters of an inorganic material based only on its chemical composition. CRYSPNet consists of a series of neural network models, using as inputs predictors aggregating the properties of the elements constituting the compound. It was trained and validated on more than 100 000 entries from the Inorganic Crystal Structure Database. The tool demonstrates robust predictive capability and outperforms alternative strategies by a large margin. It can be used both as an independent prediction engine and as a method to generate candidate structures for further computational and/or experimental validation.

}, issn = {2475-9953}, doi = {10.1103/PhysRevMaterials.4.123802}, author = {Liang, Haotong and Stanev, Valentin and Kusne, A. Gilad and Takeuchi, Ichiro} } @article {tran_destructive_2020, title = {Destructive {Error} {Interference} in {Product}-{Formula} {Lattice} {Simulation}, journal = {Phys. Rev. Lett.}, volume = {124}, number = {22}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {jun}, abstract = {Quantum computers can efficiently simulate the dynamics of quantum systems. In this Letter, we study the cost of digitally simulating the dynamics of several physically relevant systems using the first-order product-formula algorithm. We show that the errors from different Trotterization steps in the algorithm can interfere destructively, yielding a much smaller error than previously estimated. In particular, we prove that the total error in simulating a nearest-neighbor interacting system of n sites for time t using the first-order product formula with r time slices is O(nt/r + nt(3)/r(2)) when nt(2)/r is less than a small constant. Given an error tolerance epsilon, the error bound yields an estimate of max\{O(n(2)t/epsilon), O(n(2)t(3/2)/epsilon(1/2))\} for the total gate count of the simulation. The estimate is tighter than previous bounds and matches the empirical performance observed in Childs et al. [Proc. Natl. Acad. Sci. U.S.A. 115, 9456 (2018)]. We also provide numerical evidence for potential improvements and conjecture an even tighter estimate for the gate count.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.124.220502}, author = {Tran, Minh C. and Chu, Su-Kuan and Su, Yuan and Childs, Andrew M. and Gorshkov, V, Alexey} } @article {tran_dynamical_2020, title = {Dynamical {Josephson} effects in {NbSe2}, 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 = {nov}, abstract = {The study of superconducting materials that also possess nontrivial correlations or interactions remains an active frontier of condensed matter physics. NbSe2 belongs to this class of superconductors and recent research has focused on the two-dimensional properties of this layered, superconducting material. Often, electronic transport measurements are used to investigate the superconducting properties of these materials, hence it is key to obtain a thorough understanding of transport in these systems. We investigate the transition between the superconducting and resistive state using radio-frequency AC excitation. Despite being a single piece of superconductor, the devices show novel dynamical Josephson effects behavior reminiscent of the AC Josephson effect observed in Josephson junctions. Detailed analysis uncovers the origin of this effect, identifying two types of vortex motion that categorize the transition to the normal state. Our results shed light on the nature of superconductivity in this material, unearthing exotic phenomena by exploiting nonequilibrium superconducting effects in atomically thin materials.}, doi = {10.1103/PhysRevResearch.2.043204}, author = {Tran, S. and Sell, J. and Williams, J. R.} } @article { ISI:000553250400007, title = {Efficient Ground-State Cooling of Large Trapped-Ion Chains with an Electromagnetically-Induced-Transparency Tripod Scheme}, journal = {Phys. Rev. Lett.}, volume = {125}, number = {5}, year = {2020}, month = {JUL 29}, pages = {053001}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We report the electromagnetically-induced-transparency (EIT) cooling of a large trapped Yb-171(+) ion chain to the quantum ground state. Unlike conventional EIT cooling, we engage a four-level tripod structure and achieve fast sub-Doppler cooling over all motional modes. We observe simultaneous groundstate cooling across the complete transverse mode spectrum of up to 40 ions, occupying a bandwidth of over 3 MHz. The cooling time is observed to be less than 300 mu s, independent of the number of ions. Such efficient cooling across the entire spectrum is essential for high-fidelity quantum operations using trapped ion crystals for quantum simulators or quantum computers.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.125.053001}, author = {Feng, L. and Tan, W. L. and De, A. and Menon, A. and Chu, A. and Pagano, G. and Monroe, C.} } @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 { ISI:000571392500002, title = {Fermion parity gap and exponential ground state degeneracy of the one-dimensional Fermi gas with intrinsic attractive interaction}, journal = {Phys. Rev. B}, volume = {102}, number = {12}, year = {2020}, month = {SEP 21}, pages = {125135}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We examine the properties of a one-dimensional (1D) Fermi gas with attractive intrinsic (Hubbard) interactions in the presence of spin-orbit coupling and Zeeman field by numerically computing the pair binding energy, excitation gap, and susceptibility to local perturbations using the density matrix renormalization group. Such a system can, in principle, be realized in a system of ultracold atoms confined in a 1D optical lattice. We note that, in the presence of spatial interfaces introduced by a smooth parabolic potential, the pair binding and excitation energy of the system decays exponentially with the system size, pointing to the existence of an exponential ground state degeneracy, and is consistent with recent works. However, the susceptibility of the ground state degeneracy of this number-conserving system to local impurities indicates that the energy gap vanishes as a power law with the system size in the presence of local perturbations. We compare this system with the more familiar system of an Ising antiferromagnet in the presence of a transverse field realized with Rydberg atoms and argue that the exponential splitting in the clean number-conserving 1D Fermi system is similar to a phase with only conventional order.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.102.125135}, author = {Roy, Monalisa Singh and Kumar, Manoranjan and Sau, Jay D. and Tewari, Sumanta} } @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:000552576600008, title = {Fidelity of a sequence of SWAP operations on a spin chain}, journal = {Phys. Rev. B}, volume = {102}, number = {3}, year = {2020}, month = {JUL 27}, pages = {035439}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We consider the {\textquoteleft}{\textquoteleft}transport{{\textquoteright}{\textquoteright}} of the state of a spin across a Heisenberg-coupled spin chain via the use of repeated SWAP gates, starting with one of two states-one in which the leftmost spin is down and the others up, and one in which the leftmost two spins are in a singlet state (i.e., they are entangled), and the others are again all up. More specifically, we transport the state of the leftmost spin in the first case and the next-to-leftmost spin in the second to the other end of the chain, and then back again. We accomplish our SWAP operations here by increasing the exchange coupling between the two spins that we operate on from a base value J to a larger value J(SWAP) for a time t = pi(h) over bar /4J(SWAP). We determine the fidelity of this sequence of operations in a number of situations-one in which only nearest-neighbor coupling exists between spins and there is no magnetic dipole-dipole coupling or noise (the most ideal case), one in which we introduce next-nearest-neighbor coupling, but none of the other effects, and one in which all of these effects are present. In the last case, the noise is assumed to be quasistatic, i.e., the exchange couplings are each drawn from a Gaussian distribution, truncated to only nonnegative values. We plot the fidelity as a function of JSWAP to illustrate various effects, namely crosstalk due to coupling to other spins, as well as noise, that are detrimental to our ability to perform a SWAP operation. Our theory should be useful to the ongoing experimental efforts in building semiconductor-based spin quantum computer architectures.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.102.035439}, author = {Throckmorton, Robert E. and Das Sarma, S.} } @article { ISI:000536153200001, title = {Figures of merit for quantum transducers}, journal = {Quantum Sci. Technol.}, volume = {5}, number = {3}, year = {2020}, month = {JUL}, pages = {034009}, publisher = {IOP PUBLISHING LTD}, type = {Article}, abstract = {Recent technical advances have sparked renewed interest in physical systems that couple simultaneously to different parts of the electromagnetic spectrum, thus enabling transduction of signals between vastly different frequencies at the level of single quanta. Such hybrid systems have demonstrated frequency conversion of classical signals and have the potential of enabling quantum state transfer, e.g., between superconducting circuits and traveling optical signals. This article describes a simple approach for the theoretical characterization of the performance of quantum transducers. Given that, in practice, one cannot attain ideal one-to-one quantum conversion, we explore how imperfections impact the performance of the transducer in various scenarios. We quantify how knowledge of the well-established transducer parameters signal transfer efficiency eta and added noise N suffices to assess its performance in a variety of transduction schemes ranging from classical signal detection to applications for quantum information processing.}, keywords = {quantum sensing, quantum transduction, transduction}, issn = {2058-9565}, doi = {10.1088/2058-9565/ab8962}, author = {Zeuthen, Emil and Schliesser, Albert and Sorensen, Anders S. and Taylor, Jacob M.} } @article { ISI:000562277400001, title = {Frustration-induced supersolid phases of extended Bose-Hubbard model in the hard-core limit}, journal = {J. Phys.-Condes. Matter}, volume = {32}, number = {45}, year = {2020}, month = {OCT 28}, pages = {455401}, publisher = {IOP PUBLISHING LTD}, type = {Article}, abstract = {We investigate exotic supersolid phases in the extended Bose-Hubbard model with infinite projected entangled-pair state, numerical exact diagonalization, and mean-field theory. We demonstrate that many different supersolid phases can be generated by changing signs of hopping terms, and the interactions along with the frustration of hopping terms are important to stabilize those supersolid states. We argue the effect of frustration introduced by the competition of hopping terms in the supersolid phases from the mean-field point of view. This helps to give a clearer picture of the background mechanism for underlying superfluid/supersolid states to be formed. With this knowledge, we predict and realize thed-wave superfluid, which shares the same pairing symmetry with high-T(c)materials, and its extended phases. We believe that our results contribute to preliminary understanding for desired target phases in the real-world experimental systems.}, keywords = {Bose-Hubbard model, exact diagonalization, phase diagrams, projected entangled pair states, superfluids, supersolids}, issn = {0953-8984}, doi = {10.1088/1361-648X/aba383}, author = {Tu, Wei-Lin and Wu, Huan-Kuang and Suzuki, Takafumi} } @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} } @article {kuehn_high_2020, title = {High {Resolution} {Photoexcitation} {Measurements} {Exacerbate} the {Long}-{Standing} {Fe} {XVII} {Oscillator} {Strength} {Problem}, journal = {Phys. Rev. Lett.}, volume = {124}, number = {22}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {jun}, abstract = {For more than 40 years, most astrophysical observations and laboratory studies of two key soft x-ray diagnostic 2p - 3d transitions, 3C and 3D, in Fe XVII ions found oscillator strength ratios f(3C)/f(3D) disagreeing with theory, but uncertainties had precluded definitive statements on this much studied conundrum. Here, we resonantly excite these lines using synchrotron radiation at PETRA III, and reach, at a millionfold lower photon intensities, a 10 times higher spectral resolution, and 3 times smaller uncertainty than earlier work. Our final result of f(3C)/f(3D) = 3.09(8)(6) supports many of the earlier clean astrophysical and laboratory observations, while departing by five sigmas from our own newest large-scale ab initio calculations, and excluding all proposed explanations, including those invoking nonlinear effects and population transfers.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.124.225001}, author = {Kuehn, Steffen and Shah, Chintan and Lopez-Urrutia, Jose R. Crespo and Fujii, Keisuke and Steinbruegge, Rene and Stierhof, Jakob and Togawa, Moto and Harman, Zoltan and Oreshkina, Natalia S. and Cheung, Charles and Kozlov, Mikhail G. and Porsev, Sergey G. and Safronova, Marianna S. and Berengut, Julian C. and Rosner, Michael and Bissinger, Matthias and Ballhausen, Ralf and Hell, Natalie and Park, SungNam and Chung, Moses and Hoesch, Moritz and Seltmann, Joern and Surzhykov, Andrey S. and Yerokhin, Vladimir A. and Wilms, Joern and Porter, F. Scott and Stoehlker, Thomas and Keitel, Christoph H. and Pfeifer, Thomas and Brown, V, Gregory and Leutenegger, Maurice A. and Bernitt, Sven} } @article {16901, title = {Imaging viscous flow of the Dirac fluid in graphene}, journal = {Nature}, volume = {583}, year = {2020}, month = {Jul}, pages = {537-541}, abstract = {The electron{\textendash}hole plasma in charge-neutral graphene is predicted to realize a quantum critical system in which electrical transport features a universal hydrodynamic description, even at room temperature1,2. This quantum critical {\textquoteleft}Dirac fluid{\textquoteright} is expected to have a shear viscosity close to a minimum bound3,4, with an interparticle scattering rate saturating1 at the Planckian time, the shortest possible timescale for particles to relax. Although electrical transport measurements at finite carrier density are consistent with hydrodynamic electron flow in graphene5{\textendash}8, a clear demonstration of viscous flow at the charge-neutrality point remains elusive. Here we directly image viscous Dirac fluid flow in graphene at room temperature by measuring the associated stray magnetic field. Nanoscale magnetic imaging is performed using quantum spin magnetometers realized with nitrogen vacancy centres in diamond. Scanning single-spin and wide-field magnetometry reveal a parabolic Poiseuille profile for electron flow in a high-mobility graphene channel near the charge-neutrality point, establishing the viscous transport of the Dirac fluid. This measurement is in contrast to the conventional uniform flow profile imaged in a metallic conductor and also in a low-mobility graphene channel. Via combined imaging and transport measurements, we obtain viscosity and scattering rates, and observe that these quantities are comparable to the universal values expected at quantum criticality. This finding establishes a nearly ideal electron fluid in charge-neutral, high-mobility graphene at room temperature4. Our results will enable the study of hydrodynamic transport in quantum critical fluids relevant to strongly correlated electrons in high-temperature superconductors9. This work also highlights the capability of quantum spin magnetometers to probe correlated electronic phenomena at the nanoscale.

