Dissipation generally leads to the decoherence of a quantum state. In contrast, numerous recent proposals have illustrated that dissipation can also be tailored to stabilize many-body entangled quantum states. While the focus of these works has been primarily on engineering the nonequilibrium steady state, we investigate the buildup of entanglement in the quantum trajectories. Specifically, we analyze the competition between two different dissipation channels arising from two incompatible continuous monitoring protocols. The first protocol locks the phase of neighboring sites upon registering a quantum jump, thereby generating a long-range entanglement through the system, while the second destroys the coherence via a dephasing mechanism. By studying the unraveling of stochastic quantum trajectories associated with the continuous monitoring protocols, we present a transition for the scaling of the averaged trajectory entanglement entropies, from critical scaling to area-law behavior. Our work provides an alternative perspective on the measurement-induced phase transition: the measurement can be viewed as monitoring and registering quantum jumps, offering an intriguing extension of these phase transitions through the long-established realm of quantum optics.

}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.126.123604}, author = {Van Regemortel, Mathias and Cian, Ze-Pei and Seif, Alireza and Dehghani, Hossein and Hafezi, Mohammad} } @article { WOS:000648494200001, title = {Fast Logic with Slow Qubits: Microwave-Activated Controlled-Z Gate on Low-Frequency Fluxoniums}, journal = {Phys. Rev. X}, volume = {11}, number = {2}, year = {2021}, month = {MAY 3}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We demonstrate a controlled-Z gate between capacitively coupled fluxonium qubits with transition frequencies 72.3 and 136.3 MHz. The gate is activated by a 61.6-ns-long pulse at a frequency between noncomputational transitions vertical bar 10 > - vertical bar 20 > and vertical bar 11 > - vertical bar 21 >, during which the qubits complete only four and eight Larmor periods, respectively. The measured gate error of (8 +/- 1) x 10(-3) is limited by decoherence in the noncomputational subspace, which will likely improve in the next-generation devices. Although our qubits are about 50 times slower than transmons, the two-qubit gate is faster than microwave-activated gates on transmons, and the gate error is on par with the lowest reported. Architectural advantages of lowfrequency fluxoniums include long qubit coherence time, weak hybridization in the computational subspace, suppressed residual ZZ-coupling rate (here 46 kHz), and the absence of either excessive parameter-matching or complex pulse-shaping requirements.}, issn = {2160-3308}, doi = {10.1103/PhysRevX.11.021026}, author = {Ficheux, Quentin and Nguyen, Long B. and Somoroff, Aaron and Xiong, Haonan and Nesterov, Konstantin N. and Vavilov, Maxim G. and Manucharyan, Vladimir E.} } @article { WOS:000693643600008, title = {Frustration-induced anomalous transport and strong photon decay in waveguide QED}, journal = {Phys. Rev. Res.}, volume = {3}, number = {3}, year = {2021}, month = {SEP 7}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We study the propagation of photons in a one-dimensional environment consisting of two noninteracting species of photons frustratingly coupled to a single spin 1/2. The ultrastrong frustrated coupling leads to an extreme mixing of the light and matter degrees of freedom, resulting in the disintegration of the spin and a breakdown of the {\textquoteleft}{\textquoteleft}dressed-spin,{{\textquoteright}{\textquoteright}} or polaron, description. Using a combination of numerical and analytical methods, we show that the elastic response becomes increasingly weak at the effective spin frequency, showing instead an increasingly strong and broadband response at higher energies. We also show that the photons can decay into multiple photons of smaller energies. The total probability of these inelastic processes can be as large as the total elastic scattering rate, or half of the total scattering rate, which is as large as it can be. The frustrated spin induces strong anisotropic photon-photon interactions that are dominated by interspecies interactions. Our results are relevant to state-of-the-art circuit and cavity quantum electrodynamics experiments.}, doi = {10.1103/PhysRevResearch.3.L032058}, author = {Belyansky, Ron and Whitsitt, Seth and Lundgren, Rex and Wang, Yidan and Vrajitoarea, Andrei and Houck, Andrew A. and Gorshkov, V, Alexey} } @article {cian_many-body_2021, title = {Many-{Body} {Chern} {Number} from {Statistical} {Correlations} of {Randomized} {Measurements}}, journal = {Phys. Rev. Lett.}, volume = {126}, number = {5}, year = {2021}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {feb}, abstract = {One of the main topological invariants that characterizes several topologically ordered phases is the many-body Chern number (MBCN). Paradigmatic examples include several fractional quantum Hall phases, which are expected to be realized in different atomic and photonic quantum platforms in the near future. Experimental measurement and numerical computation of this invariant are conventionally based on the linear-response techniques that require having access to a family of states, as a function of an external parameter, which is not suitable for many quantum simulators. Here, we propose an ancilla-free experimental scheme for the measurement of this invariant, without requiring any knowledge of the Hamiltonian. Specifically, we use the statistical correlations of randomized measurements to infer the MBCN of a wave function. Remarkably, our results apply to disklike geometries that are more amenable to current quantum simulator architectures.