}, issn = {1476-4687}, doi = {10.1038/s41586-020-2507-2}, url = {https://doi.org/10.1038/s41586-020-2507-2}, author = {Ku, Mark J. H. and Zhou, Tony X. and Li, Qing and Shin, Young J. and Shi, Jing K. and Burch, Claire and Anderson, Laurel E. and Pierce, Andrew T. and Xie, Yonglong and Hamo, Assaf and Vool, Uri and Zhang, Huiliang and Casola, Francesco and Taniguchi, Takashi and Watanabe, Kenji and Fogler, Michael M. and Kim, Philip and Yacoby, Amir and Walsworth, Ronald L.} } @article {li_improved_2020, title = {Improved coupled-mode theory for high-index-contrast photonic platforms}, journal = {Phys. Rev. A}, volume = {102}, number = {6}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {dec}, abstract = {Coupled-mode theory (CMT) has been widely used in optics and photonics design. Despite its popularity, several different formulations of CMT exist in the literature, and their applicable range is not entirely clear, in particular when it comes to high-index-contrast photonics platforms. Here we propose an improved formulation of CMT and demonstrate its superior performance through numerical simulations that compare CMT-derived quantities with supermode calculations and full wave propagation simulations. In particular, application of the improved CMT to asymmetric waveguides reveals a necessary correction in the conventional phase matching condition for high-index-contrast systems, which could lead to more accurate photonic circuit designs involving asymmetric elements.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.102.063506}, author = {Li, Qing and Moille, Gregory and Taheri, Hossein and Adibi, Ali and Srinivasan, Kartik} } @article {tsai_learning_2020, title = {Learning molecular dynamics with simple language model built upon long short-term memory neural network}, journal = {Nat. Commun.}, volume = {11}, number = {1}, year = {2020}, note = {Place: HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY Publisher: NATURE RESEARCH Type: Article}, month = {oct}, abstract = {Recurrent neural networks have led to breakthroughs in natural language processing and speech recognition. Here we show that recurrent networks, specifically long short-term memory networks can also capture the temporal evolution of chemical/biophysical trajectories. Our character-level language model learns a probabilistic model of 1-dimensional stochastic trajectories generated from higher-dimensional dynamics. The model captures Boltzmann statistics and also reproduces kinetics across a spectrum of timescales. We demonstrate how training the long short-term memory network is equivalent to learning a path entropy, and that its embedding layer, instead of representing contextual meaning of characters, here exhibits a nontrivial connectivity between different metastable states in the underlying physical system. We demonstrate our model{\textquoteright}s reliability through different benchmark systems and a force spectroscopy trajectory for multi-state riboswitch. We anticipate that our work represents a stepping stone in the understanding and use of recurrent neural networks for understanding the dynamics of complex stochastic molecular systems. Artificial neural networks have been successfully used for language recognition. Tsai et al. use the same techniques to link between language processing and prediction of molecular trajectories and show capability to predict complex thermodynamics and kinetics arising in chemical or biological physics.}, issn = {2041-1723}, doi = {10.1038/s41467-020-18959-8}, author = {Tsai, Sun-Ting and Kuo, En-Jui and Tiwary, Pratyush} } @article { ISI:000527491100005, title = {Magic wavelength of the Ba-138(+) 6s S-2(1/2)-5d D-2(5/2) clock transition}, journal = {Phys. Rev. A}, volume = {101}, number = {4}, year = {2020}, month = {APR 22}, pages = {042507}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The zero crossing of the dynamic differential scalar polarizability of the S-1/2 - D-5/2 clock transition in Ba-138(+) has been determined to be 459.1614(28) THz. Together with previously determined matrix elements and branching ratios, this tightly constrains the dynamic differential scalar polarizability of the clock transition over a large wavelength range (greater than or similar to 700 nm). In particular, it allows an estimate of the blackbody radiation shift of the clock transition at room temperature.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.101.042507}, author = {Chanu, S. R. and Koh, V. P. W. and Arnold, K. J. and Kaewuam, R. and Tan, T. R. and Zhang, Zhiqiang and Safronova, M. S. and Barrett, M. D.} } @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 { ISI:000550580800001, title = {Nonequilibrium Criticality in Quench Dynamics of Long-Range Spin Models}, journal = {Phys. Rev. Lett.}, volume = {125}, number = {4}, year = {2020}, month = {JUL 21}, pages = {040602}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Long-range interacting spin systems are ubiquitous in physics and exhibit a variety of ground-state disorder-to-order phase transitions. We consider a prototype of infinite-range interacting models known as the Lipkin-Meshkov-Glick model describing the collective interaction of N spins and investigate the dynamical properties of fluctuations and correlations after a sudden quench of the Hamiltonian. Specifically, we focus on critical quenches, where the initial state and/or the postquench Hamiltonian are critical. Depending on the type of quench, we identify three distinct behaviors where both the short-time dynamics and the stationary state at long times are effectively thermal, quantum, and genuinely nonequilibrium, characterized by distinct universality classes and static and dynamical critical exponents. These behaviors can be identified by an infrared effective temperature that is finite, zero, and infinite (the latter scaling with the system size as N-1/3), respectively. The quench dynamics is studied through a combination of exact numerics and analytical calculations utilizing the nonequilibrium Keldysh field theory. Our results are amenable to realization in experiments with trapped-ion experiments where long-range interactions naturally arise.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.125.040602}, author = {Titum, Paraj and Maghrebi, Mohammad F.} } @article {hao_nuclear_2020, title = {Nuclear spin-dependent parity-violating effects in light polyatomic molecules}, journal = {Phys. Rev. A}, volume = {102}, number = {5}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {nov}, abstract = {Measurements of nuclear spin-dependent parity-violating (NSD-PV) effects provide an excellent opportunity to test nuclear models and to search for physics beyond the Standard Model. Molecules possess closely spaced states with opposite parity which may be easily tuned to degeneracy to greatly enhance the observed parity-violating effects. A high-sensitivity measurement of NSD-PV effects using light triatomic molecules is in preparation [E. B. Norrgard et al., Common. Phys. 2, 77 (2019)]. Importantly, by comparing these measurements in light nuclei with prior and ongoing measurements in heavier systems, the contribution to NSD-PV from Z(0)-boson exchange between the electrons and the nuclei may be separated from the contribution of the nuclear anapole moment. Furthermore, light triatomic molecules offer the possibility to search for new particles, such as the postulated Z{\textquoteright} boson. In this work, we detail a sensitive measurement scheme and present high-accuracy molecular and nuclear calculations needed for interpretation of NSD-PV experiments on triatomic molecules composed of light elements, Be, Mg, N, and C. The ab initio nuclear structure calculations, performed within the no-core shell model provide a reliable prediction of the magnitude of different contributions to the NSD-PV effects in the four nuclei. These results differ significantly from the predictions of the standard single-particle model and highlight the importance of including many-body effects in such calculations. In order to extract the NSD-PV contributions from measurements, a parity-violating interaction parameter W-PV, which depends on the molecular structure, needs to be known with a high accuracy. We have calculated these parameters for the triatomic molecules of interest using the relativistic coupled-cluster approach. In order to facilitate the interpretation of future experiments we provide uncertainties on the calculated parameters. A scheme for measurement using laser-cooled polyatomic molecules in a molecular fountain is presented, along with an estimate of the expected sensitivity of such an experiment. This experimental scheme, combined with the presented state-of-the-art calculations, opens exciting prospects for a measurement of the anapole moment and the PV effects due to the electron-nucleon interactions with unprecedented accuracy and for a new path towards detection of signatures of physics beyond the Standard Model.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.102.052828}, author = {Hao, Yongliang and Navratil, Petr and Norrgard, Eric B. and Ilias, Miroslav and Eliav, Ephraim and Timmermans, Rob G. E. and Flambaum, Victor V. and Borschevsky, Anastasia} } @article { ISI:000548284200010, title = {Optical clocks based on the Cf15+ and Cf17+ ions}, journal = {Phys. Rev. A}, volume = {102}, number = {1}, year = {2020}, month = {JUL 6}, pages = {012802}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Recent experimental progress in cooling, trapping, and quantum logic spectroscopy of highly charged ions (HCIs) made HCIs accessible for high-resolution spectroscopy and precision fundamental studies. Based on these achievements, we explore a possibility to develop optical clocks using transitions between the ground and a low-lying excited state in Cf15+ and Cf17+ ions. Using a high-accuracy relativistic method of calculation, we predicted the wavelengths of clock transitions, calculated relevant atomic properties, and analyzed a number of systematic effects (such as the electric quadrupole, micromotion, and quadratic Zeeman shifts of the clock transitions) that affect the accuracy and stability of the optical clocks. We also calculated magnetic dipole hyperfine-structure constants of the clock states and the blackbody radiation shifts of the clock transitions.}, issn = {1050-2947}, doi = {10.1103/PhysRevA.102.012802}, author = {Porsev, S. G. and Safronova, I, U. and Safronova, M. S. and Schmidt, P. O. and Bondarev, I, A. and Kozlov, M. G. and Tupitsyn, I. I. and Cheung, C.} } @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 { ISI:000567752300004, title = {Probing XY phase transitions in a Josephson junction array with tunable frustration}, journal = {Phys. Rev. B}, volume = {102}, number = {9}, year = {2020}, month = {SEP 10}, pages = {094509}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {The seminal theoretical works of Berezinskii, Kosterlitz, and Thouless presented a paradigm for phase transitions in condensed matter that are driven by topological excitations. These transitions have been extensively studied in the context of two-dimensional XY models-coupled compasses-and have generated interest in the context of quantum simulation. Here, we use a circuit quantum-electrodynamics architecture to study the critical behavior of engineered XY models through their dynamical response. In particular, we examine not only the unfrustrated case but also the fully frustrated case which leads to enhanced degeneracy associated with the spin rotational {[}U(1)] and discrete chiral (Z(2)) symmetries. The nature of the transition in the frustrated case has posed a challenge for theoretical studies while direct experimental probes remain elusive. Here we identify the transition temperatures for both the unfrustrated and fully frustrated XY models by probing a Josephson junction array close to equilibrium using weak microwave excitations and measuring the temperature dependence of the effective damping obtained from the complex reflection coefficient. We argue that our probing technique is primarily sensitive to the dynamics of the U(1) part.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.102.094509}, author = {Cosmic, R. and Kawabata, K. and Ashida, Y. and Ikegami, H. and Furukawa, S. and Patil, P. and Taylor, J. M. and Nakamura, Y.} } @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 {pagano_quantum_2020, title = {Quantum approximate optimization of the long-range {Ising} model with a trapped-ion quantum simulator}, journal = {Proc. Natl. Acad. Sci. U. S. A.}, volume = {117}, number = {41}, year = {2020}, note = {Place: 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA Publisher: NATL ACAD SCIENCES Type: Article}, month = {oct}, pages = {25396{\textendash}25401}, abstract = {Quantum computers and simulators may offer significant advantages over their classical counterparts, providing insights into quantum many-body systems and possibly improving performance for solving exponentially hard problems, such as optimization and satisfiability. Here, we report the implementation of a low-depth Quantum Approximate Optimization Algorithm (QAOA) using an analog quantum simulator. We estimate the ground-state energy of the Transverse Field Ising Model with long-range interactions with tunable range, and we optimize the corresponding combinatorial classical problem by sampling the QAOA output with high-fidelity, single-shot, individual qubit measurements. We execute the algorithm with both an exhaustive search and closed-loop optimization of the variational parameters, approximating the ground-state energy with up to 40 trapped-ion qubits. We benchmark the experiment with bootstrapping heuristic methods scaling polynomially with the system size. We observe, in agreement with numerics, that the QAOA performance does not degrade significantly as we scale up the system size and that the runtime is approximately independent from the number of qubits. We finally give a comprehensive analysis of the errors occurring in our system, a crucial step in the path forward toward the application of the QAOA to more general problem instances.}, keywords = {computing, quantum, quantum algorithms, quantum information science, quantum simulation, trapped ions}, issn = {0027-8424}, doi = {10.1073/pnas.2006373117}, author = {Pagano, Guido and Bapat, Aniruddha and Becker, Patrick and Collins, Katherine S. and De, Arinjoy and Hess, Paul W. and Kaplan, Harvey B. and Kyprianidis, Antonis and Tan, Wen Lin and Baldwin, Christopher and Brady, Lucas T. and Deshpande, Abhinav and Liu, Fangli and Jordan, Stephen and Gorshkov, V, Alexey and Monroe, Christopher} } @article {anderson_realization_2020, title = {Realization of a deeply subwavelength adiabatic optical lattice}, 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 = {We propose and describe our realization of a deeply subwavelength optical lattice for ultracold neutral atoms using N resonantly Raman-coupled internal degrees of freedom. Although counterpropagating lasers with wavelength. provided two-photon Raman coupling, the resultant lattice period was lambda/2N, an N-fold reduction as compared to the conventional lambda/2 lattice period. We experimentally demonstrated this lattice built from the three F = 1 Zeeman states of a Rb-87 Bose-Einstein condensate, and generated a lattice with a lambda/6 = 132 nm period from lambda = 790 nm lasers. Lastly, we show that adding an additional rf-coupling field converts this lattice into a superlattice with N wells uniformly spaced within the original lambda/2 unit cell.}, doi = {10.1103/PhysRevResearch.2.013149}, author = {Anderson, R. P. and Trypogeorgos, D. and Valdes-Curiel, A. and Liang, Q-Y and Tao, J. and Zhao, M. and Andrijauskas, T. and Juzeliunas, G. and Spielman, I. B.} } @article { ISI:000526522500002, title = {Realization of a stroboscopic optical lattice for cold atoms with subwavelength spacing}, journal = {Phys. Rev. A}, volume = {101}, number = {4}, year = {2020}, month = {APR 17}, pages = {041603}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Optical lattices are typically created via the ac Stark shift and are limited by diffraction to periodicities >= lambda/2, where. is the wavelength of light used to create them. Lattices with smaller periodicities may be useful for many-body physics with cold atoms and can be generated by stroboscopic application of a phase-shifted lattice with subwavelength features. Here we demonstrate a lambda/4-spaced lattice by stroboscopically applying optical Kronig-Penney-like potentials which are generated using spatially dependent dark states. We directly probe the periodicity of the lambda/4-spaced lattice by measuring the average probability density of the atoms loaded into the ground band of the lattice. We measure lifetimes of atoms in this lattice and discuss the mechanisms that limit the applicability of this stroboscopic approach.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.101.041603}, author = {Tsui, T-C and Wang, Y. and Subhankar, S. and Porto, V, J. and Rolston, S. L.} } @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 {drake_simplify_2020, title = {Simplify your life}, journal = {Nat. Phys.}, volume = {16}, number = {12}, year = {2020}, note = {Place: HEIDELBERGER PLATZ 3, BERLIN, 14197, GERMANY Publisher: NATURE RESEARCH Type: Editorial Material}, month = {dec}, pages = {1242}, abstract = {Within the Hartree atomic unit systems, the Schrodinger equation becomes parameter free. But there{\textquoteright}s more to it than making a student{\textquoteright}s life easier, as Gordon Drake and Eite Tiesinga recount.}, issn = {1745-2473}, doi = {10.1038/s41567-020-01095-x}, author = {Drake, Gordon W. F. and Tiesinga, Eite} } @article {throckmorton_spontaneous_2020, title = {Spontaneous symmetry breaking in a honeycomb lattice subject to a periodic potential}, 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 = {may}, abstract = {Motivated by recent developments in twisted bilayer graphene moire superlattices, we investigate the effects of electron-electron interactions in a honeycomb lattice with an applied periodic potential using a finite-temperature Wilson-Fisher momentum shell renormalization group (RG) approach. We start with a low-energy effective theory for such a system, at first giving a discussion of the most general case in which no point group symmetry is preserved by the applied potential, and then focusing on the special case in which the potential preserves a D-3 point group symmetry. As in similar studies of bilayer graphene, we find that, while the coupling constants describing the interactions diverge at or below a certain critical temperature T = T-c, it turns out that ratios of these constants remain finite and in fact provide information about what types of orders the system is becoming unstable to. However, in contrast to these previous studies, we only find isolated fixed rays, indicating that these orders are likely unstable to perturbations to the coupling constants. Our RG analysis leads to the qualitative conclusion that the emergent interaction-induced symmetry-breaking phases in this model system, and perhaps therefore by extension in twisted bilayer graphene, are generically unstable and fragile, and may thus manifest strong sample dependence.}, doi = {10.1103/PhysRevResearch.2.023225}, author = {Throckmorton, Robert E. and Das Sarma, S.} } @article { ISI:000533504100003, title = {State-Dependent Optical Lattices for the Strontium Optical Qubit}, journal = {Phys. Rev. Lett.}, volume = {124}, number = {20}, year = {2020}, month = {MAY 18}, pages = {203201}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We demonstrate state-dependent optical lattices for the Sr optical qubit at the tune-out wavelength for its ground state. We tightly trap excited state atoms while suppressing the effect of the lattice on ground state atoms by more than 4 orders of magnitude. This highly independent control over the qubit states removes inelastic excited state collisions as the main obstacle for quantum simulation and computation schemes based on the Sr optical qubit. Our results also reveal large discrepancies in the atomic data used to calibrate the largest systematic effect of Sr optical lattice clocks.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.124.203201}, author = {Heinz, A. and Park, A. J. and Santi, N. and Trautmann, J. and Porsev, S. G. and Safronova, M. S. and Bloch, I and Blatt, S.} } @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 {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: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:000456032500004, title = {Conditions allowing error correction in driven qubits}, journal = {Phys. Rev. B}, volume = {99}, number = {4}, year = {2019}, month = {JAN 17}, pages = {045422}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We consider a qubit that is driven along its logical z axis, with noise along the z axis in the driving field Omega proportional to some function f (Omega), as well as noise along the logical x axis. We establish that whether or not errors due to both types of noise can be canceled out, even approximately, depends on the explicit functional form of f (Omega) by considering a power-law form, f (Omega) proportional to Omega(k). In particular, we show that such cancellation is impossible for k = 0, 1, or any even integer. However, any other odd integer value of k besides 1 does permit cancellation; in fact, we show that both types of errors can be corrected with a sequence of four square pulses of equal duration. We provide sets of parameters that correct for errors for various rotations and evaluate the error, measured by the infidelity, for the corrected rotations versus the naive rotations, i.e., the operations that, in the complete absence of noise, would produce the desired rotations (in this case a single pulse of appropriate duration and magnitude). We also consider a train of four trapezoidal pulses, which take into account the fact that there will be, in real experimental systems, a finite rise time, again providing parameters for error-corrected rotations that employ such pulse sequences. Our dynamical decoupling error correction scheme works for any qubit platform as long as the errors are quasistatic.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.99.045422}, author = {Throckmorton, Robert E. and S. Das Sarma} } @article {ISI:000464756500001, title = {Confined Quasiparticle Dynamics in Long-Range Interacting Quantum Spin Chains}, journal = {Phys. Rev. Lett.}, volume = {122}, number = {15}, year = {2019}, month = {APR 16}, pages = {150601}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We study the quasiparticle excitation and quench dynamics of the one-dimensional transverse-field Ising model with power-law (1/r(alpha)) interactions. We find that long-range interactions give rise to a confining potential, which couples pairs of domain walls (kinks) into bound quasiparticles, analogous to mesonic states in high-energy physics. We show that these quasiparticles have signatures in the dynamics of order parameters following a global quench, and the Fourier spectrum of these order parameters can be exploited as a direct probe of the masses of the confined quasiparticles. We introduce a two-kink model to qualitatively explain the phenomenon of long-range-interaction-induced confinement and to quantitatively predict the masses of the bound quasiparticles. Furthermore, we illustrate that these quasiparticle states can lead to slow thermalization of one-point observables for certain initial states. Our work is readily applicable to current trapped-ion experiments.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.122.150601}, author = {Liu, Fangli and Lundgren, Rex and Titum, Paraj and Pagano, Guido and Zhang, Jiehang and Monroe, Christopher and Gorshkov, V, Alexey} } @article { ISI:000447062400001, title = {Cryogenic trapped-ion system for large scale quantum simulation}, journal = {QUANTUM SCIENCE AND TECHNOLOGY}, volume = {4}, number = {1}, year = {2019}, month = {JAN}, pages = {UNSP 014004}, issn = {2058-9565}, doi = {10.1088/2058-9565/aae0fe}, author = {Pagano, G. and Hess, P. W. and Kaplan, H. B. and Tan, W. L. and Richerme, P. and Becker, P. and Kyprianidis, A. and Zhang, J. and Birckelbaw, E. and Hernandez, M. R. and Wu, Y. and Monroe, C.} } @article {ISI:000455814100005, title = {Dynamic polarizability measurements with Lu-176(+)}, journal = {Phys. Rev. A}, volume = {99}, number = {1}, year = {2019}, month = {JAN 15}, pages = {012510}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We measure the differential polarizability of the Lu-176(+) S-1(0) <-> D-3(1) clock transition at multiple wavelengths. This experimentally characterizes the differential dynamic polarizability for frequencies up to 372 THz and allows an experimental determination of the dynamic correction to the blackbody radiation shift for the clock transition. In addition, measurements at the near resonant wavelengths of 598 and 646 nm determine the two dominant contributions to the differential dynamic polarizability below 372 THz. These additional measurements are carried out by two independent methods to verify the validity of our methodology. We also carry out a theoretical calculation of the polarizabilities using the hybrid method that combines the configuration interaction (CI) and the coupled-cluster approaches, incorporating for the first time quadratic nonlinear terms and partial triple excitations in the coupled-cluster calculations. The experimental measurements of the vertical bar < D-3(1)parallel to r parallel to P-3(J)>vertical bar matrix elements provide high-precision benchmarks for this theoretical approach.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.99.012510}, author = {Arnold, K. J. and Kaewuam, R. and Tan, T. R. and Porsev, S. G. and Safronova, M. S. and Barrett, M. D.} } @article {ISI:000482136700013, title = {Dynamic suppression of Rayleigh backscattering in dielectric resonators}, journal = {Optica}, volume = {6}, number = {8}, year = {2019}, month = {AUG 20}, pages = {1016-1022}, publisher = {OPTICAL SOC AMER}, type = {Article}, abstract = {The ultimate limits of performance for any classical optical system are set by sub-wavelength fluctuations within the host material, which may be frozen-in or even dynamically induced. The most common manifestation of such subwavelength disorder is Rayleigh light scattering, which is observed in nearly all waveguiding technologies today and can lead to both irreversible radiative losses as well as undesirable intermodal coupling, While it has been shown that backscattering from disorder can be suppressed by breaking the time-reversal symmetry in magneto-optic and topological insulator materials, common optical dielectrics possess neither of these properties. Here, we demonstrate an optomechanical approach for dynamically suppressing Rayleigh backscattering within dielectric resonators. We achieve this by locally breaking the time-reversal symmetry in a silica resonator through a Brillouin scattering interaction that is available in all materials. Near-complete suppression of Rayleigh backscattering is experimentally confirmed through two independent measurements-the elimination of a commonly seen normal-mode splitting or {\textquoteleft}{\textquoteleft}doublet{{\textquoteright}{\textquoteright}} effect and by measurement of the reduction in intrinsic optical loss. Additionally, a reduction of the back-reflections caused by disorder is also observed. Our results provide new evidence that it is possible to dynamically suppress Rayleigh backscattering within any optical dielectric medium using time-reversal symmetry breaking, for achieving robust light propagation in spite of scatterers or defects. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement}, issn = {2334-2536}, doi = {10.1364/OPTICA.6.001016}, author = {Kim, Seunghwi and Taylor, Jacob M. and Bahl, Gaurav} } @article {ISI:000466237600004, title = {Elastic rate coefficients for Li+H-2 collisions in the calibration of a cold-atom vacuum standard}, journal = {Phys. Rev. A}, volume = {99}, number = {4}, year = {2019}, month = {APR 29}, pages = {042704}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Ongoing efforts at the National Institute of Standards and Technology in creating a cold-atom vacuum standard device have prompted theoretical investigations of atom-molecule collision processes that characterize its operation. Such a device will operate as a primary standard for the ultrahigh-vacuum and extreme-high-vacuum regimes. This device operates by relating loss of ultracold lithium atoms from a conservative trap by collisions with ambient atoms and molecules to the background density and thus pressure through the ideal gas law. The predominant background constituent in these environments is molecular hydrogen H-2. We compute the relevant Li+H-2 Born-Oppenheimer potential energy surface, paying special attention to its uncertainty. Coupled-channel calculations are then used to obtain total rate coefficients, which include momentum-changing elastic and inelastic processes. We find that inelastic rotational quenching of H-2 is negligible near room temperature. For a (T = 300)-K gas of H-2 and 1.0-mu K gas of Li atoms prepared in a single hyperfine state, the total rate coefficients are 6.0(1) x 10(-9) cm(3)/s for both Li-6 and Li-7 isotopes, where the number in parentheses corresponds to a one-standard-deviation combined statistical and systematic uncertainty. We find that a 10-K increase in the H-2 temperature leads to a 1.9\% increase in the rate coefficients for both isotopes. For Li temperatures up to 100 mu K, changes are negligible. Finally, a semiclassical Born approximation significantly overestimates the rate coefficients. The difference is at least ten times the uncertainty of the coupled-channel result.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.99.042704}, author = {Makrides, Constantinos and Barker, Daniel S. and Fedchak, James A. and Scherschligt, Julia and Eckel, Stephen and Tiesinga, Eite} } @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 {14901, title = {Generation and detection of spin-orbit coupled neutron beams}, journal = {Proceedings of the National Academy of Sciences}, volume = {116}, year = {2019}, pages = {20328{\textendash}20332}, abstract = {Extensive interest has been placed on the techniques to prepare and characterize optical and matter wave orbital angular momentum (OAM) beams and spin correlated OAM beams. They have been shown to be useful in a wide range of applications such as microscopy, quantum information processing, material characterization, and communication protocols. Here we demonstrate an observation of spin-orbit beams and lattices of spin-orbit beams with neutrons. Neutrons, which do not possess a charge and have significant mass, are probes of nature that are complementary to photons and electrons. The techniques shown here enable neutron OAM applications in material characterization and fundamental physics.Spin-orbit coupling of light has come to the fore in nanooptics and plasmonics, and is a key ingredient of topological photonics and chiral quantum optics. We demonstrate a basic tool for incorporating analogous effects into neutron optics: the generation and detection of neutron beams with coupled spin and orbital angular momentum. The 3He neutron spin filters are used in conjunction with specifically oriented triangular coils to prepare neutron beams with lattices of spin-orbit correlations, as demonstrated by their spin-dependent intensity profiles. These correlations can be tailored to particular applications, such as neutron studies of topological materials.

}, issn = {0027-8424}, doi = {10.1073/pnas.1906861116}, url = {https://www.pnas.org/content/116/41/20328}, author = {Sarenac, Dusan and Kapahi, Connor and Chen, Wangchun and Clark, Charles W. and Cory, David G. and Huber, Michael G. and Taminiau, Ivar and Zhernenkov, Kirill and Pushin, Dmitry A.} } @article { ISI:000493335100001, title = {Identification of advanced spin-driven thermoelectric materials via interpretable machine learning}, journal = {npj Comput. Mater.}, volume = {5}, year = {2019}, month = {OCT 30}, pages = {103}, publisher = {SPRINGERNATURE}, type = {Article}, abstract = {Machine learning is becoming a valuable tool for scientific discovery. Particularly attractive is the application of machine learning methods to the field of materials development, which enables innovations by discovering new and better functional materials. To apply machine learning to actual materials development, close collaboration between scientists and machine learning tools is necessary. However, such collaboration has been so far impeded by the black box nature of many machine learning algorithms. It is often difficult for scientists to interpret the data-driven models from the viewpoint of material science and physics. Here, we demonstrate the development of spin-driven thermoelectric materials with anomalous Nernst effect by using an interpretable machine learning method called factorized asymptotic Bayesian inference hierarchical mixture of experts (FAB/HMEs). Based on prior knowledge of material science and physics, we were able to extract from the interpretable machine learning some surprising correlations and new knowledge about spin-driven thermoelectric materials. Guided by this, we carried out an actual material synthesis that led to the identification of a novel spin-driven thermoelectric material. This material shows the largest thermopower to date.}, issn = {2057-3960}, doi = {10.1038/s41524-019-0241-9}, author = {Iwasaki, Yuma and Sawada, Ryohto and Stanev, Valentin and Ishida, Masahiko and Kirihara, Akihiro and Omori, Yasutomo and Someya, Hiroko and Takeuchi, Ichiro and Saitoh, Eiji and Yorozu, Shinichi} } @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:000456992300001, title = {Machine learning techniques for state recognition and auto-tuning in quantum dots}, journal = {NPJ QUANTUM INFORMATION}, volume = {5}, year = {2019}, month = {JAN 21}, pages = {6}, issn = {2056-6387}, doi = {10.1038/s41534-018-0118-7}, author = {Kalantre, Sandesh S. and Zwolak, Justyna P. and Ragole, Stephen and Wu, Xingyao and Zimmerman, Neil M. and Stewart, Jr., M. D. and Taylor, Jacob M.} } @article {ISI:000483578600012, title = {Measurements of the branching ratios for 6P(1/2) decays in Ba-138(+)}, journal = {Phys. Rev. A}, volume = {100}, number = {3}, year = {2019}, month = {SEP 3}, pages = {032503}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Measurement of the branching ratios for 6P(1/2) decays to 6S(1/2) and 5D(3/2) in Ba-138(+) are reported with the decay probability from 6P(1/2) to 5D(3/2) measured to be p = 0.268177 +/- (37)(stat)-(20)(sys). This result differs from a recent report by 12 sigma. A detailed account of systematics is given, and the likely source of the discrepancy is identified. The new value of the branching reported here is combined with previous experimental results to give a new estimate of tau = 7.855(10) ns for the 6P(1/2) lifetime. In addition, ratios of matrix elements calculated from theory are combined with experimental results to provide improved theoretical estimates of the 6P(3/2) lifetime and the associated matrix elements.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.100.032503}, author = {Arnold, K. J. and Chanu, S. R. and Kaewuam, R. and Tan, T. R. and Yeo, L. and Zhang, Zhiqiang and Safronova, M. S. and Barrett, M. D.} } @article {14436, title = {Nanoscale Atomic Density Microscopy}, journal = {Phys. Rev. X}, volume = {9}, year = {2019}, month = {Apr}, pages = {021002}, doi = {10.1103/PhysRevX.9.021002}, url = {https://link.aps.org/doi/10.1103/PhysRevX.9.021002}, author = {Subhankar, S. and Wang, Y. and Tsui, T-C. and Rolston, S. L. and Porto, J. V.} } @article {ISI:000461126600036, title = {Optical clock comparison for Lorentz symmetry testing}, journal = {Nature}, volume = {567}, number = {7747}, year = {2019}, month = {MAR 14}, pages = {204+}, publisher = {NATURE PUBLISHING GROUP}, type = {Article}, abstract = {Questioning basic assumptions about the structure of space and time has greatly enhanced our understanding of nature. State-of-the-art atomic clocks(1-3) make it possible to precisely test fundamental symmetry properties of spacetime and search for physics beyond the standard model at low energies of just a few electronvolts(4). Modern tests of Einstein{\textquoteright}s theory of relativity try to measure so-far-undetected violations of Lorentz symmetry(5); accurately comparing the frequencies of optical clocks is a promising route to further improving such tests(6). Here we experimentally demonstrate agreement between two single-ion optical clocks at the 10(-18) level, directly validating their uncertainty budgets, over a six-month comparison period. The ytterbium ions of the two clocks are confined in separate ion traps with quantization axes aligned along non-parallel directions. Hypothetical Lorentz symmetry violations(5-7) would lead to periodic modulations of the frequency offset as the Earth rotates and orbits the Sun. From the absence of such modulations at the 10(-19) level we deduce stringent limits of the order of 10(-21) on Lorentz symmetry violation parameters for electrons, improving previous limits(8-10) by two orders of magnitude. Such levels of precision will be essential for low-energy tests of future quantum gravity theories describing dynamics at the Planck scale(4), which are expected to predict the magnitude of residual symmetry violations.}, issn = {0028-0836}, doi = {10.1038/s41586-019-0972-2}, author = {Sanner, Christian and Huntemann, Nils and Lange, Richard and Tamm, Christian and Peik, Ekkehard and Safronova, Marianna S. and Porsev, Sergey G.} } @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 {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:000466809600017, title = {QUANTUM INFORMATION The US National Quantum Initiative: From Act to action}, journal = {Science}, volume = {364}, number = {6439}, year = {2019}, month = {MAY 3}, pages = {440-442}, publisher = {AMER ASSOC ADVANCEMENT SCIENCE}, type = {Editorial Material}, issn = {0036-8075}, doi = {10.1126/science.aax0578}, author = {Monroe, Christopher and Raymer, Michael G. and Taylor, Jacob} } @article { ISI:000503978100047, title = {Repeated measurements with minimally destructive partial-transfer absorption imaging}, journal = {Opt. Express}, volume = {27}, number = {25}, year = {2019}, month = {DEC 9}, pages = {36611-36624}, publisher = {OPTICAL SOC AMER}, type = {Article}, abstract = {We demonstrate partial-transfer absorption imaging as a technique for repeatedly imaging an ultracold atomic ensemble with minimal perturbation. We prepare an atomic cloud in a state that is dark to the imaging light. We then use a microwave pulse to coherently transfer a small fraction of the ensemble to a bright state, which we image using in situ absorption imaging. The amplitude or duration of the microwave pulse controls the fractional transfer from the dark to the bright state. For small transfer fractions, we can image the atomic cloud up to 50 times before it is depleted. As a sample application, we repeatedly image an atomic cloud oscillating in a dipole trap to measure the trap frequency. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement}, issn = {1094-4087}, doi = {10.1364/OE.27.036611}, author = {Seroka, Erin Marshall and Curiel, Ana Valdes and Trypogeorgos, Dimitrios and Lundblad, Nathan and Spielman, Ian B.} } @article {ISI:000482530000002, title = {A semiclassical theory of phase-space dynamics of interacting bosons}, journal = {J. Phys. B-At. Mol. Opt. Phys.}, volume = {52}, number = {18}, year = {2019}, month = {SEP 28}, pages = {185302}, publisher = {IOP PUBLISHING LTD}, type = {Article}, abstract = {We study the phase-space representation of dynamics of bosons in the semiclassical regime where the occupation number of the modes is large. To this end, we employ the van Vleck-Gutzwiller propagator to obtain an approximation for the Green{\textquoteright}s function of the Wigner distribution. The semiclassical analysis incorporates interference of classical paths and reduces to the truncated Wigner approximation (TWA) when the interference is ignored. Furthermore, we identify the Ehrenfest time after which the TWA fails. As a case study, we consider a single-mode quantum nonlinear oscillator, which displays collapse and revival of observables. We analytically show that the interference of classical paths leads to revivals, an effect that is not reproduced by the TWA or a perturbative analysis.}, keywords = {Bose-Einstein condensates, phase-space dynamics, semiclassical physics}, issn = {0953-4075}, doi = {10.1088/1361-6455/ab319c}, author = {Mathew, R. and Tiesinga, E.} } @article {ISI:000478993000006, title = {Simulation of the coupling strength of capacitively coupled singlet-triplet qubits}, journal = {Phys. Rev. B}, volume = {100}, number = {7}, year = {2019}, month = {AUG 6}, pages = {075411}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We consider a system of two purely capacitively coupled singlet-triplet qubits and numerically simulate the energy structure of four electrons in two double quantum dots with a large potential barrier between them. We calculate the interqubit coupling strength using an extended Hund-Mulliken approach which includes excited orbitals in addition to the lowest-energy orbital for each quantum dot. We show the coupling strength as a function of the qubit separation as well as plotting it against the detunings of the two double quantum dots and show that the general qualitative features of our results can be captured by a potential-independent toy model of the system.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.100.075411}, author = {Buterakos, Donovan and Throckmorton, Robert E. and S. Das Sarma} } @article {ISI:000479034100005, title = {Suppressing Inhomogeneous Broadening in a Lutetium Multi-ion Optical Clock}, journal = {Phys. Rev. Lett.}, volume = {123}, number = {6}, year = {2019}, month = {AUG 7}, pages = {063201}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We demonstrate precision measurement and control of inhomogeneous broadening in a multi-ion clock consisting of three Lu-176(+) ions. Microwave spectroscopy between hyperfine states in the D-3(1) level is used to characterize differential systematic shifts between ions, most notably those associated with the electric quadrupole moment. By appropriate alignment of the magnetic field, we demonstrate suppression of these effects to the similar to 10(-17) level relative to the S-1(0) <-> D-3(1) optical transition frequency. Correlation spectroscopy on the optical transition demonstrates the feasibility of a 10-s Ramsey interrogation in the three ion configuration with a corresponding projection noise limited stability of sigma(tau) = 8.2 x 10(-17)/root tau.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.123.063201}, author = {Tan, T. R. and Kaewuam, R. and Arnold, K. J. and Chanu, S. R. and Zhang, Zhiqiang and Safronova, M. S. and Barrett, M. D.} } @article {ISI:000461940700022, title = {Switchable detector array scheme to reduce the effect of single-photon detector{\textquoteright}s deadtime in a multi-bit/photon quantum link}, journal = {Opt. Commun.}, volume = {441}, year = {2019}, month = {JUN 15}, pages = {132-137}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, abstract = {{We explore the use of a switchable single-photon detector (SPD) array scheme to reduce the effect of a detector{\textquoteright}s deadtime for a multi-bit/photon quantum link. The case of data encoding using M possible orbital-angular-momentum (OAM) states is specifically studied in this paper. Our method uses N SPDs with a controllable M x N optical switch and we use a Monte Carlo-based method to simulate the quantum detection process. The simulation results show that with the use of the switchable SPD array, the detection system can allow a higher incident photon rate than what might otherwise be limited by detectors{\textquoteright} deadtime. For the case of M = 4}, keywords = {orbital angular momentum, quantum communication, Single photon detection}, issn = {0030-4018}, doi = {10.1016/j.optcom.2019.01.081}, author = {Liu, Cong and Ren, Yongxiong and Zhao, Jiapeng and Mirhosseini, Mohammad and Rafsanjani, Seyed Mohammad Hashemi and Xie, Guodong and Pang, Kai and Song, Haoqian and Zhao, Zhe and Wang, Zhe and Li, Long and Bienfang, Joshua C. and Migdall, Alan and Brun, Todd A. and Tur, Moshe and Boyd, Robert W. and Willner, Alan E.} } @article {ISI:000455826000001, title = {Tabletop experiments for quantum gravity: a user{\textquoteright}s manual}, journal = {Class. Quantum Gravity}, volume = {36}, number = {3}, year = {2019}, month = {FEB 7}, pages = {034001}, publisher = {IOP PUBLISHING LTD}, type = {Article}, abstract = {Recent advances in cooling, control, and measurement of mechanical systems in the quantum regime have opened the possibility of the first direct observation of quantum gravity, at scales achievable in experiments. This paper gives a broad overview of this idea, using some matter-wave and optomechanical systems to illustrate the predictions of a variety of models of low-energy quantum gravity. We first review the treatment of perturbatively quantized general relativity as an effective quantum field theory, and consider the particular challenges of observing quantum effects in this framework. We then move on to a variety of alternative models, such as those in which gravity is classical, emergent, or responsible for a breakdown of quantum mechanics.}, keywords = {experimental tests, Optomechanics, quantum gravity}, issn = {0264-9381}, doi = {10.1088/1361-6382/aaf9ca}, author = {Carney, Daniel and Stamp, Philip C. E. and Taylor, Jacob M.} } @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:000459920900007, title = {Topological Insulators in Twisted Transition Metal Dichalcogenide Homobilayers}, journal = {Phys. Rev. Lett.}, volume = {122}, number = {8}, year = {2019}, month = {FEB 28}, pages = {086402}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We show that moire bands of twisted homobilayers can be topologically nontrivial, and illustrate the tendency by studying valence band states in +/- K valleys of twisted bilayer transition metal dichalcogenides, in particular, bilayer MoTe2. Because of the large spin-orbit splitting at the monolayer valence band maxima, the low energy valence states of the twisted bilayer MoTe2 at the +K (-K) valley can be described using a two-band model with a layer-pseudospin magnetic field Delta(r) that has the moire period. We show that Delta(r) has a topologically nontrivial skyrmion lattice texture in real space, and that the topmost moire valence bands provide a realization of the Kane-Mele quantum spin-Hall model, i. e., the two-dimensional time-reversal-invariant topological insulator. Because the bands narrow at small twist angles, a rich set of broken symmetry insulating states can occur at integer numbers of electrons per moire cell.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.122.086402}, author = {Wu, Fengcheng and Lovorn, Timothy and Tutuc, Emanuel and Martin, Ivar and MacDonald, A. H.} } @article { ISI:000515524300011, title = {Use of quantum effects as potential qualifying metrics for "quantum grade silicon"}, journal = {AIP Adv.}, volume = {9}, number = {12}, year = {2019}, month = {DEC 1}, pages = {125153}, publisher = {AMER INST PHYSICS}, type = {Article}, abstract = {Across solid state quantum information, material deficiencies limit performance through enhanced relaxation, charge defect motion, or isotopic spin noise. While classical measurements of device performance provide cursory guidance, specific qualifying metrics and measurements applicable to quantum devices are needed. For quantum applications, new material metrics, e.g., enrichment, are needed, while existing classical metrics such as mobility might be relaxed compared to conventional electronics. In this work, we examine locally grown silicon that is superior in enrichment, but inferior in chemical purity compared to commercial-silicon, as part of an effort to underpin the material standards needed for quantum grade silicon and establish a standard approach for the intercomparison of these materials. We use a custom, mass-selected ion beam deposition technique, which has produced isotopic enrichment levels up to 99.999 98\% Si-28, to isotopically enrich Si-28, but with chemical purity \>99.97\% due to the molecular beam epitaxy techniques used. From this epitaxial silicon, we fabricate top-gated Hall bar devices simultaneously on Si-28 and on the adjacent natural abundance Si substrate for intercomparison. Using standard-methods, we measure maximum mobilities of approximate to(1740 +/- 2) cm(2)/(V s) at an electron density of (2.7 x 10(12) +/- 3 x 10(8)) cm(-2) and approximate to(6040 +/- 3) cm(2)/(V s) at an electron density of (1.2 x 10(12) +/- 5 x 10(8)) cm(-2) at T = 1.9 K for devices fabricated on Si-28 and Si-nat, respectively. For magnetic fields B \> 2 T, both devices demonstrate well developed Shubnikov-de Haas oscillations in the longitudinal magnetoresistance. This provides the transport characteristics of isotopically enriched Si-28 and will serve as a benchmark for the classical transport of Si-28 at its current state and low temperature, epitaxially grown Si for quantum devices more generally. (C) 2019 Author(s).

}, doi = {10.1063/1.5128098}, author = {Ramanayaka, A. N. and Tang, Ke and Hagmann, J. A. and Kim, Hyun-Soo and Simons, D. S. and Richter, C. A. and Pomeroy, J. M.} } @article { ISI:000490121400025, title = {Weakly bound molecules as sensors of new gravity like forces}, journal = {Sci Rep}, volume = {9}, year = {2019}, month = {OCT 15}, pages = {14807}, publisher = {NATURE PUBLISHING GROUP}, type = {Article}, abstract = {Several extensions to the Standard Model of particle physics, including light dark matter candidates and unification theories predict deviations from Newton{\textquoteright}s law of gravitation. For macroscopic distances, the inverse-square law of gravitation is well confirmed by astrophysical observations and laboratory experiments. At micrometer and shorter length scales, however, even the state-of-the-art constraints on deviations from gravitational interaction, whether provided by neutron scattering or precise measurements of forces between macroscopic bodies, are currently many orders of magnitude larger than gravity itself. Here we show that precision spectroscopy of weakly bound molecules can be used to constrain non-Newtonian interactions between atoms. A proof-of-principle demonstration using recent data from photoassociation spectroscopy of weakly bound Yb-2 molecules yields constraints on these new interactions that are already close to state-of-the-art neutron scattering experiments. At the same time, with the development of the recently proposed optical molecular clocks, the neutron scattering constraints could be surpassed by at least two orders of magnitude.}, issn = {2045-2322}, doi = {10.1038/s41598-019-51346-y}, author = {Borkowski, Mateusz and Buchachenko, Alexei A. and Ciurylo, Roman and Julienne, Paul S. and Yamada, Hirotaka and Kikuchi, Yuu and Takasu, Yosuke and Takahashi, Yoshiro} } @article {ISI:000423432700002, title = {Absence of thermalization in finite isolated interacting Floquet systems}, journal = {PHYSICAL REVIEW B}, volume = {97}, number = {1}, year = {2018}, month = {JAN 29}, pages = {014311}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Conventional wisdom suggests that the long-time behavior of isolated interacting periodically driven (Floquet) systems is a featureless maximal-entropy state characterized by an infinite temperature. Efforts to thwart this uninteresting fixed point include adding sufficient disorder to realize a Floquet many-body localized phase or working in a narrow region of drive frequencies to achieve glassy nonthermal behavior at long time. Here we show that in clean systems the Floquet eigenstates can exhibit nonthermal behavior due to finite system size. We consider a one-dimensional system of spinless fermions with nearest-neighbor interactions where the interaction term is driven. Interestingly, even with no static component of the interaction, the quasienergy spectrum contains gaps and a significant fraction of the Floquet eigenstates, at all quasienergies, have nonthermal average doublon densities. We show that this nonthermal behavior arises due to emergent integrability at large interaction strength and discuss how the integrability breaks down with power-law dependence on system size.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9950}, doi = {10.1103/PhysRevB.97.014311}, author = {Seetharam, Karthik and Titum, Paraj and Kolodrubetz, Michael and Refael, Gil} } @article { ISI:000433912300001, title = {An autonomous single-piston engine with a quantum rotor}, journal = {QUANTUM SCIENCE AND TECHNOLOGY}, volume = {3}, number = {3}, year = {2018}, month = {JUL}, pages = {UNSP 035008}, keywords = {autonomous heat engine, quantum thermodynamics, rotor heat engine}, issn = {2058-9565}, doi = {10.1088/2058-9565/aac40d}, author = {Roulet, Alexandre and Nimmrichter, Stefan and Taylor, Jacob M.} } @article { ISI:000450960700005, title = {Bell monogamy relations in arbitrary qubit networks}, journal = {PHYSICAL REVIEW A}, volume = {98}, number = {5}, year = {2018}, month = {NOV 20}, pages = {052325}, issn = {2469-9926}, doi = {10.1103/PhysRevA.98.052325}, author = {Tran, M. C. and Ramanathan, R. and McKague, M. and Kaszlikowski, D. and Paterek, T.} } @article {ISI:000431374900011, title = {Beyond triplet: Unconventional superconductivity in a spin-3/2 topological semimetal}, journal = {SCIENCE ADVANCES}, volume = {4}, number = {4}, year = {2018}, month = {APR}, pages = {eaao4513}, publisher = {AMER ASSOC ADVANCEMENT SCIENCE}, type = {Article}, abstract = {In all known fermionic superfluids, Cooper pairs are composed of spin-1/2 quasi-particles that pair to formeither spinsinglet or spin-triplet bound states. The {\textquoteleft}{\textquoteleft}spin{{\textquoteright}{\textquoteright}} of a Bloch electron, however, is fixed by the symmetries of the crystal and the atomic orbitals from which it is derived and, in some cases, can behave as if it were a spin-3/2 particle. The superconducting state of such a system allows pairing beyond spin-triplet, with higher spin quasi-particles combining to formquintet or septet pairs. We report evidence of unconventional superconductivity emerging from a spin-3/2 quasi-particle electronic structure in the half-Heusler semimetal YPtBi, a low-carrier density noncentrosymmetric cubic material with a high symmetry that preserves the p-like j = 3/2 manifold in the Bi-based Gamma(8) band in the presence of strong spin-orbit coupling. With a striking linear temperature dependence of the London penetration depth, the existence of line nodes in the superconducting order parameter Delta is directly explained by a mixed-parity Cooper pairing model with high total angular momentum, consistent with a high-spin fermionic superfluid state. We propose a k.p model of the j = 3/2 fermions to explain how a dominant J = 3 septet pairing state is the simplest solution that naturally produces nodes in the mixed even-odd parity gap. Together with the underlying topologically nontrivial band structure, the unconventional pairing in this system represents a truly novel form of superfluidity that has strong potential for leading the development of a new series of topological superconductors.