}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.126.050501}, author = {Cian, Ze-Pei and Dehghani, Hossein and Elben, Andreas and Vermersch, Benoit and Zhu, Guanyu and Barkeshli, Maissam and Zoller, Peter and Hafezi, Mohammad} } @article {vu_moire_2021, title = {Moire versus {Mott}: {Incommensuration} and {Interaction} in {One}-{Dimensional} {Bichromatic} {Lattices}}, journal = {Phys. Rev. Lett.}, volume = {126}, number = {3}, year = {2021}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {jan}, abstract = {Inspired by the rich physics of twisted 2D bilayer moire systems, we study Coulomb interacting systems subjected to two overlapping finite ID lattice potentials of unequal periods through exact numerical diagonalization. Unmatching underlying lattice periods lead to a 1D bichromatic {\textquotedblleft}moire{\textquotedblright} superlattice with a large unit cell and consequently a strongly flattened band, exponentially enhancing the effective dimensionless electron-electron interaction strength and manifesting clear signatures of enhanced Mott gaps at discrete fillings. An important nonperturbative finding is a remarkable fine-tuning effect of the precise lattice commensuration, where slight variations in the relative lattice periods may lead to a suppression of the correlated insulating phase, in qualitative agreement with the observed fragility of the correlated insulating phase in twisted bilayer graphene. Our predictions, which should be directly verifiable in bichromatic optical lattices, establish that the competition between interaction and incommensuration is a key element of the physics of moire superlattices.

}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.126.036803}, author = {Vu, DinhDuy and Sankar Das Sarma} } @article { WOS:000655905200001, title = {Presence versus absence of two-dimensional Fermi surface anomalies}, journal = {Phys. Rev. B}, volume = {103}, number = {20}, year = {2021}, month = {MAY 28}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We theoretically consider Fermi surface anomalies manifesting in the temperature-dependent quasiparticle properties of two-dimensional (2D) interacting electron systems, comparing and contrasting with the corresponding three-dimensional (3D) Fermi liquid situation. In particular, employing microscopic many-body perturbative techniques, we obtain analytically the leading-order and the next-to-leading-order interaction corrections to the renormalized effective mass for three distinct physical interaction models: electron-phonon, electron-paramagnon, and electron-electron Coulomb coupling. We find that the 2D renormalized effective mass does not develop any Fermi surface anomaly due to electron-phonon interaction, manifesting O(T-2) temperature correction and thus remaining consistent with the Sommerfeld expansion of the noninteracting Fermi function, in contrast to the corresponding 3D situation where the temperature correction to the renormalized effective mass has the anomalous T-2 log T behavior. In contrast, both electron-paramagnon and electron-electron interactions lead to the anomalous O(T) corrections to the 2D effective mass renormalization in contrast to T-2 log T behavior in the corresponding 3D interacting systems. We provide detailed analytical results, and comment on the conditions under which a T-2 log T term could possibly arise in the 2D quasiparticle effective mass from electron-phonon interactions. We also compare results for the temperature-dependent specific heat in the interacting 2D and 3D Fermi systems, using the close connection between the effective mass and specific heat.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.103.205154}, author = {Buterakos, Donovan and DinhDuy Vu and Yu, Jiabin and Das Sarma, Sankar} } @article { WOS:000674761000001, title = {Proposal for Entangling Gates on Fluxonium Qubits via a Two-Photon Transition}, journal = {PRX Quantum}, volume = {2}, number = {2}, year = {2021}, month = {JUN 22}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We propose a family of microwave-activated entangling gates on two capacitively coupled fluxonium qubits. A microwave pulse applied to either qubit at a frequency near the half-frequency of the vertical bar 00 >-vertical bar 11 > transition induces two-photon Rabi oscillations with a negligible leakage outside the computational subspace, owing to the strong anharmonicity of fluxoniums. By adjusting the drive frequency, amplitude, and duration, we obtain the gate family that is locally equivalent to the fermionic-simulation gates such as root SWAP-like and controlled-phase gates. The gate error can be tuned below 10(-4) for a pulse duration under 100 ns without excessive circuit parameter matching. Given that the fluxonium coherence time can exceed 1 ms, our gate scheme is promising for large-scale quantum processors.}, doi = {10.1103/PRXQuantum.2.020345}, author = {Nesterov, Konstantin N. and Ficheux, Quentin and Manucharyan, Vladimir E. and Vavilov, Maxim G.