}, issn = {2375-2548}, doi = {10.1126/sciadv.aao4513}, author = {Kim, Hyunsoo and Wang, Kefeng and Nakajima, Yasuyuki and Hu, Rongwei and Ziemak, Steven and Syers, Paul and Wang, Limin and Hodovanets, Halyna and Denlinger, Jonathan D. and Brydon, Philip M. R. and Agterberg, Daniel F. and Tanatar, Makariy A. and Prozorov, Ruslan and Paglione, Johnpierre} } @article { ISI:000444740400001, title = {Challenges to miniaturizing cold atom technology for deployable vacuum metrology}, journal = {METROLOGIA}, volume = {55}, number = {5}, year = {2018}, month = {OCT}, pages = {S182-S193}, keywords = {cold atom sensing, quantum-SI, vacuum metrology}, issn = {0026-1394}, doi = {10.1088/1681-7575/aadbe4}, author = {Eckel, Stephen and Barker, Daniel S. and Fedchak, James A. and Klimov, Nikolai N. and Norrgard, Eric and Scherschligt, Julia and Makrides, Constantinos and Tiesinga, Eite} } @article { ISI:000428617600038, title = {A coherent spin-photon interface in silicon}, journal = {NATURE}, volume = {555}, number = {7698}, year = {2018}, month = {MAR 29}, pages = {599+}, issn = {0028-0836}, doi = {10.1038/nature25769}, author = {Mi, X. and Benito, M. and Putz, S. and Zajac, D. M. and Taylor, J. M. and Burkard, Guido and Petta, J. R.} } @article { ISI:000423433700007, title = {Crosstalk error correction through dynamical decoupling of single-qubit gates in capacitively coupled singlet-triplet semiconductor spin qubits}, journal = {PHYSICAL REVIEW B}, volume = {97}, number = {4}, year = {2018}, month = {JAN 29}, pages = {045431}, issn = {2469-9950}, doi = {10.1103/PhysRevB.97.045431}, author = {Buterakos, Donovan and Throckmorton, Robert E. and S. Das Sarma} } @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 {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 { ISI:000437843700001, title = {Effective renormalized multi-body interactions of harmonically confined ultracold neutral bosons (vol 14, 053037, 2012)}, journal = {NEW JOURNAL OF PHYSICS}, volume = {20}, year = {2018}, month = {JUL 6}, pages = {079501}, issn = {1367-2630}, doi = {10.1088/1367-2630/aacf78}, author = {Johnson, P. R. and Blume, D. and Yin, X. Y. and Flynn, W. F. and Tiesinga, E.} } @article { ISI:000425507400010, title = {Electro-mechano-optical detection of nuclear magnetic resonance}, journal = {OPTICA}, volume = {5}, number = {2}, year = {2018}, month = {FEB 20}, pages = {152-158}, issn = {2334-2536}, doi = {10.1364/OPTICA.5.000152}, author = {Takeda, Kazuyuki and Nagasaka, Kentaro and Noguchi, Atsushi and Yamazaki, Rekishu and Nakamura, Yasunobu and Iwase, Eiji and Taylor, Jacob M. and Usami, Koji} } @article { ISI:000447310800001, title = {Electrooptomechanical Equivalent Circuits for Quantum Transduction}, journal = {PHYSICAL REVIEW APPLIED}, volume = {10}, number = {4}, year = {2018}, month = {OCT 15}, pages = {044036}, issn = {2331-7019}, doi = {10.1103/PhysRevApplied.10.044036}, author = {Zeuthen, Emil and Schliesser, Albert and Taylor, Jacob M. and Sorensen, Anders S.} } @article { ISI:000438672400001, title = {Energy-level statistics in strongly disordered systems with power-law hopping}, journal = {PHYSICAL REVIEW B}, volume = {98}, number = {1}, year = {2018}, month = {JUL 16}, pages = {014201}, issn = {2469-9950}, doi = {10.1103/PhysRevB.98.014201}, author = {Titum, Paraj and Quito, Victor L. and Syzranov, V, Sergey} } @conference { ISI:000450231900084, title = {Epitaxial Graphene p-n Junctions}, booktitle = {2018 CONFERENCE ON PRECISION ELECTROMAGNETIC MEASUREMENTS (CPEM 2018)}, year = {2018}, note = {Conference on Precision Electromagnetic Measurements (CPEM), Paris, FRANCE, JUL 08-13, 2018}, keywords = {epitaxial graphene, graphene p-n junction, quantum Hall effect, resistance standard}, isbn = {978-1-5386-0974-3}, author = {Hu, Jiuning and Kruskopf, Mattias and Yang, Yanfei and Wu, Bi-Yi and Tian, Jifa and Panna, Alireza and Rigosi, Albert F. and Lee, Hsin-Yen and Payagala, Shamith and Jones, George R. and Kraft, Marlin E. and Jarrett, Dean G. and Watanabe, Kenji and Taniguchi, Takashi and Elmquist, Randolph E. and Newell, David B.} } @article { ISI:000437110200003, title = {Error correction for gate operations in systems of exchange-coupled singlet-triplet qubits in double quantum dots}, journal = {PHYSICAL REVIEW B}, volume = {98}, number = {3}, year = {2018}, month = {JUL 3}, pages = {035406}, issn = {2469-9950}, doi = {10.1103/PhysRevB.98.035406}, author = {Buterakos, Donovan and Throckmorton, Robert E. and S. Das Sarma} } @article { ISI:000446554000001, title = {Failure of Kohn{\textquoteright}s theorem and the apparent failure of the f-sum rule in intrinsic Dirac-Weyl materials in the presence of a filled Fermi sea}, journal = {PHYSICAL REVIEW B}, volume = {98}, number = {15}, year = {2018}, month = {OCT 5}, pages = {155112}, issn = {2469-9950}, doi = {10.1103/PhysRevB.98.155112}, author = {Throckmorton, Robert E. and S. Das Sarma} } @article { ISI:000426845500044, title = {Fractal universality in near-threshold magnetic lanthanide dimers}, journal = {SCIENCE ADVANCES}, volume = {4}, number = {2}, year = {2018}, month = {FEB}, pages = {UNSP eaap8308}, issn = {2375-2548}, doi = {10.1126/sciadv.aap8308}, author = {Makrides, Constantinos and Li, Ming and Tiesinga, Eite and Kotochigova, Svetlana} } @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:000425091300007, title = {High-fidelity quantum gates in Si/SiGe double quantum dots}, journal = {PHYSICAL REVIEW B}, volume = {97}, number = {8}, year = {2018}, month = {FEB 15}, pages = {085421}, issn = {2469-9950}, doi = {10.1103/PhysRevB.97.085421}, author = {Russ, Maximilian and Zajac, D. M. and Sigillito, A. J. and Borjans, F. and Taylor, J. M. and Petta, J. R. and Burkard, Guido} } @article { ISI:000447148100013, title = {Long spin-flip time and large Zeeman splitting of holes in type-II ZnTe/ZnSe submonolayer quantum dots}, journal = {JOURNAL OF APPLIED PHYSICS}, volume = {124}, number = {14}, year = {2018}, month = {OCT 14}, pages = {144306}, issn = {0021-8979}, doi = {10.1063/1.5041478}, author = {Ji, H. and Dhomkar, S. and Wu, R. and Ludwig, J. and Lu, Z. and Smirnov, D. and Tamargo, M. C. and Bryant, G. W. and Kuskovsky, I. L.} } @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: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:000450584900008, title = {Observation of bound state self-interaction in a nano-eV atom collider}, journal = {NATURE COMMUNICATIONS}, volume = {9}, year = {2018}, month = {NOV 20}, pages = {4895}, issn = {2041-1723}, doi = {10.1038/s41467-018-07375-8}, author = {Thomas, Ryan and Chilcott, Matthew and Tiesinga, Eite and Deb, Amita B. and Kjaergaard, Niels} } @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:000428647300012, title = {Optomechanical approach to controlling the temperature and chemical potential of light}, journal = {PHYSICAL REVIEW A}, volume = {97}, number = {3}, year = {2018}, month = {MAR 29}, pages = {033850}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Massless particles, including photons, are not governed by particle conservation law during their typical interaction with matter even at low energies and thus have no chemical potential. However, in driven systems, near-equilibrium dynamics can lead to equilibration of photons with a finite number, describable using an effective chemical potential {[}M. Hafezi et al., Phys. Rev. B 92, 174305 (2015)]. Here we build upon this general concept with an implementation appropriate for a photon-based quantum simulator. We consider how laser cooling of a well-isolated mechanical mode can provide an effective low-frequency bath for the quantum simulator system. We show that the use of auxiliary photon modes, coupled by the mechanical system, enables control of both the chemical potential and temperature of the resulting photonic quantum simulator{\textquoteright}s grand canonical ensemble.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9926}, doi = {10.1103/PhysRevA.97.033850}, author = {Wang, Chiao-Hsuan and Taylor, Jacob M.} } @article { ISI:000433905200011, title = {Orbital quantum magnetism in spin dynamics of strongly interacting magnetic lanthanide atoms}, journal = {PHYSICAL REVIEW A}, volume = {97}, number = {5}, year = {2018}, month = {MAY 31}, pages = {053627}, issn = {2469-9926}, doi = {10.1103/PhysRevA.97.053627}, author = {Li, Ming and Tiesinga, Eite and Kotochigova, Svetlana} } @article { ISI:000436968900002, title = {Perpetual emulation threshold of PT-symmetric Hamiltonians}, journal = {JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL}, volume = {51}, number = {32}, year = {2018}, month = {AUG 10}, pages = {325302}, keywords = {non-Hermitian, pseudospins, PT-symmetry}, issn = {1751-8113}, doi = {10.1088/1751-8121/aacc5e}, author = {Trypogeorgos, D. and Valdes-Curiell, A. and Ian B Spielman and Emary, C.} } @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:000442483400036, title = {Photonic topological Anderson insulators}, journal = {NATURE}, volume = {560}, number = {7719}, year = {2018}, month = {AUG 23}, pages = {461+}, issn = {0028-0836}, doi = {10.1038/s41586-018-0418-2}, author = {Stutzer, Simon and Plotnik, Yonatan and Lumer, Yaakov and Titum, Paraj and Lindner, Netanel H. and Segev, Mordechai and Rechtsman, Mikael C. and Szameit, Alexander} } @article { ISI:000451606600001, title = {Plasmon-pole approximation for many-body effects in extrinsic graphene}, journal = {PHYSICAL REVIEW B}, volume = {98}, number = {19}, year = {2018}, month = {NOV 28}, pages = {195140}, abstract = {We develop the plasmon-pole approximation (PPA) theory for calculating the carrier self-energy of extrinsic graphene as a function of doping density within analytical approximations to the GW random phase approximation (GW-RPA). Our calculated self-energy shows excellent quantitative agreement with the corresponding full GW-RPA calculation results in spite of the simplicity of the PPA, establishing the general validity of the plasmon-pole approximation scheme. We also provide a comparison between the PPA and the hydrodynamic approximation in graphene, and comment on the experimental implications of our findings.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.98.195140}, author = {Hwang, E. H. and Throckmorton, Robert E. and S. Das Sarma} } @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:000447638200072, title = {QFlow lite dataset: A machine-learning approach to the charge states in quantum dot experiments}, journal = {PLOS ONE}, volume = {13}, number = {10}, year = {2018}, month = {OCT 17}, pages = {e0205844}, issn = {1932-6203}, doi = {10.1371/journal.pone.0205844}, author = {Zwolak, Justyna P. and Kalantre, Sandesh S. and Wu, Xingyao and Ragole, Stephen and Taylor, Jacob M.} } @article { ISI:000428145500001, title = {Quantum receiver for large alphabet communication}, journal = {OPTICA}, volume = {5}, number = {3}, year = {2018}, month = {MAR 20}, pages = {227-232}, issn = {2334-2536}, doi = {10.1364/OPTICA.5.000227}, author = {Burenkov, I. A. and Tikhonova, O. V. and Polyakov, S. V.} } @article { ISI:000423283200042, title = {Resonantly driven CNOT gate for electron spins}, journal = {SCIENCE}, volume = {359}, number = {6374}, year = {2018}, month = {JAN 26}, pages = {439-442}, issn = {0036-8075}, doi = {10.1126/science.aao5965}, author = {Zajac, D. M. and Sigillito, A. J. and Russ, M. and Borjans, F. and Taylor, J. M. and Burkard, G. and Petta, J. R.} } @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 {ISI:000423107800020, title = {Synthetic clock transitions via continuous dynamical decoupling}, journal = {PHYSICAL REVIEW A}, volume = {97}, number = {1}, year = {2018}, month = {JAN 16}, pages = {013407}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Decoherence of quantum systems due to uncontrolled fluctuations of the environment presents fundamental obstacles in quantum science. Clock transitions which are insensitive to such fluctuations are used to improve coherence, however, they are not present in all systems or for arbitrary system parameters. Here we create a trio of synthetic clock transitions using continuous dynamical decoupling in a spin-1 Bose-Einstein condensate in which we observe a reduction of sensitivity to magnetic-field noise of up to four orders of magnitude; this work complements the parallelwork byAnderson et al. {[}R. P. Anderson et al., following paper, Phys. Rev. A 97, 013408 (2018)]. In addition, using a concatenated scheme, we demonstrate suppression of sensitivity to fluctuations in our control fields. These field-insensitive states represent an ideal foundation for the next generation of cold-atom experiments focused on fragile many-body phases relevant to quantum magnetism, artificial gauge fields, and topological matter.}, \%\%Address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, issn = {2469-9926}, doi = {10.1103/PhysRevA.97.013407}, author = {Trypogeorgos, D. and Valdes-Curiel, A. and Lundblad, N. and Ian B Spielman} } @article { ISI:000446802800024, title = {Towards epitaxial graphene p-n junctions as electrically programmable quantum resistance standards}, journal = {SCIENTIFIC REPORTS}, volume = {8}, year = {2018}, month = {OCT 9}, pages = {15018}, issn = {2045-2322}, doi = {10.1038/s41598-018-33466-z}, author = {Hu, Jiuning and Rigosi, Albert F. and Kruskopf, Mattias and Yang, Yanfei and Wu, Bi-Yi and Tian, Jifa and Panna, Alireza R. and Lee, Hsin-Yen and Payagala, Shamith U. and Jones, George R. and Kraft, Marlin E. and Jarrett, Dean G. and Watanabe, Kenji and Taniguchi, Takashi and Elmquist, Randolph E. and Newell, David B.} } @article { ISI:000440602300120, title = {Towards superconductivity in p-type delta-doped Si/Al/Si heterostructures}, journal = {AIP ADVANCES}, volume = {8}, number = {7}, year = {2018}, month = {JUL}, pages = {075329}, issn = {2158-3226}, doi = {10.1063/1.5045338}, author = {Ramanayaka, A. N. and Kim, Hyun-Soo and Hagmann, J. A. and Murray, R. E. and Tang, Ke and Meisenkothen, F. and Zhang, H. R. and Bendersky, L. A. and Davydov, A. V. and Zimmerman, Neil M. and Richter, C. A. and Pomeroy, J. M.} } @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:000423107800027, title = {Ultracold atoms in multiple radio-frequency dressed adiabatic potentials}, journal = {PHYSICAL REVIEW A}, volume = {97}, number = {1}, year = {2018}, month = {JAN 16}, pages = {013616}, issn = {2469-9926}, doi = {10.1103/PhysRevA.97.013616}, author = {Harte, T. L. and Bentine, E. and Luksch, K. and Barker, A. J. and Trypogeorgos, D. and Yuen, B. and Foot, C. J.} } @article { ISI:000449675500001, title = {Unsupervised phase mapping of X-ray diffraction data by nonnegative matrix factorization integrated with custom clustering}, journal = {NPJ COMPUTATIONAL MATERIALS}, volume = {4}, year = {2018}, month = {AUG 6}, pages = {UNSP 43}, issn = {2057-3960}, doi = {10.1038/s41524-018-0099-2}, author = {Stanev, Valentin and Vesselinov, Velimir V. and Kusne, A. Gilad and Antoszewski, Graham and Takeuchi, Ichiro and Alexandrov, Boian S.} } @article {10331, title = {Weak-link Josephson Junctions Made from Topological Crystalline Insulators}, journal = {Phys. Rev. Lett.}, volume = {121}, year = {2018}, month = {Aug}, pages = {097701}, doi = {10.1103/PhysRevLett.121.097701}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.121.097701}, author = {Snyder, R. A. and Trimble, C. J. and Rong, C. C. and Folkes, P. A. and Taylor, P. J. and James R. Williams} } @article { ISI:000409458000006, title = {Above-threshold scattering about a Feshbach resonance for ultracold atoms in an optical collider}, journal = {NATURE COMMUNICATIONS}, volume = {8}, year = {2017}, month = {SEP 6}, issn = {2041-1723}, doi = {10.1038/s41467-017-00458-y}, author = {Horvath, Milena S. J. and Thomas, Ryan and Tiesinga, Eite and Deb, Amita B. and Kjaergaard, Niels} } @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 {7276, title = {Cooling a Harmonic Oscillator by Optomechanical Modification of Its Bath}, journal = {Phys. Rev. Lett.}, volume = {118}, year = {2017}, month = {May}, pages = {223602}, doi = {10.1103/PhysRevLett.118.223602}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.118.223602}, author = {Xu, Xunnong and Purdy, Thomas and Taylor, Jacob M.} } @article { ISI:000411687800006, title = {Coulomb drag and counterflow Seebeck coefficient in bilayer-graphene double layers}, journal = {NANO ENERGY}, volume = {40}, year = {2017}, month = {OCT}, pages = {42-48}, issn = {2211-2855}, doi = {10.1016/j.nanoen.2017.07.035}, author = {Hu, J. and Wu, T. and Tian, J. and Klimov, N. N. and Newell, D. B. and Chen, Y. P.} } @article { ISI:000414365000002, title = {Development of a new UHV/XHV pressure standard (cold atom vacuum standard)}, journal = {METROLOGIA}, volume = {54}, number = {6}, year = {2017}, month = {DEC}, pages = {S125-S132}, issn = {0026-1394}, doi = {10.1088/1681-7575/aa8a7b}, author = {Scherschligt, Julia and Fedchak, James A. and Barker, Daniel S. and Eckel, Stephen and Klimov, Nikolai and Makrides, Constantinos and Tiesinga, Eite} } @article { ISI:000407711300002, title = {Disorder-induced transitions in resonantly driven Floquet topological insulators}, journal = {PHYSICAL REVIEW B}, volume = {96}, number = {5}, year = {2017}, month = {AUG 16}, issn = {2469-9950}, doi = {10.1103/PhysRevB.96.054207}, author = {Titum, Paraj and Lindner, Netanel H. and Refael, Gil} } @article { ISI:000407923500006, title = {Dispersive optical detection of magnetic Feshbach resonances in ultracold gases}, journal = {PHYSICAL REVIEW A}, volume = {96}, number = {2}, year = {2017}, month = {AUG 18}, issn = {2469-9926}, doi = {10.1103/PhysRevA.96.022705}, author = {Sawyer, Bianca J. and Horvath, Milena S. J. and Tiesinga, Eite and Deb, Amita B. and Kjaergaard, Niels} } @article { ISI:000407000100003, title = {Dynamically induced robust phonon transport and chiral cooling in an optomechanical system}, journal = {NATURE COMMUNICATIONS}, volume = {8}, year = {2017}, month = {AUG 7}, issn = {2041-1723}, doi = {10.1038/s41467-017-00247-7}, author = {Kim, Seunghwi and Xu, Xunnong and Taylor, Jacob M. and Bahl, Gaurav} } @article {ISI:000400662700004, title = {Effects of spin-orbit coupling on zero-energy bound states localized at magnetic impurities in multiband superconductors}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {20}, year = {2017}, month = {MAY 5}, abstract = {We investigate the effect of spin-orbit coupling on the in-gap bound states localized at magnetic impurities in multiband superconductors with unconventional (sign-changed) and conventional (sign-unchanged) s-wave pairing symmetry, which may be relevant to iron-based superconductors. Without spin-orbit coupling, for spin-singlet superconductors it is known that such bound states cross zero energy at a critical value of the impurity scattering strength and acquire a finite spin polarization. Moreover, the degenerate, spin-polarized, zero-energy bound states are unstable to applied Zeeman fields as well as a deviation of the impurity scattering strength away from criticality. Using a T-matrix formalism as well as analytical arguments, we show that, in the presence of spin-orbit coupling, the zero-energy bound states localized at magnetic impurities in unconventional, sign-changed, s-wave superconductors acquire surprising robustness to applied Zeeman fields and variation in the impurity scattering strength, an effect which is absent in the conventional, sign-unchanged, s-wave superconductors. Given that the iron-based multiband superconductors may possess a substantial spin-orbit coupling as seen in recent experiments, our results may provide one possible explanation to the recent observation of surprisingly robust zero bias scanning tunneling microscope peaks localized at magnetic impurities in iron-based superconductors provided the order parameter symmetry is sign changing s(+-)-wave.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.205107}, author = {Seo, Kangjun and Sau, Jay D. and Tewari, Sumanta} } @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: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:000415568700001, title = {Fast pulse sequences for dynamically corrected gates in singlet-triplet qubits}, journal = {PHYSICAL REVIEW B}, volume = {96}, number = {19}, year = {2017}, month = {NOV 17}, issn = {2469-9950}, doi = {10.1103/PhysRevB.96.195424}, author = {Throckmorton, Robert E. and Zhang, Chengxian and Yang, Xu-Chen and Wang, Xin and Barnes, Edwin and S. Das Sarma} } @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: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 { ISI:000413927000009, title = {Non-thermalization in trapped atomic ion spin chains}, journal = {PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES}, volume = {375}, number = {2108}, year = {2017}, month = {DEC 13}, issn = {1364-503X}, doi = {10.1098/rsta.2017.0107}, author = {Hess, P. W. and Becker, P. and Kaplan, H. B. and Kyprianidis, A. and Lee, A. C. and Neyenhuis, B. and Pagano, G. and Richerme, P. and Senko, C. and Smith, J. and Tan, W. L. and Zhang, J. and Monroe, C.} } @article {ISI:000395052200001, title = {Observation of optomechanical buckling transitions}, journal = {NATURE COMMUNICATIONS}, volume = {8}, year = {2017}, month = {MAR 1}, pages = {14481}, abstract = {Correlated phases of matter provide long-term stability for systems as diverse as solids, magnets and potential exotic quantum materials. Mechanical systems, such as buckling transition spring switches, can have engineered, stable configurations whose dependence on a control variable is reminiscent of non-equilibrium phase transitions. In hybrid optomechanical systems, light and matter are strongly coupled, allowing engineering of rapid changes in the force landscape, storing and processing information, and ultimately probing and controlling behaviour at the quantum level. Here we report the observation of first-and second-order buckling transitions between stable mechanical states in an optomechanical system, in which full control of the nature of the transition is obtained by means of the laser power and detuning. The underlying multiwell confining potential we create is highly tunable, with a sub-nanometre distance between potential wells. Our results enable new applications in photonics and information technology, and may enable explorations of quantum phase transitions and macroscopic quantum tunnelling in mechanical systems.}, issn = {2041-1723}, doi = {10.1038/ncomms14481}, author = {Xu, H. and Kemiktarak, U. and Fan, J. and Ragole, S. and Lawall, J. and Taylor, J. M.} } @article { ISI:000411527100054, title = {Optomechanical Analogy for Toy Cosmology with Quantized Scale Factor}, journal = {ENTROPY}, volume = {19}, number = {9}, year = {2017}, month = {SEP}, issn = {1099-4300}, doi = {10.3390/e19090485}, author = {Smiga, Joseph A. and Taylor, Jacob M.} } @article { ISI:000416312900008, title = {Probing the dielectric response of the interfacial buffer layer in epitaxial graphene via optical spectroscopy}, journal = {PHYSICAL REVIEW B}, volume = {96}, number = {19}, year = {2017}, month = {NOV 28}, issn = {2469-9950}, doi = {10.1103/PhysRevB.96.195437}, author = {Hill, Heather M. and Rigosi, Albert F. and Chowdhury, Sugata and Yang, Yanfei and Nguyen, Nhan V. and Tavazza, Francesca and Elmquist, Randolph E. and Newell, David B. and Walker, Angela R. Hight} } @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:000406262000010, title = {A room temperature continuous-wave nanolaser using colloidal quantum wells}, journal = {NATURE COMMUNICATIONS}, volume = {8}, year = {2017}, month = {JUL 26}, issn = {2041-1723}, doi = {10.1038/s41467-017-00198-z}, author = {Yang, Zhili and Pelton, Matthew and Fedin, Igor and Talapin, Dmitri V. and Waks, Edo} } @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 {7776, title = {State-to-state chemistry for three-body recombination in an ultracold rubidium gas}, journal = {Science}, volume = {358}, year = {2017}, pages = {921{\textendash}924}, abstract = {Crossed molecular beams have provided decades{\textquoteright} worth of knowledge into how quantum mechanics governs chemical reactivity. Nonetheless, the technique is generally limited to the collision of two partners. Wolf et al. report on a three-body process with full quantum state resolution. By cooling rubidium atoms to ultralow temperatures in an optical trap, they were able to observe dimer formation, stabilized by collision with a third atom, and extract the precise dependence of product states on the initial states of the atoms involved.Science, this issue p. 921Experimental investigation of chemical reactions with full quantum state resolution for all reactants and products has been a long-term challenge. Here we prepare an ultracold few-body quantum state of reactants and demonstrate state-to-state chemistry for the recombination of three spin-polarized ultracold rubidium (Rb) atoms to form a weakly bound Rb2 molecule. The measured product distribution covers about 90\% of the final products, and we are able to discriminate between product states with a level splitting as small as 20 megahertz multiplied by Planck{\textquoteright}s constant. Furthermore, we formulate propensity rules for the distribution of products, and we develop a theoretical model that predicts many of our experimental observations. The scheme can readily be adapted to other species and opens a door to detailed investigations of inelastic or reactive processes.

}, issn = {0036-8075}, doi = {10.1126/science.aan8721}, url = {http://science.sciencemag.org/content/358/6365/921}, author = {Wolf, Joschka and Dei{\ss}, Markus and Kr{\"u}kow, Artjom and Tiemann, Eberhard and Ruzic, Brandon P. and Wang, Yujun and D{\textquoteright}Incao, Jos{\'e} P. and Julienne, Paul S. and Denschlag, Johannes Hecker} } @article {ISI:000394660600014, title = {Theory of interaction-induced renormalization of Drude weight and plasmon frequency in chiral multilayer graphene}, journal = {PHYSICAL REVIEW B}, volume = {95}, number = {8}, year = {2017}, month = {FEB 21}, abstract = {We develop a theory for the optical conductivity of doped ABC-stacked multilayer graphene including the effects of electron-electron interactions. Applying the quantum kinetic formalism, we formulate a set of pseudospin Bloch equations that govern the dynamics of the nonequilibrium density matrix driven by an external ac electric field under the influence of Coulomb interactions. These equations reveal a dynamical mechanism that couples theDrude and interband responses arising from the chirality of pseudospin textures in multilayer graphene systems. We demonstrate that this results in an interaction-induced enhancement of the Drude weight and plasmon frequency strongly dependent on the pseudospin winding number. Using bilayer graphene as an example, we also study the influence of higher-energy bands and find that they contribute considerable renormalization effects not captured by a low-energy two-band description. We argue that this enhancement of Drude weight and plasmon frequency occurs generally in materials characterized by electronic chirality.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.95.085428}, author = {Li, Xiao and Tse, Wang-Kong} } @article { ISI:000414954400003, title = {Thermodynamic limits for optomechanical systems with conservative potentials}, journal = {PHYSICAL REVIEW B}, volume = {96}, number = {18}, year = {2017}, month = {NOV 13}, issn = {2469-9950}, doi = {10.1103/PhysRevB.96.184106}, author = {Ragole, Stephen and Xu, Haitan and Lawall, John and Taylor, Jacob M.} } @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 { 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: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:000383053400001, title = {Classification of topological quantum matter with symmetries}, journal = {REVIEWS OF MODERN PHYSICS}, volume = {88}, number = {3}, year = {2016}, month = {AUG 31}, issn = {0034-6861}, doi = {10.1103/RevModPhys.88.035005}, author = {Chiu, Ching-Kai and Teo, Jeffrey C. Y. and Schnyder, Andreas P. and Ryu, Shinsei} } @article { ISI:000368290900012, title = {Dynamics of an ion coupled to a parametric superconducting circuit}, journal = {PHYSICAL REVIEW A}, volume = {93}, number = {1}, year = {2016}, month = {JAN 14}, pages = {013412}, issn = {1050-2947}, doi = {10.1103/PhysRevA.93.013412}, author = {Kafri, Dvir and Adhikari, Prabin and Taylor, Jacob M.} } @article { ISI:000381485200004, title = {Dynamics of two coupled semiconductor spin qubits in a noisy environment}, journal = {PHYSICAL REVIEW B}, volume = {94}, number = {4}, year = {2016}, month = {JUL 27}, issn = {2469-9950}, doi = {10.1103/PhysRevB.94.045435}, author = {S. Das Sarma and Throckmorton, Robert E. and Wu, Yang-Le} } @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:000380952800001, title = {Enigmatic 12/5 fractional quantum Hall effect}, journal = {PHYSICAL REVIEW B}, volume = {94}, number = {7}, year = {2016}, month = {AUG 4}, issn = {2469-9950}, doi = {10.1103/PhysRevB.94.075108}, author = {Pakrouski, Kiryl and Troyer, Matthias and Wu, Yang-Le and S. Das Sarma and Peterson, Michael R.} } @article {6361, title = {Interacting Atomic Interferometry for Rotation Sensing Approaching the Heisenberg Limit}, journal = {Phys. Rev. Lett.}, volume = {117}, year = {2016}, month = {Nov}, pages = {203002}, doi = {10.1103/PhysRevLett.117.203002}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.117.203002}, author = {Ragole, Stephen and Taylor, Jacob M.} } @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:000399139100002, title = {Interrupted orbital motion in density-wave systems}, journal = {PHYSICAL REVIEW B}, volume = {94}, number = {20}, year = {2016}, month = {NOV 2}, abstract = {In conventional metals, electronic transport in a magnetic field is characterized by the motion of electrons along orbits on the Fermi surface, which usually causes an increase in the resistivity through averaging over velocities. Here, we show that large deviations from this behavior can arise in density-wave systems close to their ordering temperature. Specifically, enhanced scattering off collective fluctuations can lead to a change of direction of the orbital motion on reconstructed pockets. In weak magnetic fields, this leads to linear magnetoconductivity, the sign of which depends on the electric-field direction. At a critical magnetic field, the conductivity crosses zero for certain directions, signifying a thermodynamic instability of the density-wave state.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.94.205103}, author = {Breitkreiz, Maxim and Brydon, P. M. R. and Timm, Carsten} } @article {ISI:000386099300008, title = {Landauer formulation of photon transport in driven systems}, journal = {PHYSICAL REVIEW B}, volume = {94}, number = {15}, year = {2016}, month = {OCT 20}, pages = {155437}, abstract = {Understanding the behavior of light in nonequilibrium scenarios underpins much of quantum optics and optical physics. While lasers provide a severe example of a nonequilibrium problem, recent interests in the near-equilibrium physics of so-called photon gases, such as in Bose condensation of light or in attempts to make photonic quantum simulators, suggest one re-examine some near-equilibrium cases. Here we consider how a sinusoidal parametric coupling between two semi-infinite photonic transmission lines leads to the creation and flow of photons between the two lines. Our approach provides a photonic analog to the Landauer transport formula, and using nonequilbrium Green{\textquoteright}s functions, we can extend it to the case of an interacting region between two photonic leads where the sinusoid frequency plays the role of a voltage bias. Crucially, we identify both the mathematical framework and the physical regime in which photonic transport is directly analogous to electronic transport and regimes in which other behavior such as two-mode squeezing can emerge.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.94.155437}, author = {Wang, Chiao-Hsuan and Taylor, Jacob M.} } @article {4390, title = {Magnetic phases of spin-1 spin{\textendash}orbit-coupled Bose gases}, journal = {Nature Communications}, volume = {7}, year = {2016}, month = {03/2016}, pages = {10897}, abstract = {Phases of matter are characterized by order parameters describing the type and degree of order in a system. Here we experimentally explore the magnetic phases present in a near-zero temperature spin-1 spin{\textendash}orbit-coupled atomic Bose gas and the quantum phase transitions between these phases. We observe ferromagnetic and unpolarized phases, which are stabilized by spin{\textendash}orbit coupling{\textquoteright}s explicit locking between spin and motion. These phases are separated by a critical curve containing both first- and second-order transitions joined at a tricritical point. The first-order transition, with observed width as small as h {\texttimes} 4\ Hz, gives rise to long-lived metastable states. These measurements are all in agreement with theory.

}, doi = {10.1038/ncomms10897}, author = {Daniel L Campbell and Ryan M. Price and Andika Putra and Ana Vald{\'e}s-Curiel and Dimitrios Trypogeorgos and Ian B Spielman} } @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:000370245900009, title = {Noise-induced collective quantum state preservation in spin qubit arrays}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {8}, year = {2016}, month = {FEB 16}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.085420}, author = {Barnes, Edwin and Deng, Dong-Ling and Throckmorton, Robert E. and Wu, Yang-Le and S. Das Sarma} } @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:000376992800002, title = {Quantum model for entropic springs}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {21}, year = {2016}, month = {JUN 2}, pages = {214102}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.214102}, author = {Wang, Chiao-Hsuan and Taylor, Jacob M.} } @article {ISI:000383849400001, title = {Quantum-Enhanced Machine Learning}, journal = {PHYSICAL REVIEW LETTERS}, volume = {117}, number = {13}, year = {2016}, month = {SEP 20}, pages = {130501}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.117.130501}, author = {Dunjko, Vedran and Taylor, Jacob M. and Briegel, Hans J.} } @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:000387905800007, title = {Vortex nucleation in a Bose-Einstein condensate: from the inside out}, journal = {NEW JOURNAL OF PHYSICS}, volume = {18}, year = {2016}, month = {NOV 4}, pages = {113009}, abstract = {We observed a new mechanism for vortex nucleation in Bose-Einstein condensates (BECs) subject to synthetic magnetic fields. We made use of a strong synthetic magnetic field initially localized between a pair of merging BECs to rapidly create vortices in the bulk of the merged condensate. Unlike previous implementations and in agreement with our Gross-Pitaevskii equation simulations, our dynamical process rapidly injects vortices into our system{\textquoteright}s bulk, and with initial number in excess of the system{\textquoteright}s equilibrium vortex number.}, issn = {1367-2630}, doi = {10.1088/1367-2630/18/11/113009}, author = {Price, R. M. and Trypogeorgos, D. and Campbell, D. L. and Putra, A. and Valdes-Curiel, A. and Ian B Spielman} } @article { ISI:000360650200001, title = {Approaching the quantum limit for nanoplasmonics}, journal = {JOURNAL OF MATERIALS RESEARCH}, volume = {30}, number = {16}, year = {2015}, month = {AUG 28}, pages = {2389-2399}, issn = {0884-2914}, doi = {10.1557/jmr.2015.232}, author = {Townsend, Emily and Debrecht, Alex and Bryant, Garnett W.} } @article { ISI:000348761200002, title = {Bounds on quantum communication via Newtonian gravity}, journal = {NEW JOURNAL OF PHYSICS}, volume = {17}, year = {2015}, month = {JAN 15}, pages = {015006}, issn = {1367-2630}, doi = {10.1088/1367-2630/17/1/015006}, author = {D. Kafri and Milburn, G. J. and Taylor, J. M.} } @article { ISI:000365774000005, title = {Capacitively coupled singlet-triplet qubits in the double charge resonant regime}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {23}, year = {2015}, month = {DEC 1}, pages = {235301}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.235301}, author = {Srinivasa, V. and Taylor, J. M.} } @article {4107, title = {Chemical potential for light by parametric coupling}, journal = {Phys. Rev. B}, volume = {92}, year = {2015}, month = {Nov}, pages = {174305}, doi = {10.1103/PhysRevB.92.174305}, url = {http://link.aps.org/doi/10.1103/PhysRevB.92.174305}, author = {Hafezi, M. and Adhikari, P. and Taylor, J. M.} } @article { ISI:000357750100019, title = {CI-MBPT: A package of programs for relativistic atomic calculations based on a method combining configuration interaction and many-body perturbation theory}, journal = {COMPUTER PHYSICS COMMUNICATIONS}, volume = {195}, year = {2015}, month = {OCT}, pages = {199-213}, issn = {0010-4655}, doi = {10.1016/j.cpc.2015.05.007}, author = {Kozlov, M. G. and Porsev, S. G. and Safronova, M. S. and Tupitsyn, I. I.} } @article { ISI:000362341500009, title = {Degenerate Bose-Fermi mixtures of rubidium and ytterbium}, journal = {PHYSICAL REVIEW A}, volume = {92}, number = {4}, year = {2015}, month = {OCT 5}, issn = {1050-2947}, doi = {10.1103/PhysRevA.92.043604}, author = {Vaidya, V. D. and Tiamsuphat, J. and Rolston, S. L. and Porto, J. V.} } @article { ISI:000351069900081, title = {Demonstration of neutron detection utilizing open cell foam and noble gas scintillation}, journal = {APPLIED PHYSICS LETTERS}, volume = {106}, number = {9}, year = {2015}, month = {MAR 2}, issn = {0003-6951}, doi = {10.1063/1.4914001}, author = {Lavelle, C. M. and Coplan, M. and Miller, E. C. and Thompson, Alan K. and Kowler, A. L. and Vest, Robert E. and Yue, A. T. and Koeth, T. and Al-Sheikhly, M. and Clark, Charles W.} } @article { ISI:000365002800001, title = {Emergence of Chaotic Scattering in Ultracold Er and Dy}, journal = {PHYSICAL REVIEW X}, volume = {5}, number = {4}, year = {2015}, month = {NOV 19}, issn = {2160-3308}, doi = {10.1103/PhysRevX.5.041029}, author = {Maier, T. and Kadau, H. and Schmitt, M. and Wenzel, M. and Ferrier-Barbut, I. and Pfau, T. and Frisch, A. and Baier, S. and Aikawa, K. and Chomaz, L. and Mark, M. J. and Ferlaino, F. and Makrides, C. and Tiesinga, E. and Petrov, A. and Kotochigova, S.} } @article { ISI:000358373600004, title = {Equivalence of topological mirror superconductivity and chiral superconductivity in one dimension}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {4}, year = {2015}, month = {JUL 22}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.045421}, author = {Dumitrescu, Eugene and Sharma, Girish and Sau, Jay D. and Tewari, Sumanta} } @article { ISI:000360655900016, title = {Formation of strain-induced quantum dots in gated semiconductor nanostructures}, journal = {AIP ADVANCES}, volume = {5}, number = {8}, year = {2015}, month = {AUG}, issn = {2158-3226}, doi = {10.1063/1.4928320}, author = {Thorbeck, Ted and Zimmerman, Neil M.} } @article { ISI:000351634800008, title = {From membrane-in-the-middle to mirror-in-the-middle with a high-reflectivity sub-wavelength grating}, journal = {ANNALEN DER PHYSIK}, volume = {527}, number = {1-2, SI}, year = {2015}, month = {JAN}, pages = {81-88}, issn = {0003-3804}, doi = {10.1002/andp.201400142}, author = {Stambaugh, Corey and Xu, Haitan and Kemiktarak, Utku and Taylor, Jacob and Lawall, John} } @article { ISI:000348759300001, title = {Helical spin texture of surface states in topological superconductors}, journal = {NEW JOURNAL OF PHYSICS}, volume = {17}, year = {2015}, month = {JAN 15}, issn = {1367-2630}, doi = {10.1088/1367-2630/17/1/013016}, author = {Brydon, P. M. R. and Schnyder, Andreas P. and Timm, Carsten} } @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: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:000358919600009, title = {Large effective three-body interaction in a double-well optical lattice}, journal = {PHYSICAL REVIEW A}, volume = {92}, number = {2}, year = {2015}, month = {AUG 3}, issn = {1050-2947}, doi = {10.1103/PhysRevA.92.023602}, author = {Paul, Saurabh and Tiesinga, Eite} } @article {ISI:000351341100004, title = {Majorana fermions in chiral topological ferromagnetic nanowires}, journal = {PHYSICAL REVIEW B}, volume = {91}, number = {9}, year = {2015}, month = {MAR 12}, pages = {094505}, issn = {1098-0121}, doi = {10.1103/PhysRevB.91.094505}, author = {Dumitrescu, Eugene and Roberts, Brenden and Tewari, Sumanta and Sau, Jay D. and S. Das Sarma} } @article {ISI:000350480100001, title = {Majorana fermions in ferromagnetic chains on the surface of bulk spin-orbit coupled s-wave superconductors}, journal = {SCIENTIFIC REPORTS}, volume = {5}, year = {2015}, month = {MAR 6}, pages = {8880}, issn = {2045-2322}, doi = {10.1038/srep08880}, author = {Hui, Hoi-Yin and Brydon, P. M. R. and Sau, Jay D. and Tewari, S. and S. Das Sarma} } @article { ISI:000360331300001, title = {Many-body effects and ultraviolet renormalization in three-dimensional Dirac materials}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {11}, year = {2015}, month = {SEP 1}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.115101}, author = {Throckmorton, Robert E. and Hofmann, Johannes and Barnes, Edwin and S. Das Sarma} } @article { ISI:000348775000038, title = {Michelson-Morley analogue for electrons using trapped ions to test Lorentz symmetry}, journal = {NATURE}, volume = {517}, number = {7536}, year = {2015}, month = {JAN 29}, pages = {592-U357}, issn = {0028-0836}, doi = {10.1038/nature14091}, author = {Pruttivarasin, T. and Ramm, M. and Porsev, S. G. and Tupitsyn, I. I. and Safronova, M. S. and Hohensee, M. A. and Haeffner, H.} } @article { ISI:000362493400003, title = {Normal-state Nernst effect from bidirectional bond density wave state in high-T-c cuprates}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {15}, year = {2015}, month = {OCT 9}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.155114}, author = {Sharma, Girish and Liu, Chunxiao and Seo, Kangjun and Sau, J. D. and Tewari, Sumanta} } @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:000359938200016, title = {Optical Feshbach resonances: Field-dressed theory and comparison with experiments}, journal = {PHYSICAL REVIEW A}, volume = {92}, number = {2}, year = {2015}, month = {AUG 24}, issn = {1050-2947}, doi = {10.1103/PhysRevA.92.022709}, author = {Nicholson, T. L. and Blatt, S. and Bloom, B. J. and James R. Williams and Thomsen, J. W. and Ye, J. and Julienne, Paul S.} } @article { ISI:000353121400006, title = {Optimization of collisional Feshbach cooling of an ultracold nondegenerate gas}, journal = {PHYSICAL REVIEW A}, volume = {91}, number = {4}, year = {2015}, month = {APR 20}, issn = {1050-2947}, doi = {10.1103/PhysRevA.91.043626}, author = {Nuske, Marlon and Tiesinga, Eite and Mathey, L.} } @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 { 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 { ISI:000358372100002, title = {Proposal to probe quantum nonlocality of Majorana fermions in tunneling experiments}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {2}, year = {2015}, month = {JUL 22}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.020511}, author = {Sau, Jay D. and Swingle, Brian and Tewari, Sumanta} } @article { ISI:000348392400007, title = {Quantum nonlinear optics near optomechanical instabilities}, journal = {PHYSICAL REVIEW A}, volume = {91}, number = {1}, year = {2015}, month = {JAN 9}, pages = {013818}, issn = {1050-2947}, doi = {10.1103/PhysRevA.91.013818}, author = {Xu, Xunnong and Gullans, Michael and Taylor, Jacob M.} } @article { ISI:000354965000008, title = {Scaling of fluctuations in a trapped binary condensate}, journal = {PHYSICAL REVIEW A}, volume = {91}, number = {5}, year = {2015}, month = {MAY 15}, issn = {1050-2947}, doi = {10.1103/PhysRevA.91.053613}, author = {Bisset, R. N. and Wilson, R. M. and Ticknor, C.} } @article {ISI:000351188000005, title = {Scanning Localized Magnetic Fields in a Microfluidic Device with a Single Nitrogen Vacancy Center}, journal = {NANO LETTERS}, volume = {15}, number = {3}, year = {2015}, month = {MAR}, pages = {1481-1486}, issn = {1530-6984}, doi = {10.1021/nl503280u}, author = {Lim, Kangmook and Ropp, Chad and Shapiro, Benjamin and Taylor, Jacob M. and Waks, Edo} } @conference { ISI:000353409800002, title = {Scanning localized magnetic fields in microfluidic system using single spin in diamond nanocrystal}, booktitle = {Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XII}, series = {Proceedings of SPIE}, volume = {9337}, year = {2015}, note = {Conference on Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XII, San Francisco, CA, FEB 09-12, 2015}, isbn = {978-1-62841-427-1}, issn = {0277-786X}, doi = {10.1117/12.2076635}, author = {Lim, Kangmook and Shapiro, Benjamin and Taylor, Jacob and Waks, Edo}, editor = {Cartwright, AN and Nicolau, DV} } @article { ISI:000360520900006, title = {Self-heterodyne detection of the in situ phase of an atomic superconducting quantum interference device}, journal = {PHYSICAL REVIEW A}, volume = {92}, number = {3}, year = {2015}, month = {SEP 3}, pages = {033602}, issn = {1050-2947}, doi = {10.1103/PhysRevA.92.033602}, author = {Mathew, R. and Kumar, A. and Eckel, S. and F. Jendrzejewski and G. K. Campbell and Edwards, Mark and E. Tiesinga} } @article {2703, title = {Semiconductor double quantum dot micromaser}, journal = {Science}, volume = {347}, year = {2015}, pages = {285}, doi = {10.1126/science.aaa2501}, url = {http://www.sciencemag.org/content/347/6219/285.abstract}, author = {Y.-Y. Liu and J. Stehlik and C. Eichler and M. J. Gullans and J. M. Taylor and J. R. Petta} } @article { ISI:000361033900100, title = {Statistically background-free, phase-preserving parametric up-conversion with faint light}, journal = {OPTICS EXPRESS}, volume = {23}, number = {14}, year = {2015}, month = {JUL 13}, pages = {18671-18678}, issn = {1094-4087}, doi = {10.1364/OE.23.018671}, author = {Cheng, Y. -H. and Thomay, Tim and Solomon, Glenn S. and Migdall, Alan L. and Polyakov, Sergey V.} } @article { ISI:000366486600002, title = {Strong Loophole-Free Test of Local Realism}, journal = {PHYSICAL REVIEW LETTERS}, volume = {115}, number = {25}, year = {2015}, month = {DEC 16}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.115.250402}, author = {Shalm, Lynden K. and Meyer-Scott, Evan and Christensen, Bradley G. and Bierhorst, Peter and Wayne, Michael A. and Stevens, Martin J. and Gerrits, Thomas and Glancy, Scott and Hamel, Deny R. and Allman, Michael S. and Coakley, Kevin J. and Dyer, Shellee D. and Hodge, Carson and Lita, Adriana E. and Verma, Varun B. and Lambrocco, Camilla and Tortorici, Edward and Migdall, Alan L. and Zhang, Yanbao and Kumor, Daniel R. and Farr, William H. and Marsili, Francesco and Shaw, Matthew D. and Stern, Jeffrey A. and Abellan, Carlos and Amaya, Waldimar and Pruneri, Valerio and Jennewein, Thomas and Mitchell, Morgan W. and Kwiat, Paul G. and Bienfang, Joshua C. and Mirin, Richard P. and Knill, Emanuel and Nam, Sae Woo} } @article { ISI:000354548200001, title = {Surface instability in nodal noncentrosymmetric superconductors}, journal = {PHYSICAL REVIEW B}, volume = {91}, number = {18}, year = {2015}, month = {MAY 13}, issn = {1098-0121}, doi = {10.1103/PhysRevB.91.180503}, author = {Timm, Carsten and Rex, Stefan and Brydon, P. M. R.} } @article { ISI:000353704100004, title = {Systematic evaluation of an atomic clock at 2 x 10 (-18) total uncertainty}, journal = {NATURE COMMUNICATIONS}, volume = {6}, year = {2015}, month = {APR}, issn = {2041-1723}, doi = {10.1038/ncomms7896}, author = {Nicholson, T. L. and S. L. Campbell and Hutson, R. B. and Marti, G. E. and Bloom, B. J. and McNally, R. L. and Zhang, W. and Barrett, M. D. and Safronova, M. S. and Strouse, G. F. and Tew, W. L. and Ye, J.} } @article {2979, title = {Tunable Spin-Qubit Coupling Mediated by a Multielectron Quantum Dot}, journal = {Phys. Rev. Lett.}, volume = {114}, year = {2015}, month = {Jun}, pages = {226803}, doi = {10.1103/PhysRevLett.114.226803}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.114.226803}, author = {Srinivasa, V. and Xu, H. and Taylor, J. M.} } @article { ISI:000332222100016, title = {Bloch oscillations and quench dynamics of interacting bosons in an optical lattice}, journal = {PHYSICAL REVIEW A}, volume = {89}, number = {2}, year = {2014}, month = {FEB 10}, pages = {023606}, issn = {1050-2947}, doi = {10.1103/PhysRevA.89.023606}, author = {K W Mahmud and L Jiang and Eite Tiesinga and Philip R Johnson} } @article {2573, title = {Bottom-up superconducting and Josephson junction devices inside a group-IV semiconductor}, journal = {Nature Communications}, volume = {5}, year = {2014}, month = {07/2014}, pages = {4225}, doi = {10.1038/ncomms5225}, author = {Yun-Pil Shim and Tahan, C} } @article { ISI:000339085400003, title = {A classical channel model for gravitational decoherence}, journal = {NEW JOURNAL OF PHYSICS}, volume = {16}, year = {2014}, month = {JUN 26}, issn = {1367-2630}, doi = {10.1088/1367-2630/16/6/065020}, author = {D. Kafri and Taylor, J. M. and Milburn, G. J.} } @article { ISI:000344094100007, title = {Collapse and revivals for systems of short-range phase coherence}, journal = {NEW JOURNAL OF PHYSICS}, volume = {16}, year = {2014}, month = {OCT 7}, issn = {1367-2630}, doi = {10.1088/1367-2630/16/10/103009}, author = {Mahmud, K. W. and Jiang, L. and Johnson, P. R. and E. Tiesinga} } @article { ISI:000343942900001, title = {Dynamically decoupled three-body interactions with applications to interaction-based quantum metrology}, journal = {PHYSICAL REVIEW A}, volume = {90}, number = {4}, year = {2014}, month = {OCT 15}, issn = {1050-2947}, doi = {10.1103/PhysRevA.90.041602}, author = {Mahmud, K. W. and E. Tiesinga and Johnson, P. R.} } @article { ISI:000338653100001, title = {Effective field theory, three-loop perturbative expansion, and their experimental implications in graphene many-body effects}, journal = {PHYSICAL REVIEW B}, volume = {89}, number = {23}, year = {2014}, month = {JUN 25}, issn = {1098-0121}, doi = {10.1103/PhysRevB.89.235431}, author = {Barnes, Edwin and Hwang, E. H. and Throckmorton, R. E. and S. Das Sarma} } @article { ISI:000341267500002, title = {Engineering three-body interaction and Pfaffian states in circuit QED systems}, journal = {PHYSICAL REVIEW B}, volume = {90}, number = {6}, year = {2014}, month = {AUG 18}, pages = {060503}, issn = {1098-0121}, doi = {10.1103/PhysRevB.90.060503}, author = {M. Hafezi and Adhikari, P. and Taylor, J. M.} } @article { ISI:000343225200014, title = {Environment-assisted quantum control of a solid-state spin via coherent dark states}, journal = {NATURE PHYSICS}, volume = {10}, number = {10}, year = {2014}, month = {OCT}, pages = {725-730}, issn = {1745-2473}, doi = {10.1038/NPHYS3077}, author = {Hansom, Jack and Schulte, Carsten H. H. and Le Gall, Claire and Matthiesen, Clemens and Clarke, Edmund and Hugues, Maxime and Taylor, Jacob M. and Atatuere, Mete} } @article { ISI:000348513500057, title = {Fabrication of Uniform Nanoscale Cavities via Silicon Direct Wafer Bonding}, journal = {JOVE-JOURNAL OF VISUALIZED EXPERIMENTS}, number = {83}, year = {2014}, month = {JAN}, issn = {1940-087X}, doi = {10.3791/51179}, author = {Thomson, Stephen R. D. and Perron, Justin K. and Kimball, Mark O. and Mehta, Sarabjit and Gasparini, Francis M.} } @article { ISI:000344903500011, title = {Gold Nanorods with Sub-Nanometer Separation using Cucurbit{[}n]uril for SERS Applications}, journal = {SMALL}, volume = {10}, number = {21}, year = {2014}, month = {NOV 12}, pages = {4298-4303}, issn = {1613-6810}, doi = {10.1002/smll.201401063}, author = {Jones, Samuel T. and Taylor, Richard W. and Esteban, Ruben and Abo-Hamed, Enass K. and Bomans, Paul H. H. and Sommerdijk, Nico A. J. M. and Javier Aizpurua and Baumberg, Jeremy J. and Scherman, Oren A.} } @article { ISI:000337161700011, title = {High sensitivity optomechanical reference accelerometer over 10 kHz}, journal = {APPLIED PHYSICS LETTERS}, volume = {104}, number = {22}, year = {2014}, month = {JUN 2}, issn = {0003-6951}, doi = {10.1063/1.4881936}, author = {Cervantes, Felipe Guzman and Kumanchik, Lee and Pratt, Jon and Taylor, Jacob M.} } @article { ISI:000345514700018, title = {High-resolution, vacuum-ultraviolet absorption spectrum of boron trifluoride}, journal = {JOURNAL OF CHEMICAL PHYSICS}, volume = {141}, number = {19}, year = {2014}, month = {NOV 21}, issn = {0021-9606}, doi = {10.1063/1.4901324}, author = {Hughes, Patrick P. and Beasten, Amy and McComb, Jacob C. and Coplan, Michael A. and Al-Sheikhly, Mohamad and Thompson, Alan K. and Vest, Robert E. and Sprague, Matthew K. and Irikura, Karl K. and Clark, Charles W.} } @article { ISI:000345243400004, title = {Isotope shifts in francium isotopes Fr206-213 and Fr-221}, journal = {PHYSICAL REVIEW A}, volume = {90}, number = {5}, year = {2014}, month = {NOV 7}, issn = {1050-2947}, doi = {10.1103/PhysRevA.90.052502}, author = {Collister, R. and Gwinner, G. and Tandecki, M. and Behr, J. A. and Pearson, M. R. and Zhang, J. and Orozco, L. A. and Aubin, S. and Gomez, E. and FrPNC Collaboration} } @article { ISI:000349891600004, title = {Magnetic field response and chiral symmetry of time-reversal-invariant topological superconductors}, journal = {PHYSICAL REVIEW B}, volume = {90}, number = {24}, year = {2014}, month = {DEC 31}, issn = {1098-0121}, doi = {10.1103/PhysRevB.90.245438}, author = {Dumitrescu, Eugene and Sau, Jay D. and Tewari, Sumanta} } @article { ISI:000334680400064, title = {Noble gas excimer scintillation following neutron capture in boron thin films}, journal = {JOURNAL OF APPLIED PHYSICS}, volume = {115}, number = {14}, year = {2014}, month = {APR 14}, issn = {0021-8979}, doi = {10.1063/1.4871009}, author = {McComb, Jacob C. and Coplan, Michael A. and Al-Sheikhly, Mohamad and Thompson, Alan K. and Vest, Robert E. and Clark, Charles W.} } @article { ISI:000336436400013, title = {Nonequilibrium probe of paired electron pockets in the underdoped cuprates}, journal = {SOLID STATE COMMUNICATIONS}, volume = {189}, year = {2014}, month = {JUL}, pages = {63-67}, issn = {0038-1098}, doi = {10.1016/j.ssc.2014.03.015}, author = {Boyd, G. R. and Takei, S. and Victor M Galitski} } @article { ISI:000345858500056, title = {Offline trapping of Fr-221 in a magneto-optical trap from implantation of an Ac-225 ion beam}, journal = {JOURNAL OF INSTRUMENTATION}, volume = {9}, year = {2014}, month = {OCT}, issn = {1748-0221}, doi = {10.1088/1748-0221/9/10/P10013}, author = {Tandeck, M. and Zhang, J. and Aubin, S. and Behr, J. A. and Collister, R. and Gomez, E. and Gwinner, G. and Heggen, H. and Lassen, J. and Orozco, L. A. and Pearson, M. R. and Raeder, S. and Teigelhoefer, A.} } @article { ISI:000332224400046, title = {Optical detection of radio waves through a nanomechanical transducer}, journal = {NATURE}, volume = {507}, number = {7490}, year = {2014}, month = {MAR 6}, pages = {81-85}, issn = {0028-0836}, doi = {10.1038/nature13029}, author = {Bagci, T. and Simonsen, A. and Schmid, S. and Villanueva, L. G. and Zeuthen, E. and J. Appel and Taylor, J. M. and Sorensen, A. and Usami, K. and Schliesser, A. and Polzik, E. S.} } @article { ISI:000339096600019, title = {Photon Emission from a Cavity-Coupled Double Quantum Dot}, journal = {PHYSICAL REVIEW LETTERS}, volume = {113}, number = {3}, year = {2014}, month = {JUL 16}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.113.036801}, author = {Liu, Y. -Y. and Petersson, K. D. and Stehlik, J. and Taylor, J. M. and Petta, J. R.} } @article { ISI:000345247900007, title = {Quantum multicriticality in bilayer graphene with a tunable energy gap}, journal = {PHYSICAL REVIEW B}, volume = {90}, number = {20}, year = {2014}, month = {NOV 7}, issn = {1098-0121}, doi = {10.1103/PhysRevB.90.205407}, author = {Throckmorton, Robert E. and S. Das Sarma} } @article { ISI:000342107800001, title = {Resistive anisotropy due to spin-fluctuation scattering in the nematic phase of iron pnictides}, journal = {PHYSICAL REVIEW B}, volume = {90}, number = {12}, year = {2014}, month = {SEP 10}, issn = {1098-0121}, doi = {10.1103/PhysRevB.90.121104}, author = {Breitkreiz, Maxim and Brydon, P. M. R. and Timm, Carsten} } @article { ISI:000341295100009, title = {Signatures of localization in the effective metallic regime of high-mobility Si MOSFETs}, journal = {PHYSICAL REVIEW B}, volume = {90}, number = {12}, year = {2014}, month = {SEP 8}, issn = {1098-0121}, doi = {10.1103/PhysRevB.90.125410}, author = {S. Das Sarma and Hwang, E. H. and Kechedzhi, K. and Tracy, L. A.} } @article { ISI:000331645900098, title = {Single-layer graphene on silicon nitride micromembrane resonators}, journal = {JOURNAL OF APPLIED PHYSICS}, volume = {115}, number = {5}, year = {2014}, month = {FEB 7}, issn = {0021-8979}, doi = {10.1063/1.4862296}, author = {Silvan Schmid and Tolga Bagci and Emil Zeuthen and Jacob M Taylor and Herring, Patrick K. and Cassidy, Maja C. and Charles M Marcus and Luis Guillermo Villanueva and Amato, Bartolo and Boisen, Anja and Shin, Yong Cheol and Kong, Jing and Anders S Sorensen and Koji Usami and Eugene S Polzik} } @article { ISI:000335912400002, title = {Single-photon transistor based on superconducting systems}, journal = {PHYSICAL REVIEW B}, volume = {89}, number = {18}, year = {2014}, month = {MAY 12}, issn = {1098-0121}, doi = {10.1103/PhysRevB.89.180502}, author = {Manzoni, Marco T. and Reiter, Florentin and Taylor, Jacob M. and Sorensen, Anders S.} } @article { ISI:000345243400008, title = {Spin-orbit-coupled topological Fulde-Ferrell states of fermions in a harmonic trap}, journal = {PHYSICAL REVIEW A}, volume = {90}, number = {5}, year = {2014}, month = {NOV 7}, issn = {1050-2947}, doi = {10.1103/PhysRevA.90.053606}, author = {Jiang, Lei and Tiesinga, Eite and Liu, Xia-Ji and Hu, Hui and Pu, Han} } @article { ISI:000343736900020, title = {Squeezing in a coupled two-mode optomechanical system for force sensing below the standard quantum limit}, journal = {PHYSICAL REVIEW A}, volume = {90}, number = {4}, year = {2014}, month = {OCT 21}, issn = {1050-2947}, doi = {10.1103/PhysRevA.90.043848}, author = {Xu, Xunnong and Taylor, Jacob M.} } @article { ISI:000332415200006, title = {Superconducting pairing in the spin-density-wave phase of iron pnictides}, journal = {PHYSICAL REVIEW B}, volume = {89}, number = {5}, year = {2014}, month = {FEB 26}, issn = {1098-0121}, doi = {10.1103/PhysRevB.89.054515}, author = {Schmiedt, Jacob and Brydon, P. M. R. and Timm, Carsten} } @article { ISI:000341446300023, title = {Topological physics with light}, journal = {PHYSICS TODAY}, volume = {67}, number = {5}, year = {2014}, month = {MAY}, pages = {68-69}, issn = {0031-9228}, doi = {10.1063/PT.3.2394}, author = {Hafezi, Mohammad and Taylor, Jacob M.} } @article {2622, title = {Topologically Robust Transport of Photons in a Synthetic Gauge Field}, journal = {Phys. Rev. Lett.}, volume = {113}, year = {2014}, month = {Aug}, pages = {087403}, doi = {10.1103/PhysRevLett.113.087403}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.113.087403}, author = {Mittal, S. and J. Fan and Faez, S. and Migdall, A. and Taylor, J. M. and M. Hafezi} } @article { ISI:000342234700001, title = {Transport in multiband systems with hot spots on the Fermi surface: Forward-scattering corrections}, journal = {PHYSICAL REVIEW B}, volume = {89}, number = {24}, year = {2014}, month = {JUN 6}, issn = {1098-0121}, doi = {10.1103/PhysRevB.89.245106}, author = {Breitkreiz, Maxim and Brydon, P. M. R. and Timm, Carsten} } @article { ISI:000340615500034, title = {Trapping atoms using nanoscale quantum vacuum forces}, journal = {NATURE COMMUNICATIONS}, volume = {5}, year = {2014}, month = {JUL}, issn = {2041-1723}, doi = {10.1038/ncomms5343}, author = {Chang, D. E. and Sinha, K. and Taylor, J. M. and Kimble, H. J.} } @article { ISI:000332518100093, title = {Ultra-sensitive chip-based photonic temperature sensor using ring resonator structures}, journal = {OPTICS EXPRESS}, volume = {22}, number = {3}, year = {2014}, month = {FEB 10}, pages = {3098-3104}, issn = {1094-4087}, doi = {10.1364/OE.22.003098}, author = {Xu, Haitan and Mohammad Hafezi and Jingyun Fan and Jacob M Taylor and G F Strouse and Ahmed, Zeeshan} } @article {2685, title = {Universal and nonuniversal effective N-body interactions for ultracold harmonically trapped few-atom systems}, journal = {Phys. Rev. A}, volume = {90}, year = {2014}, month = {Oct}, pages = {043631}, doi = {10.1103/PhysRevA.90.043631}, url = {http://link.aps.org/doi/10.1103/PhysRevA.90.043631}, author = {Yin, X. Y. and Blume, D. and Johnson, P. R. and E. Tiesinga} } @article { ISI:000344914500023, title = {Which resonances in small metallic nanoparticles are plasmonic?}, journal = {JOURNAL OF OPTICS}, volume = {16}, number = {11}, year = {2014}, month = {NOV}, issn = {2040-8978}, doi = {10.1088/2040-8978/16/11/114022}, author = {Townsend, Emily and Bryant, Garnett W.} } @inbook { ISI:000325758700024, title = {Architectures}, booktitle = {QUANTUM ERROR CORRECTION}, year = {2013}, pages = {537-552}, isbn = {978-0-521-89787-7}, author = {Taylor, Jacob}, editor = {Lidar, DA and Brun, TA} } @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.} } @article {ISI:000318808600006, title = {Controlling the group velocity of colliding atomic Bose-Einstein condensates with Feshbach resonances}, journal = {Phys. Rev. A}, volume = {87}, number = {5}, year = {2013}, month = {may}, pages = {053608}, issn = {1050-2947}, doi = {10.1103/PhysRevA.87.053608}, author = {Mathew, Ranchu and Eite Tiesinga} } @article {2094, title = {Dynamics of spin-1 bosons in an optical lattice: Spin mixing, quantum-phase-revival spectroscopy, and effective three-body interactions}, journal = {Phys. Rev. A}, volume = {88}, year = {2013}, month = {Aug}, pages = {023602}, doi = {10.1103/PhysRevA.88.023602}, url = {http://link.aps.org/doi/10.1103/PhysRevA.88.023602}, author = {K W Mahmud and Eite Tiesinga} } @conference { ISI:000355262503349, title = {Efficient, low-noise, single-photon frequency conversion}, 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 = {Kuo, Paulina S. and Pelc, Jason S. and Slattery, Oliver and Kim, Yong-Su and Fejer, M. M. and Tang, Xiao} } @article {1943, title = {Electrically Protected Resonant Exchange Qubits in Triple Quantum Dots}, journal = {Phys. Rev. Lett.}, volume = {111}, year = {2013}, month = {Jul}, pages = {050502}, doi = {10.1103/PhysRevLett.111.050502}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.111.050502}, author = {Jacob M Taylor and V Srinivasa and J Medford} } @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} } @article { ISI:000324234700005, title = {Formation and decay of Bose-Einstein condensates in an excited band of a double-well optical lattice}, journal = {Phys. Rev. A}, volume = {88}, number = {3}, year = {2013}, month = {SEP 12}, pages = {033615}, issn = {1050-2947}, doi = {10.1103/PhysRevA.88.033615}, author = {Paul, Saurabh and Eite Tiesinga} } @article { ISI:000327145900007, title = {Hyperfine and vibrational structure of weakly bound levels of the lowest 1(g) state of molecular Rb-87(2)}, journal = {PHYSICAL REVIEW A}, volume = {88}, number = {5}, year = {2013}, month = {NOV 13}, issn = {1050-2947}, doi = {10.1103/PhysRevA.88.052509}, author = {Tsai, Chin-Chun and Bergeman, T. and E. Tiesinga and Julienne, P. S. and Heinzen, D. J.} } @article {2117, title = {Imaging topological edge states in Silicon photonics}, journal = {Nat. Photon.}, volume = {7}, year = {2013}, month = {10/2013}, pages = {1001}, doi = {10.1038/nphoton.2013.274}, author = {Mohammad Hafezi and S Mittal and Jingyun Fan and Alan L Migdall and Jacob M Taylor} } @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.} } @article { ISI:000324827200059, title = {Linear and nonlinear coupling between transverse modes of a nanomechanical resonator}, journal = {JOURNAL OF APPLIED PHYSICS}, volume = {114}, number = {11}, year = {2013}, month = {SEP 21}, issn = {0021-8979}, doi = {10.1063/1.4821273}, author = {Truitt, P. A. and Hertzberg, J. B. and Altunkaya, E. and Schwab, K. C.} } @article {ISI:000319807500001, title = {Non-equilibrium fractional quantum Hall state of light}, journal = {New J. Phys.}, volume = {15}, year = {2013}, month = {jun}, pages = {063001}, issn = {1367-2630}, doi = {10.1088/1367-2630/15/6/063001}, author = {Mohammad Hafezi and Mikhail D Lukin and Jacob M Taylor} } @article {PhysRevLett.110.060503, title = {Nonlinear Optics Quantum Computing with Circuit QED}, journal = {Phys. Rev. Lett.}, volume = {110}, year = {2013}, month = {Feb}, pages = {060503}, publisher = {American Physical Society}, keywords = {Single Fellow}, doi = {10.1103/PhysRevLett.110.060503}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.110.060503}, author = {Adhikari, Prabin and Mohammad Hafezi and Jacob M Taylor} } @article { ISI:000329437000003, title = {Observation of Autler-Townes effect in a dispersively dressed Jaynes-Cummings system}, journal = {NEW JOURNAL OF PHYSICS}, volume = {15}, year = {2013}, month = {DEC 5}, issn = {1367-2630}, doi = {10.1088/1367-2630/15/12/125007}, author = {B Suri and Z K Keane and Ruskov, R. and Bishop, Lev S. and Tahan, C. and S Novikov and J E Robinson and F C Wellstood and B S Palmer} } @conference { ISI:000355316300624, title = {Optical Readout of Coupling Between a Nanomembrane and an LC Circuit at Room Temperature}, 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 = {Bagci, T. and Simonsen, A. and Zeuthen, E. and Taylor, J. M. and Villanueva, L. G. and Schmid, S. and Sorensen, A. and Schliesser, A. and Usami, K. and Polzik, E. S.} } @conference { ISI:000355262502116, title = {Photonic temperature sensor based on microring resonators}, 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 = {Xu, H. and M. Hafezi and J. Fan and Migdall, A. and Strouse, G. and Ahmed, Z. and Taylor, J. M.} } @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:000313938900013, title = {Quadrature interferometry for nonequilibrium ultracold atoms in optical lattices}, journal = {Phys. Rev. A}, volume = {87}, number = {1}, year = {2013}, month = {jan}, pages = {013423}, abstract = {We develop an interferometric technique for making time-resolved measurements of field-quadrature operators for nonequilibrium ultracold bosons in optical lattices. The technique exploits the internal state structure of magnetic atoms to create two subsystems of atoms in different spin states and lattice sites. A Feshbach resonance turns off atom-atom interactions in one spin subsystem, making it a well-characterized reference state, while atoms in the other subsystem undergo nonequilibrium dynamics for a variable hold time. Interfering the subsystems via a second beam-splitting operation, time-resolved quadrature measurements on the interacting atoms are obtained by detecting relative spin populations. The technique can provide quadrature measurements for a variety of Hamiltonians and lattice geometries (e. g., cubic, honeycomb, superlattices), including systems with tunneling, spin-orbit couplings using artificial gauge fields, and higher-band effects. Analyzing the special case of a deep lattice with negligible tunneling, we obtain the time evolution of both quadrature observables and their fluctuations. As a second application, we show that the interferometer can be used to measure atom-atom interaction strengths with super-Heisenberg scaling (n) over bar (-3/2) in the mean number of atoms per lattice site, and standard quantum limit scaling M-1/2 in the number of lattice sites. In our analysis, we require M \>\> 1 and for realistic systems (n) over bar is small, and therefore the scaling in total atom number N = (n) over barM is below the Heisenberg limit; nevertheless, measurements testing the scaling behaviors for interaction-based quantum metrologies should be possible in this system. DOI: 10.1103/PhysRevA.87.013423