} } @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:000694043500003, title = {Reentrant Bloch ferromagnetism}, journal = {Phys. Rev. B}, volume = {104}, number = {10}, year = {2021}, month = {SEP 8}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {An interacting electron liquid in two (2D) and three (3D) dimensions may undergo a paramagnetic-to-ferromagnetic quantum spin polarization transition at zero applied magnetic field, driven entirely by exchange interactions, as the system density (n) is decreased. This is known as Bloch ferromagnetism. We show theoretically that the application of an external magnetic field (B), which directly spin polarizes the system through Zeeman spin splitting, has an interesting effect on Bloch ferromagnetism if the applied field and carrier density are both decreased (from some initial applied high magnetic field at a high carrier density) in a power-law manner, B similar to n(p). For pp(c), the system may undergo two transitions if starting from the fully spin-polarized state: first, a weak second-order transition at high density and field from the field-induced fully polarized phase to the partially polarized phase; and then, at a lower field and density, a reentrant first-order transition back to the fully spin-polarized phase again with a single Fermi surface.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.104.L100405}, author = {DinhDuy Vu and Das Sarma, S.} } @article { WOS:000707469900008, title = {Superconductors with anomalous Floquet higher-order topology}, journal = {Phys. Rev. B}, volume = {104}, number = {14}, year = {2021}, month = {OCT 11}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We develop a general theory for two-dimensional (2D) anomalous Floquet higher-order topological superconductors (AFHOTSCs), which are dynamical Majorana-carrying phases of matter with no static counterpart. Despite the triviality of its bulk Floquet bands, an AFHOTSC generically features the simultaneous presence of corner-localized Majorana modes at both zero and pi/T quasienergies, a phenomenon beyond the scope of any static topological band theory. We show that the key to AFHOTSCs is their unavoidable singular behavior in the phase spectrum of the bulk time-evolution operator. By mapping such evolution-phase singularities to the stroboscopic boundary signatures, we classify 2D AFHOTSCs that are protected by a rotation group symmetry in symmetry class D. We further extract a higher-order topological index for unambiguously predicting the presence of Floquet corner Majorana modes, which we confirm numerically. Our theory serves as a milestone towards a dynamical topological theory for Floquet superconducting systems.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.104.L140502}, author = {Vu, DinhDuy and Zhang, Rui-Xing and Yang, Zhi-Cheng and Das Sarma, S.} } @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.

Motivated by recent developments on the fabrication and control of semiconductor-based quantum dots, we theoretically study a finite system of tunnel-coupled quantum dots with the electrons interacting through the long-range Coulomb interaction. When the interelectron separation is large and the quantum dot confinement potential is weak, the system behaves as an effective Wigner crystal with a period determined by the electron average density with considerable electron hopping throughout the system. For stronger periodic confinement potentials, however, the system makes a crossover to a Mott-type ground state where the electrons are completely localized at the individual dots with little interdot tunneling. In between these two phases, the system is essentially a strongly correlated electron liquid with intersite electron hopping constrained by strong Coulomb interaction. We characterize this Wigner-Mott-liquid quantum crossover with detailed numerical finite-size diagonalization calculations of the coupled interacting quantum dot system, showing that these phases can be smoothly connected by tuning the system parameters. Experimental feasibility of observing such a hopping-tuned Wigner-Mott-liquid crossover in currently available semiconductor quantum dots is discussed. In particular, we connect our theoretical results to recent quantum-dot-based quantum emulation experiments where a collective Coulomb blockade was demonstrated. We discuss realistic disorder effects on our theoretical findings. One conclusion of our work is that experiments must explore lower density quantum dot arrays in order to clearly observe the Wigner phase although the Mott-liquid crossover phenomenon should already manifest itself in the currently available quantum dot arrays. We also suggest a direct experimental electron density probe, such as atomic force microscopy or scanning tunneling microscopy, for a clear observation of the effective Wigner crystal phase.