}, issn = {1050-2947}, doi = {10.1103/PhysRevA.87.013423}, author = {Eite Tiesinga and Philip R Johnson} } @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:000317580200043, title = {Reducing noise in single-photon-level frequency conversion}, journal = {OPTICS LETTERS}, volume = {38}, number = {8}, year = {2013}, month = {APR 15}, pages = {1310-1312}, issn = {0146-9592}, doi = {10.1364/OL.38.001310}, author = {Kuo, Paulina S. and Pelc, Jason S. and Slattery, Oliver and Kim, Yong-Su and Fejer, M. M. and Tang, Xiao} } @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 { 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 {1922, title = {Simultaneous Spin-Charge Relaxation in Double Quantum Dots}, journal = {Phys. Rev. Lett.}, volume = {110}, year = {2013}, month = {05/2013}, pages = {196803}, chapter = {196803}, keywords = {Quantum Dots, Spin-orbit coupling}, doi = {10.1103/PhysRevLett.110.196803}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.110.196803}, author = {V Srinivasa and K C Nowack and M Shafiei and L M K Vandersypen and Jacob M Taylor} } @article {ISI:000319015600009, title = {Soft Superconducting Gap in Semiconductor Majorana Nanowires}, journal = {Phys. Rev. Lett.}, volume = {110}, number = {18}, year = {2013}, month = {apr}, pages = {186803}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.110.186803}, author = {Takei, So and Benjamin M Fregoso and Hui, Hoi-Yin and Alejandro M Lobos and S. Das Sarma} } @article { ISI:000315727300006, title = {Soliton dynamics of an atomic spinor condensate on a ring lattice}, journal = {Phys. Rev. A}, volume = {87}, number = {3}, year = {2013}, month = {MAR 6}, issn = {1050-2947}, doi = {10.1103/PhysRevA.87.033608}, author = {Indubala Satija and Pando L, Carlos L. and Eite Tiesinga} } @article { ISI:000325547200076, title = {Spectral response of an upconversion detector and spectrometer}, journal = {OPTICS EXPRESS}, volume = {21}, number = {19}, year = {2013}, month = {SEP 23}, pages = {22523-22531}, issn = {1094-4087}, doi = {10.1364/OE.21.022523}, author = {Kuo, Paulina S. and Slattery, Oliver and Kim, Yong-Su and Pelc, Jason S. and Fejer, M. M. and Tang, Xiao} } @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} } @conference { ISI:000355262503346, title = {Time-dependent multiphoton emission from a quantum dot.}, 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 = {Polyakov, Sergey V. and Flagg, Edward B. and Thomay, Tim and Solomon, Glenn S.} } @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:000313029200002, title = {Ultracold mixtures of atomic Li-6 and Cs-133 with tunable interactions}, journal = {Phys. Rev. A}, volume = {87}, number = {1}, year = {2013}, month = {JAN 3}, issn = {1050-2947}, doi = {10.1103/PhysRevA.87.010702}, author = {Tung, Shih-Kuang and Parker, Colin and Johansen, Jacob and Chin, Cheng and Wang, Yujun and Paul S Julienne} } @article { ISI:000317193400004, title = {Unconventional spin-density waves in dipolar Fermi gases}, journal = {Phys. Rev. A}, volume = {87}, number = {4}, year = {2013}, month = {APR 5}, pages = {043604}, issn = {1050-2947}, doi = {10.1103/PhysRevA.87.043604}, author = {S G Bhongale and Ludwig Mathey and Tsai, Shan-Wen and Charles W Clark and Zhao, Erhai} } @article { ISI:000308458900005, title = {Anisotropy-Induced Feshbach Resonances in a Quantum Dipolar Gas of Highly Magnetic Atoms}, journal = {PHYSICAL REVIEW LETTERS}, volume = {109}, number = {10}, year = {2012}, month = {SEP 7}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.109.103002}, author = {Petrov, Alexander and Tiesinga, Eite and Svetlana Kotochigova} } @article {Hafezi2012, title = {Atomic interface between microwave and optical photons}, journal = {Phys. Rev. A}, volume = {85}, number = {2}, year = {2012}, month = {feb}, pages = {020302}, keywords = {CMAMO non fellow, Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v85/i2/e020302}, author = {Mohammad Hafezi and Kim, Z. and Steven L Rolston and Luis A Orozco and Lev, B. L. and Jacob M Taylor} } @article {ISI:000302238900006, title = {Bond Order Solid of Two-Dimensional Dipolar Fermions}, journal = {Phys. Rev. Lett.}, volume = {108}, number = {14}, year = {2012}, pages = {145301}, abstract = {The recent experimental realization of dipolar Fermi gases near or below quantum degeneracy provides an opportunity to engineer Hubbard-like models with long-range interactions. Motivated by these experiments, we chart out the theoretical phase diagram of interacting dipolar fermions on the square lattice at zero temperature and half filling. We show that, in addition to p-wave superfluid and charge density wave order, two new and exotic types of bond order emerge generically in dipolar fermion systems. These phases feature homogeneous density but periodic modulations of the kinetic hopping energy between nearest or next-nearest neighbors. Similar, but manifestly different, phases of two-dimensional correlated electrons have previously only been hypothesized and termed {\textquoteleft}{\textquoteleft}density waves of nonzero angular momentum.{\textquoteright}{\textquoteright} Our results suggest that these phases can be constructed flexibly with dipolar fermions, using currently available experimental techniques.

}, keywords = {2012, Single Fellow}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.108.145301}, author = {S G Bhongale and Ludwig Mathey and Tsai, Shan-Wen and Charles W Clark and Zhao, Erhai} } @article {2410, title = {Circuit Quantum Electrodynamics with a Spin Qubit}, journal = {Nature}, volume = {490}, year = {2012}, month = {10/2012}, pages = {380-383}, doi = {10.1038/nature11559}, author = {K. D. Petersson and L. W. McFaul and M D Schroer and M. Jung and Jacob M Taylor and A. A. Houck and J. R. Petta} } @article { ISI:000307873600058, title = {Dual-channel, single-photon upconversion detector at 1.3 mu m}, journal = {OPTICS EXPRESS}, volume = {20}, number = {17}, year = {2012}, month = {AUG 13}, pages = {19075-19087}, issn = {1094-4087}, doi = {10.1364/OE.20.019075}, author = {Pelc, J. S. and Kuo, Paulina S. and Slattery, Oliver and Ma, Lijun and Tang, Xiao and Fejer, M. M.} } @article {2541, title = {Dynamics of Nonclassical Light from a Single Solid-State Quantum Emitter}, journal = {PHYSICAL REVIEW LETTERS}, volume = {109}, year = {2012}, month = {OCT 18}, pages = {163601}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.109.163601}, author = {Flagg, Edward B. and Polyakov, Sergey V. and Thomay, Tim and Solomon, Glenn S.} } @article {2533, title = {Effective renormalized multi-body interactions of harmonically confined ultracold neutral bosons}, journal = {NEW JOURNAL OF PHYSICS}, volume = {14}, year = {2012}, month = {MAY 25}, pages = {053037}, issn = {{1367-2630}}, doi = {10.1088/1367-2630/14/5/053037}, author = {Johnson, P. R. and Blume, D. and Yin, X. Y. and Flynn, W. F. and E. Tiesinga} } @article {2456, title = {Electronic Detection of Collective Modes of an Ultracold Plasma}, journal = {Phys. Rev. Lett.}, volume = {108}, year = {2012}, month = {2/2012}, pages = {065003}, doi = {10.1103/PhysRevLett.108.065003}, author = {Twedt, K A and Steven L Rolston} } @article {ISI:000312837600004, title = {Equilibrium states of open quantum systems in the strong coupling regime}, journal = {Phys. Rev. E}, volume = {86}, number = {6, 1}, year = {2012}, month = {dec}, pages = {061132}, abstract = {In this work we investigate the late-time steady states of open quantum systems coupled to a thermal reservoir in the strong coupling regime. In general such systems do not necessarily relax to a Boltzmann distribution if the coupling to the thermal reservoir is nonvanishing or equivalently if the relaxation time scales are finite. Using a variety of nonequilibrium formalisms valid for non-Markovian processes, we show that starting from a product state of the closed system = system + environment, with the environment in its thermal state, the open system which results from coarse graining the environment will evolve towards an equilibrium state at late times. This state can be expressed as the reduced state of the closed system thermal state at the temperature of the environment. For a linear (harmonic) system and environment, which is exactly solvable, we are able to show in a rigorous way that all multitime correlations of the open system evolve towards those of the closed system thermal state. Multitime correlations are especially relevant in the non-Markovian regime, since they cannot be generated by the dynamics of the single-time correlations. For more general systems, which cannot be exactly solved, we are able to provide a general proof that all single-time correlations of the open system evolve to those of the closed system thermal state, to first order in the relaxation rates. For the special case of a zero-temperature reservoir, we are able to explicitly construct the reduced closed system thermal state in terms of the environmental correlations. DOI:10.1103/PhysRevE.86.061132

}, issn = {1539-3755}, doi = {10.1103/PhysRevE.86.061132}, author = {Y Subasi and C H Fleming and Jacob M Taylor and Bei-Lok Hu} } @article {Sau2012, title = {Experimental and materials considerations for the topological superconducting state in electron- and hole-doped semiconductors: Searching for non-Abelian Majorana modes in 1D nanowires and 2D heterostructures}, journal = {Phys. Rev. B}, volume = {85}, number = {6}, year = {2012}, month = {feb}, pages = {064512}, keywords = {Single Fellow}, issn = {1098-0121}, doi = {10.1103/PhysRevB.85.064512}, url = {http://prb.aps.org/abstract/PRB/v85/i6/e064512}, author = {Jay D Sau and Tewari, Sumanta and S. Das Sarma} } @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 { 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 {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 {Solomon2012, title = {Manipulating single photons from disparate quantum sources to be indistinguishable [Invited]}, journal = {JOSA B}, volume = {29}, number = {3}, year = {2012}, month = {feb}, pages = {319}, publisher = {OSA}, abstract = {Quantum information networks will likely require different quantum systems for different functionality within the network. Indistinguishable photons can be used to interconnect these different subsystems. We discuss methods for coherently manipulating the single photons from different quantum systems and experimentally demonstrate spatial, temporal, and frequency matching of single photons using quantum dot and heralded parametric downconversion single photons. The bosonic nature of light insures that when two indistinguishable photons are superimposed on a beam splitter, they will form a single two-photon state, a process we call coalescence. This coalescence property can be used as both a fundamental test of indistinguishability and in quantum networks{\textemdash}connecting and propagating quantum information.