}, doi = {10.1103/PhysRevResearch.2.023060}, author = {Vu, DinhDuy and Das Sarma, Sankar} } @article { ISI:000532064500001, title = {Counting statistics of microwave photons in circuit QED}, journal = {Phys. Rev. A}, volume = {101}, number = {5}, year = {2020}, month = {MAY 13}, pages = {052321}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {In superconducting circuit architectures for quantum computing, microwave resonators are often used both to isolate qubits from the electromagnetic environment and to facilitate qubit state readout. We analyze the full counting statistics of photons emitted from such driven readout resonators both in and beyond the dispersive approximation. We calculate the overlap between emitted-photon distributions for the two qubit states and explore strategies for its minimization with the purpose of increasing fidelity of intensity-sensitive readout techniques. In the dispersive approximation and at negligible qubit relaxation, both distributions are Poissonian, and the overlap between them can be easily made arbitrarily small. Nondispersive terms of the Hamiltonian generate squeezing and the Purcell decay with the latter effect giving the dominant contribution to the overlap between two distributions.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.101.052321}, author = {Nesterov, Konstantin N. and Pechenezhskiy, V, Ivan and Vavilov, Maxim G.} } @article {colussi_cumulant_2020, title = {Cumulant theory of the unitary {Bose} gas: {Prethermal} and {Efimovian} dynamics}, 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 = {We study the quench of a degenerate ultracold Bose gas to the unitary regime, where interactions are as strong as allowed by quantum mechanics. We lay the foundation of a cumulant theory able to simultaneously capture the three-body Efimov effect and ergodic evolution. After an initial period of rapid quantum depletion, a universal prethermal stage is established, characterized by a kinetic temperature and an emergent Bogoliubov dispersion law, while the microscopic degrees of freedom remain far from equilibrium. Integrability is then broken by higher-order interaction terms in the many-body Hamiltonian, leading to a momentum-dependent departure from power law to decaying exponential behavior of the occupation numbers at large momentum. We also find signatures of the Efimov effect in the many-body dynamics and make a precise identification between the observed beating phenomenon and the binding energy of an Efimov trimer. Throughout the paper, our predictions for a uniform gas are quantitatively compared with experimental results for quenched unitary Bose gases in uniform potentials.}, issn = {2469-9926}, doi = {10.1103/PhysRevA.102.063314}, author = {Colussi, V. E. and Kurkjian, H. and Van Regemortel, M. and Musolino, S. and van de Kraats, J. and Wouters, M. and Kokkelmans, S. J. J. M. F.} } @article { ISI:000562629600008, title = {Engineering quantum Hall phases in a synthetic bilayer graphene system}, journal = {Phys. Rev. B}, volume = {102}, number = {8}, year = {2020}, month = {AUG 26}, pages = {085430}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Synthetic quantum Hall bilayer (SQHB), realized by optically driven monolayer graphene in the quantum Hall regime, provides a flexible platform for engineering quantum Hall phases as discussed in Ghazaryan et al. {[}Phys. Rev. Lett. 119, 247403 (2017)]. The coherent driving which couples two Landau levels mimics an effective tunneling between synthetic layers. The tunneling strength, the effective Zeeman coupling, and two-body interaction matrix elements are tunable by varying the driving frequency and the driving strength. Using infinite density matrix renormalization group techniques combined with exact diagonalization, we show that the system exhibits a non-Abelian bilayer Fibonacci phase at filling fraction nu = 2/3. Moreover, at integer filling nu = 1, the SQHB exhibits quantum Hall ferromagnetism. Using Hartree-Fock theory and exact diagonalization, we show that excitations of the quantum Hall ferromagnet are topological textures known as skyrmions.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.102.085430}, author = {Cian, Ze-Pei and Grass, Tobias and Vaezi, Abolhassan and Liu, Zhao and Hafezi, Mohammad} } @article { 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 {sau_anyons_2020, title = {From anyons to {Majoranas}}, journal = {Nat. Rev. Phys.}, volume = {2}, number = {12}, year = {2020}, note = {Place: CAMPUS, 4 CRINAN ST, LONDON, N1 9XW, ENGLAND Publisher: SPRINGERNATURE Type: Editorial Material}, month = {dec}, pages = {667{\textendash}668}, abstract = {Key advances Beam-splitter and interferometric measurements in the quantum Hall regime provide the strongest experimental proof to date of exotic anyonic particles. Individual states inside superconducting vortices, called Caroli-de Gennes-Matricon states, have been experimentally observed in low-density topological superconductors. Access to the Caroli-de Gennes-Matricon states provides a new platform in which anyonic particles may be braided and detected in three dimensional topological superconductors. Anyons, particles that are neither bosons nor fermions, were predicted in the 1980s, but strong experimental evidence for the existence of the simplest type of anyons has only emerged this year. Further theoretical and experimental advances promise to nail the existence of more exotic types of anyons, such as Majorana fermions, which would make topological quantum computation possible. Strong experimental evidence for the existence of the simplest type of anyons (particles that are neither bosons nor fermions) has emerged this year. The next step is to uncover more exotic types of anyons, such as Majorana fermions.