}, keywords = {-wire and -dot devices, Micro-optical devices, Nonlinear optical devices, Photon statistics, Quantum communications, Quantum-well, Resonators, Single Fellow}, issn = {0740-3224}, url = {http://josab.osa.org/abstract.cfm?URI=josab-29-3-319}, author = {Glenn S Solomon and Flagg, Edward B. and Sergey V Polyakov and Thomay, Tim and Andreas Muller} } @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 {Tewari2012, title = {Probing a topological quantum critical point in semiconductor-superconductor heterostructures}, journal = {Phys. Rev. B}, volume = {85}, number = {15}, year = {2012}, month = {apr}, pages = {155302}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v85/i15/e155302}, author = {Tewari, Sumanta and Jay D Sau and V W Scarola and Zhang, Chuanwei and S. Das Sarma} } @inbook { ISI:000301676500003, title = {Projected Wavefunctions and High T-c Superconductivity in Doped Mott Insulators}, booktitle = {STRONGLY CORRELATED SYSTEMS: THEORETICAL METHODS}, series = {Springer Series in Solid-State Sciences}, volume = {171}, year = {2012}, pages = {29-64}, isbn = {978-3-642-21831-6}, issn = {0171-1873}, doi = {10.1007/978-3-642-21831-6\_2}, author = {Randeria, Mohit and Sensarma, Rajdeep and Trivedi, Nandini}, editor = {Avella, A and Mancini, F} } @article {2454, title = {Quantum Interface between an Electrical Circuit and a Single Atom}, journal = {Phys. Rev. Lett.}, volume = {108}, year = {2012}, month = {3/2012}, pages = {130504}, doi = {10.1103/PhysRevLett.108.130504}, author = {D, Kielpinski and D. Kafri and M. J. Woolley and G. J. Milburn and Jacob M Taylor} } @article { ISI:000308464100017, title = {Simulating Capacitances to Silicon Quantum Dots: Breakdown of the Parallel Plate Capacitor Model}, journal = {IEEE TRANSACTIONS ON NANOTECHNOLOGY}, volume = {11}, number = {5}, year = {2012}, month = {SEP}, pages = {975-978}, issn = {1536-125X}, doi = {10.1109/TNANO.2012.2206826}, author = {Thorbeck, Ted and Fujiwara, Akira and Zimmerman, Neil M.} } @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 {PhysRevLett.109.266402, title = {To Close or Not to Close: The Fate of the Superconducting Gap Across the Topological Quantum Phase Transition in Majorana-Carrying Semiconductor Nanowires}, journal = {Phys. Rev. Lett.}, volume = {109}, year = {2012}, month = {Dec}, pages = {266402}, publisher = {American Physical Society}, doi = {10.1103/PhysRevLett.109.266402}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.109.266402}, author = {Tudor D Stanescu and Tewari, Sumanta and Jay D Sau and S. Das Sarma} } @article {2538, title = {Topological minigap in quasi-one-dimensional spin-orbit-coupled semiconductor Majorana wires}, journal = {PHYSICAL REVIEW B}, volume = {86}, year = {2012}, month = {JUL 5}, pages = {024504}, issn = {1098-0121}, doi = {10.1103/PhysRevB.86.024504}, author = {Tewari, Sumanta and Stanescu, T. D. and Sau, Jay D. and S. Das Sarma} } @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 {Sau2011b, title = {Controlling non-Abelian statistics of Majorana fermions in semiconductor nanowires}, journal = {Phys. Rev. B}, volume = {84}, number = {9}, year = {2011}, month = {sep}, pages = {094505}, keywords = {2011, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v84/i9/e094505}, author = {Jay D Sau and Clarke, David and Tewari, Sumanta} } @article { ISI:000291652300006, title = {Diagrammatic quantum Monte Carlo solution of the two-dimensional cooperon-fermion model}, journal = {PHYSICAL REVIEW B}, volume = {83}, number = {21}, year = {2011}, month = {JUN 15}, issn = {1098-0121}, doi = {10.1103/PhysRevB.83.214516}, author = {Yang, Kai-Yu and Kozik, E. and Wang, Xin and Troyer, M.} } @article {Sau2011a, title = {Diamagnetic Susceptibility Obtained from the Six-Vertex Model and Its Implications for the High-Temperature Diamagnetic State of Cuprate Superconductors}, journal = {Phys. Rev. Lett.}, volume = {107}, number = {17}, year = {2011}, month = {oct}, pages = {177006}, keywords = {2011, No Fellows}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v107/i17/e177006}, author = {Jay D Sau and Tewari, Sumanta} } @article {Baltrusch2011, title = {Fast and robust quantum computation with ionic Wigner crystals}, journal = {Phys. Rev. A}, volume = {83}, number = {4}, year = {2011}, month = {apr}, pages = {042319}, keywords = {2011}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v83/i4/e042319}, author = {Baltrusch, J. and Negretti, A. and Jacob M Taylor and Tommaso Calarco} } @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 {2394, title = {Laser Cooling and Optical Detection of Excitations in a LC Electrical Circuit}, journal = {Physical Review Letters}, volume = {107}, year = {2011}, month = {12/2011}, url = {http://link.aps.org/doi/10.1103/PhysRevLett.107.273601}, author = {Jacob M Taylor and Anders S Sorensen and Charles M Marcus and Eugene S Polzik} } @article { ISI:000294773500007, title = {Majorana edge states in interacting two-chain ladders of fermions}, journal = {PHYSICAL REVIEW B}, volume = {84}, number = {9}, year = {2011}, month = {SEP 12}, issn = {1098-0121}, doi = {10.1103/PhysRevB.84.094503}, author = {Cheng, Meng and Tu, Hong-Hao} } @article { ISI:000293128900003, title = {Majorana fermion exchange in quasi-one-dimensional networks}, journal = {PHYSICAL REVIEW B}, volume = {84}, number = {3}, year = {2011}, month = {JUL 25}, issn = {1098-0121}, doi = {10.1103/PhysRevB.84.035120}, author = {Clarke, David J. and Sau, Jay D. and Tewari, Sumanta} } @article {Clarke2011, title = {Majorana fermion exchange in quasi-one-dimensional networks}, journal = {Phys. Rev. B}, volume = {84}, number = {3}, year = {2011}, month = {jul}, pages = {035120}, keywords = {2011, No Fellows}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v84/i3/e035120}, author = {Clarke, David and Jay D Sau and Tewari, Sumanta} } @article {Blatt2011, title = {Measurement of Optical Feshbach Resonances in an Ideal Gas}, journal = {Phys. Rev. Lett.}, volume = {107}, number = {7}, year = {2011}, month = {aug}, pages = {073202}, keywords = {2011}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v107/i7/e073202}, author = {Blatt, S and T L Nicholson and Bloom, B. and James E Williams and J W Thomsen and Paul S Julienne and Jun Ye} } @article { ISI:000298560100002, title = {Neutral mode heat transport and fractional quantum Hall shot noise}, journal = {PHYSICAL REVIEW B}, volume = {84}, number = {23}, year = {2011}, month = {DEC 28}, issn = {1098-0121}, doi = {10.1103/PhysRevB.84.235316}, author = {Takei, So and Rosenow, Bernd} } @article {Borkowski2011, title = {Photoassociative production of ultracold heteronuclear ytterbium molecules}, journal = {Phys. Rev. A}, volume = {84}, number = {3}, year = {2011}, month = {sep}, pages = {30702}, keywords = {2011, Coherent control of atomic interactions with photo, General theories and models of atomic and molecula, Interatomic potentials and forces, Laser-modified scattering and reactions}, issn = {1050-2947}, url = {http://adsabs.harvard.edu/abs/2011PhRvA..84c0702B}, author = {Mateusz Borkowski and Roman Ciurylo and Paul S Julienne and Yamazaki, Rekishu and Hara, Hideaki and Katsunari Enomoto and Taie, Shintaro and Seiji Sugawa and Takasu, Yosuke and Yoshiro Takahashi} } @article {Sau2011d, title = {Probing non-Abelian statistics with Majorana fermion interferometry in spin-orbit-coupled semiconductors}, journal = {Phys. Rev. B}, volume = {84}, number = {8}, year = {2011}, month = {aug}, pages = {085109}, keywords = {2011, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v84/i8/e085109}, author = {Jay D Sau and Tewari, Sumanta and S. Das Sarma} } @article {2458, title = {Robust optical delay lines via topological protection}, journal = {Nature Physics}, volume = {7}, year = {2011}, pages = {907-912}, doi = {10.1038/NPHYS2063}, author = {Mohammad Hafezi and Demler, E. and Mikhail D Lukin and Jacob M Taylor} } @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 {Braun2011, title = {Superradiance of cold atoms coupled to a superconducting circuit}, journal = {Phys. Rev. A}, volume = {83}, number = {6}, year = {2011}, month = {jun}, pages = {062305}, keywords = {2011}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v83/i6/e062305}, author = {Braun, Daniel and Jonathan E Hoffman 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 {Tewari2011, title = {Topologically non-trivial superconductivity in spin{\textendash}orbit-coupled systems: bulk phases and quantum phase transitions}, journal = {New J. Phys.}, volume = {13}, number = {6}, year = {2011}, month = {jun}, pages = {065004}, abstract = {Topologically non-trivial superconductivity has been predicted to occur in superconductors with a sizable spin-orbit coupling in the presence of an external Zeeman splitting. Two such systems have been proposed: (a) s-wave superconductor pair potential is proximity induced on a semiconductor, and (b) pair potential naturally arises from an intrinsic s-wave pairing interaction. As is now well known, such systems in the form of a 2D film or 1D nano-wires in a wire-network can be used for topological quantum computation. When the external Zeeman splitting \$\backslash Gamma\$ crosses a critical value \$\backslash Gamma\_c\$, the system passes from a regular superconducting phase to a non-Abelian topological superconducting phase. In both cases (a) and (b) we consider in this paper the pair potential \$\backslash Delta\$ is strictly s-wave in both the ordinary and the topological superconducting phases, which are separated by a topological quantum critical point at \$\backslash Gamma\_c = \backslash sqrt\{\backslash Delta\^{}2 + \backslash mu\^{}2\}\$, where \$\backslash mu (\>\> \backslash Delta)\$ is the chemical potential. On the other hand, since \$\backslash Gamma\_c \>\> \backslash Delta\$, the Zeeman splitting required for the topological phase (\$\backslash Gamma \> \backslash Gamma\_c\$) far exceeds the value (\$\backslash Gamma \backslash sim \backslash Delta\$) above which an s-wave pair potential is expected to vanish (and the system to become non-superconducting) in the absence of spin-orbit coupling. We are thus led to a situation that the topological superconducting phase appears to set in a parameter regime at which the system actually is non-superconducting in the absence of spin-orbit coupling. In this paper we address the question of how a pure s-wave pair potential can survive a strong Zeeman field to give rise to a topological superconducting phase. We show that the spin-orbit coupling is the crucial parameter for the quantum transition into and the robustness of the topologically non-trivial superconducting phase realized for \$\backslash Gamma \>\> \backslash Delta\$.

}, keywords = {2011, Single Fellow}, issn = {1367-2630}, url = {http://stacks.iop.org/1367-2630/13/i=6/a=065004 http://arxiv.org/abs/1012.0057}, author = {Tewari, Sumanta and Tudor D Stanescu and Jay D Sau and S. Das Sarma} } @article {2551, title = {Unified approach to topological quantum computation with anyons: From qubit encoding to Toffoli gate}, journal = {PHYSICAL REVIEW A}, volume = {84}, year = {2011}, month = {JUL 26}, pages = {012332}, issn = {1050-2947}, doi = {10.1103/PhysRevA.84.012332}, author = {Xu, Haitan and Taylor, J. M.} } @article {Hanna2010, title = {Creation and manipulation of Feshbach resonances with radiofrequency radiation}, journal = {New J. Phys.}, volume = {12}, number = {8}, year = {2010}, month = {aug}, pages = {083031}, abstract = {We present a simple technique for studying collisions of ultracold atoms in the presence of a magnetic field and radio-frequency radiation (rf). Resonant control of scattering properties can be achieved by using rf to couple a colliding pair of atoms to a bound state. We show, using the example of 6Li, that in some ranges of rf frequency and magnetic field this can be done without giving rise to losses. We also show that halo molecules of large spatial extent require much less rf power than deeply bound states. Another way to exert resonant control is with a set of rf-coupled bound states, linked to the colliding pair through the molecular interactions that give rise to magnetically tunable Feshbach resonances. This was recently demonstrated for 87Rb [Kaufman et al., Phys. Rev. A 80:050701(R), 2009]. We examine the underlying atomic and molecular physics which made this possible. Lastly, we consider the control that may be exerted over atomic collisions by placing atoms in superpositions of Zeeman states, and suggest that it could be useful where small changes in scattering length are required. We suggest other species for which rf and magnetic field control could together provide a useful tuning mechanism.

}, keywords = {2010}, issn = {1367-2630}, doi = {10.1088/1367-2630/12/8/083031}, url = {http://arxiv.org/abs/1004.0636}, author = {Thomas M Hanna and Eite Tiesinga and Paul S Julienne} } @article {Twedt2010, title = {Electron evaporation from an ultracold plasma in a uniform electric field}, journal = {Phys. Plasmas}, volume = {17}, number = {8}, year = {2010}, month = {jun}, pages = {082101}, abstract = {Electrons in an expanding ultracold plasma are expected to be in quasi-equilibrium, since the collision times are short compared to the plasma lifetime, yet we observe electrons evaporating out as the ion density decreases during expansion. We observe that a small electric field that shifts the electron cloud with respect to the ions increases the evaporation rate. We have calculated the spatial distribution of a zero-temperature electron cloud as a function of applied field and ion density, which is assumed to be Gaussian at all times. This calculation allows us to predict the flux of cold electrons from the plasma at all times, and is in good agreement with our observed electron signal.

}, keywords = {2010}, issn = {1070664X}, doi = {10.1063/1.3466856}, url = {http://arxiv.org/abs/1006.0250}, author = {Twedt, K A and Steven L Rolston} } @article {Chin2010, title = {Feshbach resonances in ultracold gases}, journal = {Rev. Mod. Phys.}, volume = {82}, number = {2}, year = {2010}, month = {apr}, pages = {1225{\textendash}1286}, keywords = {2010}, issn = {0034-6861}, url = {http://rmp.aps.org/abstract/RMP/v82/i2/p1225_1}, author = {Chin, Cheng and Paul S Julienne and Eite Tiesinga} } @article {Sau2010b, title = {Generic New Platform for Topological Quantum Computation Using Semiconductor Heterostructures}, journal = {Phys. Rev. Lett.}, volume = {104}, number = {4}, year = {2010}, month = {jan}, pages = {040502}, keywords = {2010, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v104/i4/e040502}, author = {Jay D Sau and Roman M Lutchyn and Tewari, Sumanta and S. Das Sarma} } @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 {2418, title = {Non-Abelian quantum order in spin-orbit-coupled semiconductors: Search for topological Majorana particles in solid-state systems}, journal = {Phys. Rev. B}, volume = {82}, year = {2010}, month = {12/2010}, pages = {214509}, doi = {10.1103/PhysRevB.82.214509}, author = {Jay D Sau and Tewari, Sumanta and Roman M Lutchyn and Tudor D Stanescu and S. Das Sarma} } @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 { 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 {Capogrosso-Sansone2010, title = {Quantum Phases of Cold Polar Molecules in 2D Optical Lattices}, journal = {Phys. Rev. Lett.}, volume = {104}, number = {12}, year = {2010}, month = {mar}, keywords = {2010, No Fellows}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v104/i12/e125301}, author = {Capogrosso-Sansone, B. and Trefzger, C. and Maciej Lewenstein and Peter Zoller and Guido Pupillo} } @article {Sau2010, title = {Robustness of Majorana fermions in proximity-induced superconductors}, journal = {Phys. Rev. B}, volume = {82}, number = {9}, year = {2010}, month = {sep}, pages = {094522}, keywords = {2010, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v82/i9/e094522}, author = {Jay D Sau and Roman M Lutchyn and Tewari, Sumanta and S. Das Sarma} } @article {Bell2010, title = {A slow atom source using a collimated effusive oven and a single-layer variable pitch coil Zeeman slower}, journal = {Rev. Sci. Instrum.}, volume = {81}, number = {1}, year = {2010}, month = {jan}, pages = {013105}, abstract = {We describe a simple slow atom source for loading a rubidium magneto-optical trap. The source includes an effusive oven with a long heated collimation tube. Almost all components are standard vacuum parts. The heating elements and thermocouples are external to the vacuum, protecting them from the hostile hot alkali environment and allowing repair without breaking vacuum. The thermal source is followed by a Zeeman slower with a single-layer coil of variable winding pitch. The single-layer design is simple to construct and has low inductance which allows for rapid switching of the magnetic field. The coil pitch was determined by fitting the analytic form of the magnetic field for a variable winding pitch to the desired magnetic field profile required to slow atoms. The measured magnetic field for the constructed coil is in excellent agreement with the desired field. The source produces atoms at 35 m/s with a flux up to 2 x 10(10) cm(-2) s(-1) at 200 degrees C.}, keywords = {2010, magnetic fields, magnetic traps, magneto-optical effects, rubidium, thermocouples}, issn = {1089-7623}, url = {http://link.aip.org/link/?RSINAK/81/013105/1}, author = {Bell, S. C. and Junker, M. and Jasperse, M. and L D Turner and Y -J Lin and Ian B Spielman and Scholten, R. E.} } @article { ISI:000281658500003, title = {Subband engineering even-denominator quantum Hall states}, journal = {PHYSICAL REVIEW B}, volume = {82}, number = {12}, year = {2010}, month = {SEP 9}, issn = {2469-9950}, doi = {10.1103/PhysRevB.82.121304}, author = {Scarola, V. W. and May, C. and Peterson, M. R. and Troyer, M.} } @article {ISI:000273947200008, title = {A theorem for the existence of Majorana fermion modes in spin{\textendash}orbit-coupled semiconductors}, journal = {Annals of Physics}, volume = {325}, number = {1, Sp. Iss. SI}, year = {2010}, month = {jan}, pages = {219{\textendash}231}, abstract = {We prove an index theorem for the existence of Majorana zero modes in a semiconducting thin film with a sizable spin{\textendash}orbit coupling when it is adjacent to an s-wave superconductor. The theorem, which is analogous to the Jackiw{\textendash}Rebbi index theorem for the zero modes in mass domain walls in one-dimensional Dirac theory, applies to vortices with odd flux-quantum in a semiconducting film in which s-wave superconductivity and a Zeeman splitting are induced by proximity effect. The momentum space construction of the zero-mode solution presented here is complementary to the approximate real space solution of the Bogoliubov-de Gennes equations at a vortex core (Sau et al., arXiv:0907.2239 [17]), proving the existence of non-degenerate zero-energy Majorana excitations and the resultant non-Abelian topological order in the semiconductor heterostructure. With increasing magnitude of the proximity-induced pairing potential, the non-Abelian superconducting state makes a topological quantum phase transition to an ordinary s-wave superconducting state which no topological order.

}, keywords = {2010, majorana fermions, non-abelian statistics, semiconductor, superconductor, topological quantum computation}, issn = {0003-4916}, url = {http://dx.doi.org/10.1016/j.aop.2009.11.003}, author = {Tewari, Sumanta and Jay D Sau and S. Das Sarma} } @article {Sau2010a, title = {Universal quantum computation in a semiconductor quantum wire network}, journal = {Phys. Rev. A}, volume = {82}, number = {5}, year = {2010}, month = {nov}, keywords = {2010, Single Fellow}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v82/i5/e052322}, author = {Jay D Sau and Tewari, Sumanta and S. Das Sarma} } @article { ISI:000267699700131, title = {Berry-phase-mediated topological thermoelectric transport in gapped single and bilayer graphene}, journal = {PHYSICAL REVIEW B}, volume = {79}, number = {24}, year = {2009}, month = {JUN}, issn = {1098-0121}, doi = {10.1103/PhysRevB.79.245424}, author = {Zhang, Chuanwei and Tewari, Sumanta and S. Das Sarma} } @article {Mathey2009a, title = {Collisional cooling of ultracold-atom ensembles using Feshbach resonances}, journal = {Phys. Rev. A}, volume = {80}, number = {3}, year = {2009}, month = {sep}, keywords = {2009, Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v80/i3/e030702}, author = {Ludwig Mathey and Eite Tiesinga and Paul S Julienne and Charles W Clark} } @article {Hu2009, title = {Counterflow and paired superfluidity in one-dimensional Bose mixtures in optical lattices}, journal = {Phys. Rev. A}, volume = {80}, number = {2}, year = {2009}, month = {aug}, pages = {023619}, keywords = {2009, Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v80/i2/e023619}, author = {Hu, Anzi and Ludwig Mathey and Ippei Danshita and Eite Tiesinga and Carl J Williams and Charles W Clark} } @article {Johnson2009, title = {Effective three-body interactions of neutral bosons in optical lattices}, journal = {New J. Phys.}, volume = {11}, number = {9}, year = {2009}, month = {sep}, pages = {093022}, abstract = {We show that there are effective three- and higher-body interactions generated by the two-body collisions of atoms confined in the lowest vibrational states of a three-dimensional (3D) optical lattice. The collapse and revival dynamics of approximate coherent states loaded into a lattice are a particularly sensitive probe of these higher-body interactions; the visibility of interference fringes depend on both two-, three- and higher-body energy scales, and these produce an initial dephasing that can help explain the surprisingly rapid decay of revivals seen in experiments. If inhomogeneities in the lattice system are sufficiently reduced, longer timescale partial and nearly full revivals will be visible. Using Feshbach resonances or control of the lattice potential it is possible to tune the effective higher-body interactions and simulate effective field theories in optical lattices.}, keywords = {2009}, issn = {1367-2630}, url = {http://stacks.iop.org/1367-2630/11/i=9/a=093022}, author = {Philip R Johnson and Eite Tiesinga and J V Porto and Carl J Williams} } @article { ISI:000269638500068, title = {Effects of fermions on the superfluid-insulator phase diagram of the Bose-Hubbard model}, journal = {PHYSICAL REVIEW B}, volume = {80}, number = {5}, year = {2009}, month = {AUG}, issn = {1098-0121}, doi = {10.1103/PhysRevB.80.054511}, author = {Tewari, Sumanta and Lutchyn, Roman M. and S. Das Sarma} } @article { ISI:000267699500113, title = {Energy relaxation of hot Dirac fermions in graphene}, journal = {PHYSICAL REVIEW B}, volume = {79}, number = {23}, year = {2009}, month = {JUN}, issn = {1098-0121}, doi = {10.1103/PhysRevB.79.235406}, author = {Tse, Wang-Kong and S. Das Sarma} } @article { ISI:000263815400088, title = {Fluctuation-induced first-order transition in p-wave superconductors}, journal = {PHYSICAL REVIEW B}, volume = {79}, number = {5}, year = {2009}, month = {FEB}, issn = {1098-0121}, doi = {10.1103/PhysRevB.79.054514}, author = {Li, Qi and Belitz, D. and Toner, John} } @article {Borkowski2009, title = {Line shapes of optical Feshbach resonances near the intercombination transition of bosonic Ytterbium}, year = {2009}, month = {may}, abstract = {The properties of bosonic Ytterbium photoassociation spectra near the intercombination transition \$\^{}\{1\}S\_\{0\}\${\textendash}\$\^{}\{3\}P\_\{1\}\$ are studied theoretically at ultra low temperatures. We demonstrate how the shapes and intensities of rotational components of optical Feshbach resonances are affected by mass tuning of the scattering properties of the two colliding ground state atoms. Particular attention is given to the relationship between the magnitude of the scattering length and the occurrence of shape resonances in higher partial waves of the van der Waals system. We develop a mass scaled model of the excited state potential that represents the experimental data for different isotopes. The shape of the rotational photoassociation spectrum for various bosonic Yb isotopes can be qualitatively different.}, keywords = {2009}, url = {http://arxiv.org/abs/0905.0958}, author = {Mateusz Borkowski and Roman Ciurylo and Paul S Julienne and Tojo, S. and Katsunari Enomoto and Yoshiro Takahashi} } @article {Lutchyn2009, title = {Loss of superfluidity by fermions in the boson Hubbard model on an optical lattice}, journal = {Phys. Rev. A}, volume = {79}, number = {1}, year = {2009}, month = {jan}, keywords = {2009}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v79/i1/e011606}, author = {Roman M Lutchyn and Tewari, Sumanta and S. Das Sarma} } @article {Kotochigova2009, title = {Multi-channel modelling of the formation of vibrationally cold polar KRb molecules}, journal = {New J. Phys.}, volume = {11}, number = {5}, year = {2009}, month = {may}, pages = {055043}, abstract = {We describe the theoretical advances that influenced the experimental creation of vibrationally and translationally cold polar 40 K 87 Rb molecules~[1, 2]. Cold molecules were created from very-weakly bound molecules formed by magnetic field sweeps near a Feshbach resonance in collisions of ultra-cold 40 K and 87 Rb atoms. Our analysis include the multi-channel bound-state calculations of the hyperfine and Zeeman mixed X 1 $Σ$ + and a 3 $Σ$ + vibrational levels. We find excellent agreement with the hyperfine structure observed in experimental data. In addition, we studied the spin{\textendash}orbit mixing in the intermediate state of the Raman transition. This allowed us to investigate its effect on the vibrationally averaged transition dipole moment to the lowest rovibrational level of the X 1 $Σ$ + state. Finally, we obtained an estimate of the polarizability of the initial and final rovibrational states of the Raman transition near frequencies relevant for optical trapping of the molecules.}, keywords = {2009}, issn = {1367-2630}, url = {http://stacks.iop.org/1367-2630/11/i=5/a=055043}, author = {Svetlana Kotochigova and Eite Tiesinga and Paul S Julienne} } @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 { ISI:000267699500077, title = {Observation of percolation-induced two-dimensional metal-insulator transition in a Si MOSFET}, journal = {PHYSICAL REVIEW B}, volume = {79}, number = {23}, year = {2009}, month = {JUN}, issn = {1098-0121}, doi = {10.1103/PhysRevB.79.235307}, author = {Tracy, L. A. and Hwang, E. H. and Eng, K. and Ten Eyck, G. A. and Nordberg, E. P. and Childs, K. and Carroll, M. S. and Lilly, M. P. and S. Das Sarma} } @article {Terraciano2009, title = {Photon burst detection of single atoms in an optical cavity}, journal = {Nat. Phys.}, volume = {5}, number = {7}, year = {2009}, month = {may}, pages = {480{\textendash}484}, publisher = {Nature Publishing Group}, abstract = {Many protocols in atomic physics and quantum information hinge on the ability to detect the presence of neutral atoms1, 2, 3, 4. Up to now, two avenues have been favoured: the direct detection of spontaneously emitted photons using high-quality optics5, 6, 7, or the observation of changes in light transmission through cavity mirrors due to strong atom{\textendash}photon coupling8, 9, 10, 11. Here, we present an approach that combines these two methods by detecting an atom in a driven cavity mode through the collection of spontaneous emission and forward scattering into an undriven, orthogonally polarized cavity mode. Moderate atom{\textendash}cavity coupling enhances the signal, enabling the detection of multiple photons from the same atom. This real-time measurement can establish the presence of a single freely moving atom in less than 1~s with more than 99.7\% confidence, using coincidence measurements to decrease the rate of false detections.}, keywords = {2009}, issn = {1745-2473}, url = {http://dx.doi.org/10.1038/nphys1282}, author = {Terraciano, M. L. and R Olson Knell and Norris, D G and Jing, J. and Fern{\'a}ndez, A. and Luis A Orozco} } @article {Hanna2009, title = {Prediction of Feshbach resonances from three input parameters}, 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/e040701}, author = {Thomas M Hanna and Eite Tiesinga and Paul S Julienne} } @article {Campbell2009, title = {Probing interactions between ultracold fermions}, journal = {Science}, volume = {324}, number = {5925}, year = {2009}, month = {apr}, pages = {360{\textendash}3}, abstract = {At ultracold temperatures, the Pauli exclusion principle suppresses collisions between identical fermions. This has motivated the development of atomic clocks with fermionic isotopes. However, by probing an optical clock transition with thousands of lattice-confined, ultracold fermionic strontium atoms, we observed density-dependent collisional frequency shifts. These collision effects were measured systematically and are supported by a theoretical description attributing them to inhomogeneities in the probe excitation process that render the atoms distinguishable. This work also yields insights for zeroing the clock density shift.