}, doi = {10.1038/s42254-020-00251-9}, author = {Sau, Jay and Simon, Steven and Vishveshwara, Smitha and Williams, James R.} } @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 { ISI:000522116800007, title = {Incorporating the Stern-Gerlach delayed-choice quantum eraser into the undergraduate quantum mechanics curriculum}, journal = {Am. J. Phys.}, volume = {88}, number = {4}, year = {2020}, month = {APR}, pages = {298-307}, publisher = {AMER INST PHYSICS}, type = {Article}, abstract = {As {\textquoteleft}{\textquoteleft}Stern-Gerlach first{{\textquoteright}{\textquoteright}} becomes increasingly popular in the undergraduate quantum mechanics curriculum, we show how one can extend the treatment found in conventional textbooks to cover some exciting new quantum phenomena. Namely, we illustrate how one can describe a delayed choice variant of the quantum eraser which is realized within the Stern-Gerlach framework. Covering this material allows the instructor to reinforce notions of changes in basis functions, quantum superpositions, quantum measurements, and the complementarity principle as expressed in whether we know {\textquoteleft}{\textquoteleft}which-way{{\textquoteright}{\textquoteright}} information or not. It also allows the instructor to dispel common misconceptions of when a measurement occurs and when a system is in a superposition of states.}, issn = {0002-9505}, doi = {10.1119/10.0000519}, author = {Courtney, William F. and Vieira, Lucas B. and Julienne, Paul S. and Freericks, James K.} } @article {19051, title = {Many-Body Level Statistics of Single-Particle Quantum Chaos}, journal = {Phys. Rev. Lett.}, volume = {125}, year = {2020}, month = {Dec}, pages = {250601}, doi = {10.1103/PhysRevLett.125.250601}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.125.250601}, author = {Liao, Yunxiang and Vikram, Amit and Galitski, Victor} } @article {16666, title = {Many-body topological invariants from randomized measurements in synthetic quantum matter}, journal = {Science Advances}, volume = {6}, year = {2020}, abstract = {Many-body topological invariants, as quantized highly nonlocal correlators of the many-body wave function, are at the heart of the theoretical description of many-body topological quantum phases, including symmetry-protected and symmetry-enriched topological phases. Here, we propose and analyze a universal toolbox of measurement protocols to reveal many-body topological invariants of phases with global symmetries, which can be implemented in state-of-the-art experiments with synthetic quantum systems, such as Rydberg atoms, trapped ions, and superconducting circuits. The protocol is based on extracting the many-body topological invariants from statistical correlations of randomized measurements, implemented with local random unitary operations followed by site-resolved projective measurements. We illustrate the technique and its application in the context of the complete classification of bosonic symmetry-protected topological phases in one dimension, considering in particular the extended Su-Schrieffer-Heeger spin model, as realized with Rydberg tweezer arrays.