}, keywords = {2009}, issn = {1095-9203}, url = {http://www.sciencemag.org/content/324/5925/360.abstract}, author = {Gretchen K Campbell and Boyd, M. M. and J W Thomsen and Martin, M J and Blatt, S and Swallows, M D and T L Nicholson and Fortier, T and Oates, C W and Diddams, S A and Lemke, N D and Pascal Naidon and Paul S Julienne and Jun Ye and Ludlow, A. D.} } @article {Huckans2009, title = {Quantum and Classical Dynamics of a BEC in a Large-Period Optical Lattice}, journal = {Physical Review A}, volume = {80}, year = {2009}, month = {jan}, pages = {043609}, abstract = {We experimentally investigate diffraction of a Rb-87 Bose-Einstein condensate from a 1D optical lattice. We use a range of lattice periods and timescales, including those beyond the Raman-Nath limit. We compare the results to quantum mechanical and classical simulations, with quantitative and qualitative agreement, respectively. The classical simulation predicts that the envelope of the time-evolving diffraction pattern is shaped by caustics: singularities in the phase space density of classical trajectories. This behavior becomes increasingly clear as the lattice period grows.

}, keywords = {2009}, url = {http://arxiv.org/abs/0901.1386}, author = {J H Huckans and Ian B Spielman and Tolra, B. Laburthe and William D Phillips and J V Porto} } @article {Liu2009a, title = {Quantum Phase Transitions and Continuous Observation of Spinor Dynamics in an Antiferromagnetic Condensate}, journal = {Phys. Rev. Lett.}, volume = {102}, number = {12}, year = {2009}, month = {mar}, pages = {125301}, keywords = {2009}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v102/i12/e125301}, author = {Liu, Y. and Jung, S. and Maxwell, S. and L D Turner and Eite Tiesinga and Paul D Lett} } @article {Kaufman2009, title = {Radio-frequency dressing of multiple Feshbach resonances}, journal = {Phys. Rev. A}, volume = {80}, number = {5}, year = {2009}, month = {11/2009}, pages = {050701(R)}, keywords = {2009}, issn = {1050-2947}, doi = {10.1103/PhysRevA.80.050701}, author = {Kaufman, A. and Russell P Anderson and Thomas M Hanna and Eite Tiesinga and Paul S Julienne and Hall, D.} } @article {2464, title = {Repetitive Readout of a Single Electronic Spin via Quantum Logic with Nuclear Spin Ancillae}, journal = {Science}, volume = {326}, year = {2009}, month = {9/2009}, pages = {267-272}, chapter = {5950}, doi = {10.1126/science.1176496}, author = {L Jiang and J. S. Hodges and J. R. Maze and P. Maurer and Jared M Taylor and D. G. Cory and P. R. Hemmer and R. L. Walsworth and A. Yacoby and A. S. Zibrov and Mikhail D Lukin} } @article {Iskin2009a, title = {Rotation-induced superfluid-normal phase separation in trapped Fermi gases}, journal = {Phys. Rev. A}, volume = {79}, number = {5}, year = {2009}, month = {may}, keywords = {2009}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v79/i5/e053621}, author = {Iskin, M. and Eite Tiesinga} } @article { ISI:000262977900105, title = {Skyrmion versus vortex flux lattices in p-wave superconductors}, journal = {PHYSICAL REVIEW B}, volume = {79}, number = {1}, year = {2009}, month = {JAN}, issn = {1098-0121}, doi = {10.1103/PhysRevB.79.014517}, author = {Li, Qi and Toner, John and Belitz, D.} } @article { ISI:000261214500076, title = {Anomalous Nernst effect from a chiral d-density-wave state in underdoped cuprate superconductors}, journal = {PHYSICAL REVIEW B}, volume = {78}, number = {17}, year = {2008}, month = {NOV}, issn = {1098-0121}, doi = {10.1103/PhysRevB.78.174508}, author = {Zhang, Chuanwei and Tewari, Sumanta and Yakovenko, Victor M. and S. Das Sarma} } @article { ISI:000255237200053, title = {Anyonic braiding in optical lattices (vol 104, pg 18415, 2007)}, journal = {PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA}, volume = {105}, number = {15}, year = {2008}, month = {APR 15}, pages = {5945}, issn = {0027-8424}, doi = {10.1073/pnas.0802500105}, author = {Zhang, Chuanwei and Scarola, V. W. and Tewari, Sumanta and S. Das Sarma} } @article { ISI:000262245200010, title = {Boson Hubbard model with weakly coupled fermions}, journal = {PHYSICAL REVIEW B}, volume = {78}, number = {22}, year = {2008}, month = {DEC}, issn = {1098-0121}, doi = {10.1103/PhysRevB.78.220504}, author = {Lutchyn, Roman M. and Tewari, Sumanta and S. Das Sarma} } @article { ISI:000258538600041, title = {Chirality-induced dynamic Kohn anomalies in graphene}, journal = {PHYSICAL REVIEW LETTERS}, volume = {101}, number = {6}, year = {2008}, month = {AUG 8}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.101.066401}, author = {Tse, Wang-Kong and Hu, Ben Yu-Kuang and S. Das Sarma} } @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 {DeMille2008, title = {Enhanced Sensitivity to Variation of me/mp in Molecular Spectra}, journal = {Phys. Rev. Lett.}, volume = {100}, number = {4}, year = {2008}, month = {jan}, keywords = {2008, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v100/i4/e043202}, author = {DeMille, D and Sainis, S and Sage, J and Bergeman, T and Svetlana Kotochigova and Eite Tiesinga} } @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 { ISI:000260574300067, title = {Ginzburg-Landau theory for the conical cycloid state in multiferroics: Applications to CoCr2O4}, journal = {PHYSICAL REVIEW B}, volume = {78}, number = {14}, year = {2008}, month = {OCT}, issn = {1098-0121}, doi = {10.1103/PhysRevB.78.144426}, author = {Zhang, Chuanwei and Tewari, Sumanta and Toner, John and S. Das Sarma} } @article { ISI:000260574300068, title = {Goldstone modes and electromagnon fluctuations in the conical cycloid state of a multiferroic}, journal = {PHYSICAL REVIEW B}, volume = {78}, number = {14}, year = {2008}, month = {OCT}, issn = {1098-0121}, doi = {10.1103/PhysRevB.78.144427}, author = {Tewari, Sumanta and Zhang, Chuanwei and Toner, John and S. Das Sarma} } @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 {Ma2008, title = {Influence of the trap shape on the detection of the superfluid{\textemdash}Mott-insulator transition}, journal = {Phys. Rev. A}, volume = {78}, number = {2}, year = {2008}, month = {aug}, keywords = {2008, Single Fellow}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v78/i2/e023605}, author = {Ma, Ping and Yang, Kai and Pollet, Lode and J V Porto and Troyer, Matthias and Zhang, Fu} } @article {A.K.Thompson2008, title = {Observation of the He-3 (n,tp) reaction by detection of far-ultraviolet radiation}, journal = {Jour. Res. NIST}, number = {113}, year = {2008}, pages = {67{\textendash}78}, keywords = {2008, Single Fellow}, author = {A K Thompson and Charles W Clark and R E Vest and P P Hughes and M A Coplan and J W Cooper} } @article { ISI:000260141300002, title = {p(x) + ip(y) Superfluid from s-Wave Interactions of Fermionic Cold Atoms}, journal = {PHYSICAL REVIEW LETTERS}, volume = {101}, number = {16}, year = {2008}, month = {OCT 17}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.101.160401}, author = {Zhang, Chuanwei and Tewari, Sumanta and Lutchyn, Roman M. and S. Das Sarma} } @article {Mitra2008, title = {Quantum behavior of a dc SQUID phase qubit}, journal = {Phys. Rev. B}, volume = {77}, number = {21}, year = {2008}, month = {jun}, keywords = {2008, CMAMO, Multiple Fellows}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v77/i21/e214512}, author = {Kaushik Mitra and Frederick W Strauch and Christopher J Lobb and Jeffrey R Anderson and F C Wellstood and Eite Tiesinga} } @article { ISI:000259965000006, title = {Realizing the Strongly Correlated d-Wave Mott-Insulator State in a Fermionic Cold-Atom Optical Lattice}, journal = {PHYSICAL REVIEW LETTERS}, volume = {101}, number = {15}, year = {2008}, month = {OCT 10}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.101.150406}, author = {Peterson, Michael R. and Zhang, Chuanwei and Tewari, Sumanta and S. Das Sarma} } @article {Tewari2008a, title = {Testable Signatures of Quantum Nonlocality in a Two-Dimensional Chiral p-Wave Superconductor}, journal = {Phys. Rev. Lett.}, volume = {100}, number = {2}, year = {2008}, month = {jan}, keywords = {2008, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v100/i2/e027001}, author = {Tewari, Sumanta and Zhang, Chuanwei and S. Das Sarma and Chetan Nayak and Lee, Dung-Hai} } @article {Tewari2008, title = {Time-Reversal Symmetry Breaking by a (d+id) Density-Wave State in Underdoped Cuprate Superconductors}, journal = {Phys. Rev. Lett.}, volume = {100}, number = {21}, year = {2008}, month = {may}, keywords = {2008, Multiple Fellows}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v100/i21/e217004}, author = {Tewari, Sumanta and Zhang, Chuanwei and Victor M Yakovenko and S. Das Sarma} } @article {Strauch2008, title = {Tunneling phase gate for neutral atoms in a double-well lattice}, journal = {Phys. Rev. A}, volume = {77}, number = {5}, year = {2008}, month = {may}, keywords = {2008, Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v77/i5/e050304}, author = {Frederick W Strauch and Edwards, Mark and Eite Tiesinga and Carl J Williams and Charles W Clark} } @article {Naidon2008, title = {Two-Body Transients in Coupled Atomic-Molecular Bose-Einstein Condensates}, journal = {Phys. Rev. Lett.}, volume = {100}, number = {9}, year = {2008}, month = {mar}, keywords = {2008, Multiple Fellows}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v100/i9/e093001}, author = {Pascal Naidon and Eite Tiesinga and Paul S Julienne} } @article {Kitagawa2008, title = {Two-color photoassociation spectroscopy of ytterbium atoms and the precise determinations of s-wave scattering lengths}, journal = {Phys. Rev. A}, volume = {77}, number = {1}, year = {2008}, month = {jan}, keywords = {2008, Single Fellow}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v77/i1/e012719}, author = {Kitagawa, Masaaki and Katsunari Enomoto and Kasa, Kentaro and Yoshiro Takahashi and Roman Ciurylo and Pascal Naidon and Paul S Julienne} } @article {Zhang2007a, title = {Anyonic braiding in optical lattices}, journal = {PNAS}, volume = {104}, number = {47}, year = {2007}, month = {nov}, pages = {18415{\textendash}20}, abstract = {Topological quantum states of matter, both Abelian and non-Abelian, are characterized by excitations whose wavefunctions undergo nontrivial statistical transformations as one excitation is moved (braided) around another. Topological quantum computation proposes to use the topological protection and the braiding statistics of a non-Abelian topological state to perform quantum computation. The enormous technological prospect of topological quantum computation provides new motivation for experimentally observing a topological state. Here, we explicitly work out a realistic experimental scheme to create and braid the Abelian topological excitations in the Kitaev model built on a tunable robust system, a cold atom optical lattice. We also demonstrate how to detect the key feature of these excitations: their braiding statistics. Observation of this statistics would directly establish the existence of anyons, quantum particles that are neither fermions nor bosons. In addition to establishing topological matter, the experimental scheme we develop here can also be adapted to a non-Abelian topological state, supported by the same Kitaev model but in a different parameter regime, to eventually build topologically protected quantum gates.}, keywords = {2007, Single Fellow}, issn = {1091-6490}, url = {http://www.pnas.org/cgi/content/abstract/104/47/18415}, author = {Zhang, Chuanwei and V W Scarola and Tewari, Sumanta and S. Das Sarma} } @article {Zhang2007b, title = {Bell{\textquoteright}s Inequality and Universal Quantum Gates in a Cold-Atom Chiral Fermionic p-Wave Superfluid}, journal = {Phys. Rev. Lett.}, volume = {99}, number = {22}, year = {2007}, month = {nov}, keywords = {2007, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v99/i22/e220502}, author = {Zhang, Chuanwei and Tewari, Sumanta and S. Das Sarma} } @conference {KrzysztofSzymaniec2007, title = {Cancellation of the Collisional Frequency Shift in Caesium Fountain Clocks - OSA Technical Digest (CD)}, booktitle = {Conference on Coherence and Quantum Optics}, year = {2007}, month = {jun}, pages = {CSuA13}, publisher = {Optical Society of America}, organization = {Optical Society of America}, abstract = {We have observed the cancellation of the collisional frequency shift in primary caesium fountain clocks. We present systematic experimental study of the effect and a theoretical model explaining our observations.}, keywords = {2007, and metrology, Atomic and molecular physics, Effects of collisions, Instrumentation, measurement, Metrology, Multiple Fellows}, url = {http://www.opticsinfobase.org/abstract.cfm?URI=CQO-2007-CSuA13}, author = {Krzysztof Szymaniec and Witold Chalupczak and Eite Tiesinga and Carl J Williams and Stefan Weyers and Robert Wynands} } @article {Tse2007b, title = {Coulomb drag and spin drag in the presence of spin-orbit coupling}, journal = {Phys. Rev. B}, volume = {75}, number = {4}, year = {2007}, month = {jan}, keywords = {2007, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v75/i4/e045333}, author = {Tse, Wang-Kong and S. Das Sarma} } @article {Tiesinga2007, title = {Determination of the scattering length of the p 3+ potential of 87RbCs}, journal = {Phys. Rev. A}, year = {2007}, pages = {022707}, keywords = {2007, Single Fellow}, author = {Eite Tiesinga} } @article {Naidon2007, title = {Effective-range description of a Bose gas under strong one- or two-dimensional confinement}, journal = {New J. Phys.}, volume = {9}, number = {1}, year = {2007}, month = {jan}, pages = {19{\textendash}19}, keywords = {2007, Multiple Fellows}, issn = {1367-2630}, url = {http://adsabs.harvard.edu/abs/2007NJPh....9...19N}, author = {Pascal Naidon and Eite Tiesinga and Mitchell, William F and Paul S Julienne} } @article {Terraciano2007, title = {Enhanced spontaneous emission into the mode of a cavity QED system}, journal = {Optics Letters}, volume = {32}, number = {8}, year = {2007}, month = {apr}, pages = {982}, publisher = {OSA}, abstract = {We study the light generated by spontaneous emission into a mode of a cavity QED system under weak excitation of the orthogonally polarized mode. Operating in the intermediate regime of cavity QED with comparable coherent and decoherent coupling constants, we find an enhancement of the emission into the undriven cavity mode by more than a factor of 18.5 over that expected by the solid angle subtended by the mode. A model that incorporates three atomic levels and two polarization modes quantitatively explains the observations.}, keywords = {2007, Fluorescence, Quantum electrodynamics, Quantum optics, Single Fellow}, issn = {0146-9592}, url = {http://ol.osa.org/abstract.cfm?URI=ol-32-8-982}, author = {Terraciano, M. L. and Knell, R. Olson and Freimund, D. L. and Luis A Orozco and Clemens, J. P. and Rice, P. R.} } @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 {Tewari2007, title = {Index Theorem for the Zero Modes of Majorana Fermion Vortices in Chiral p-Wave Superconductors}, journal = {Phys. Rev. Lett.}, volume = {99}, number = {3}, year = {2007}, month = {jul}, keywords = {2007, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v99/i3/e037001}, author = {Tewari, Sumanta and S. Das Sarma and Lee, Dung-Hai} } @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 {DasSarma2007, title = {Many-body interaction effects in doped and undoped graphene: Fermi liquid versus non-Fermi liquid}, 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/e121406}, author = {S. Das Sarma and E H Hwang and Tse, Wang-Kong} } @article {Tan2007, title = {Measurement of Scattering Rate and Minimum Conductivity in Graphene}, journal = {Phys. Rev. Lett.}, volume = {99}, number = {24}, year = {2007}, month = {dec}, keywords = {2007, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v99/i24/e246803}, author = {Tan, Y.-W. and Zhang, Y. and Bolotin, K. and Zhao, Y and Shaffique Adam and E H Hwang and S. Das Sarma and Stormer, H. L. and Kim, P.} } @article {Tse2007, title = {Phonon-Induced Many-Body Renormalization of the Electronic Properties of Graphene}, journal = {Phys. Rev. Lett.}, volume = {99}, number = {23}, year = {2007}, month = {dec}, keywords = {2007, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v99/i23/e236802}, author = {Tse, Wang-Kong and S. Das Sarma} } @article { ISI:000243895600152, title = {Publisher{\textquoteright}s note: Coulomb drag and spin drag in the presence of spin-orbit coupling {[}Phys. Rev. B 75, 045333 (2007)]}, journal = {PHYSICAL REVIEW B}, volume = {75}, number = {4}, year = {2007}, month = {JAN}, issn = {1098-0121}, doi = {10.1103/PhysRevB.75.049902}, author = {Tse, Wang-Kong and S. Das Sarma} } @article {Tewari2007a, title = {Quantum computation using vortices and majorana zero modes of a px + ipy superfluid of fermionic cold atoms}, journal = {Phys. Rev. Lett.}, volume = {98}, number = {1}, year = {2007}, month = {jan}, pages = {010506}, abstract = {We propose to use the recently predicted two-dimensional "weak-pairing" px + ipy superfluid state of fermionic cold atoms as a platform for topological quantum computation. In the core of a vortex, this state supports a zero-energy Majorana mode, which moves to finite energy in the corresponding topologically trivial "strong-pairing" state. By braiding vortices in the "weak-pairing" state, unitary quantum gates can be applied to the Hilbert space of Majorana zero modes. For readout of the topological qubits, we propose realistic schemes suitable for atomic superfluids.}, keywords = {2007, Single Fellow}, issn = {0031-9007}, url = {http://www.ncbi.nlm.nih.gov/pubmed/17358465}, author = {Tewari, Sumanta and S. Das Sarma and Chetan Nayak and Zhang, Chuanwei and Peter Zoller} } @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 {Tse2007a, title = {Theory of Coulomb drag in graphene}, journal = {Phys. Rev. B}, volume = {76}, number = {8}, year = {2007}, month = {aug}, keywords = {2007, Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v76/i8/e081401}, author = {Tse, Wang-Kong and Ben Yu-Kuang Hu and S. Das Sarma} } @article {Tewari2006, title = {Emergence of Artificial Photons in an Optical Lattice}, journal = {Phys. Rev. Lett.}, volume = {97}, number = {20}, year = {2006}, month = {nov}, pages = {4}, abstract = {We establish the theoretical feasibility of direct analog simulation of the compact U(1) lattice gauge theories in optical lattices with dipolar bosons. We discuss the realizability of the topological Coulomb phase in extended Bose-Hubbard models in several optical lattice geometries. We predict the testable signatures of this emergent phase in noise correlation measurements, thus suggesting the possible emergence of artificial light in optical lattices.}, keywords = {2006, Single Fellow}, issn = {0031-9007}, url = {http://arxiv.org/abs/cond-mat/0605154}, author = {Tewari, Sumanta and V W Scarola and Senthil, T. and S. Das Sarma} } @article {Tang2006, title = {Experimental study of high speed polarization-coding quantum key distribution with sifted-key rates over Mbit/s}, journal = {Optics Express}, volume = {14}, number = {6}, year = {2006}, pages = {2062}, publisher = {OSA}, abstract = {We present a quantitative study of various limitations on quantum cryptographic systems operating with sifted-key rates over Mbit/s. The dead time of silicon APDs not only limits the sifted-key rate but also causes correlation between the neighboring key bits. In addition to the well-known count-rate dependent timing jitter in avalanche photo-diode (APD), the faint laser sources, the vertical cavity surface emission lasers (VCSELs) in our system, also induce a significant amount of data-dependent timing jitter. Both the dead time and the data-dependent timing jitter are major limiting factors in designing QKD systems with sifted-key rates beyond Mbit/s.}, keywords = {2006, Fiber optics communications, Multiple Fellows, Optical communications, Photon counting, Quantum detectors}, issn = {1094-4087}, url = {http://www.opticsexpress.org/abstract.cfm?URI=oe-14-6-2062}, author = {Tang, Xiao and Ma, Lijun and Mink, Alan and Nakassis, Anastase and Hai Xu and Hershman, Barry and Bienfang, Joshua C. and Su, David and Boisvert, Ronald F. and Charles W Clark and Carl J Williams} } @article {Tse2006, title = {Intrinsic spin Hall effect in the presence of extrinsic spin-orbit scattering}, journal = {Phys. Rev. B}, volume = {74}, number = {24}, year = {2006}, month = {dec}, pages = {245309}, keywords = {2006, Jahn-Teller effect, Magnetomechanical and magnetoelectric effects, magnetostriction, Quantum Hall effects, Single Fellow, Spin polarized transport in semiconductors, Spin-orbit coupling, Zeeman and Stark splitting}, issn = {1098-0121}, url = {http://adsabs.harvard.edu/abs/2006PhRvB..74x5309T}, author = {Tse, Wang-Kong and S. Das Sarma} } @article { ISI:000238696300011, title = {Proposal to stabilize and detect half-quantum vortices in strontium ruthenate thin films: Non-Abelian braiding statistics of vortices in a p(x)+ip(y) superconductor}, journal = {PHYSICAL REVIEW B}, volume = {73}, number = {22}, year = {2006}, month = {JUN}, issn = {1098-0121}, doi = {10.1103/PhysRevB.73.220502}, author = {S. Das Sarma and Nayak, Chetan and Tewari, Sumanta} } @article { ISI:000235252200060, title = {Spin Hall effect in doped semiconductor structures}, journal = {PHYSICAL REVIEW LETTERS}, volume = {96}, number = {5}, year = {2006}, month = {FEB 10}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.96.056601}, author = {Tse, WK and S. Das Sarma} } @article {Ciuryo2006, title = {Stationary phase approximation for the strength of optical Feshbach resonances}, journal = {Phys. Rev. A}, volume = {74}, number = {2}, year = {2006}, pages = {022710}, keywords = {2006, Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v74/i2/e022710}, author = {Roman Ciurylo and Eite Tiesinga and Paul S Julienne} } @article {Jones2006, title = {Ultracold photoassociation spectroscopy: Long-range molecules and atomic scattering}, journal = {Rev. Mod. Phys.}, volume = {78}, number = {2}, year = {2006}, month = {may}, pages = {483{\textendash}535}, keywords = {2006, Multiple Fellows}, issn = {0034-6861}, url = {http://rmp.aps.org/abstract/RMP/v78/i2/p483\_1}, author = {Kevin M Jones and Eite Tiesinga and Paul D Lett and Paul S Julienne} } @article {2398, title = {Nuclear laser spectroscopy of the 3.5 eV transition in Th-229}, journal = {Europhys. Lett.}, volume = {61}, year = {2003}, pages = {181-186}, doi = {10.1209/epl/i2003-00210-x}, author = {E. Peik and Chr. Tamm} }