}, doi = {10.1126/sciadv.aaz3666}, url = {https://advances.sciencemag.org/content/6/15/eaaz3666}, author = {Elben, Andreas and Yu, Jinlong and Zhu, Guanyu and Hafezi, Mohammad and Pollmann, Frank and Zoller, Peter and Vermersch, Beno\^{\i}t} } @article { ISI:000565086500001, title = {Multiterminal Josephson Effect}, journal = {Phys. Rev. X}, volume = {10}, number = {3}, year = {2020}, month = {SEP 2}, pages = {031051}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We report a probable observation of the dc Josephson effect in mesoscopic junctions of three and four superconductors. The devices are fabricated in a top-down fashion from a hybrid semiconductor-superconductor InAs/Al epitaxial heterostructure. In general, the critical current of an N-terminal junction is an (N - 1)-dimensional hypersurface in the space of bias currents, which can be reduced to a set of critical current contours. The geometry of critical current contours exhibits nontrivial responses to electrical gating, magnetic field, and phase bias, and it can be reproduced by the scattering formulation of the Josephson effect generalized to the case of N > 2. Besides establishing solid ground beneath a host of recent theory proposals, our experiment accomplishes an important step toward creating trijunctions of topological superconductors, essential for braiding operations.}, issn = {2160-3308}, doi = {10.1103/PhysRevX.10.031051}, author = {Pankratova, Natalia and Lee, Hanho and Kuzmin, Roman and Wickramasinghe, Kaushini and Mayer, William and Yuan, Joseph and Vavilov, Maxim G. and Shabani, Javad and Manucharyan, Vladimir E.} } @article {xie_observation_2020, title = {Observation of {Efimov} {Universality} across a {Nonuniversal} {Feshbach} {Resonance} in {K}-39}, journal = {Phys. Rev. Lett.}, volume = {125}, number = {24}, year = {2020}, note = {Place: ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA Publisher: AMER PHYSICAL SOC Type: Article}, month = {dec}, abstract = {We study three-atom inelastic scattering in ultracold K-39 near a Feshbach resonance of intermediate coupling strength. The nonuniversal character of such resonance leads to an abnormally large Efimov absolute length scale and a relatively small effective range r(e), allowing the features of the 39 K Efimov spectrum to be better isolated from the short-range physics. Meticulous characterization of and correction for finite-temperature effects ensure high accuracy on the measurements of these features at large-magnitude scattering lengths. For a single Feshbach resonance, we unambiguously locate four distinct features in the Efimov structure. Three of these features form ratios that obey the Efimov universal scaling to within 10\%, while the fourth feature, occurring at a value of scattering length closest to r(e), instead deviates from the universal value.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.125.243401}, author = {Xie, Xin and Van de Graaff, Michael J. and Chapurin, Roman and Frye, Matthew D. and Hutson, Jeremy M. and D{\textquoteright}Incao, Jose P. and Julienne, Paul S. and Ye, Jun and Cornell, Eric A.} } @article { ISI:000519701600004, title = {One-dimensional few-electron effective Wigner crystal in quantum and classical regimes}, journal = {Phys. Rev. B}, volume = {101}, number = {12}, year = {2020}, month = {MAR 16}, pages = {125113}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {A system of confined charged electrons interacting via the long-range Coulomb force can form a Wigner crystal due to their mutual repulsion. This happens when the potential energy of the system dominates over its kinetic energy, i.e., at low temperatures for a classical system and at low densities for a quantum one. At T = 0, the system is governed by quantum mechanics, and hence the spatial density peaks associated with crystalline charge localization are sharpened for a lower average density. Conversely, in the classical limit of high temperatures, the crystalline spatial density peaks are suppressed (recovered) at a lower (higher) average density. In this paper, we study those two limits separately using an exact diagonalization of small one-dimensional (1D) systems containing few (\<10) electrons and propose an approximate method to connect them into a unified effective phase diagram for Wigner few-electron crystallization. The result is a qualitative quantum-classical crossover phase diagram of an effective 1D Wigner crystal. We show that although such a 1D system is at best an effective crystal with no true long-range order (and thus no real phase transition), the spatial density peaks associated with the quasicrystallization should be experimentally observable in a few-electron 1D system. We find that the effective crystalline structure slowly disappears with both the crossover average density and crossover temperature for crystallization decreasing with increasing particle number, consistent with the absence of any true long-range 1D order. Thus, an effective few-electron 1D Wigner crystal may be construed either as existing at all densities (manifesting short-range order) or as nonexisting at all densities (not manifesting any long-range order). Within one unified description, we show through exact theoretical calculations how a small 1D system interacting through the long-range Coulomb interaction could manifest effective Wigner solid behavior both in classical and quantum regimes. In fact, one peculiar aspect of the effective finite-size nature of 1D Wigner crystallization we find is that even a short-range interaction would lead to a finite-size 1D crystal, except that the crystalline order vanishes much faster with increasing system size in the short-range interacting system compared with the long-range interacting one.

}, issn = {2469-9950}, doi = {10.1103/PhysRevB.101.125113}, author = {DinhDuy Vu and Das Sarma, Sankar} } @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:000550577700002, title = {Real-time dynamics of string breaking in quantum spin chains}, journal = {Phys. Rev. B}, volume = {102}, number = {1}, year = {2020}, month = {JUL 21}, pages = {014308}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {String breaking is a central dynamical process in theories featuring confinement, where a string connecting two charges decays at the expense of the creation of new particle-antiparticle pairs. Here, we show that this process can also be observed in quantum Ising chains where domain walls get confined either by a symmetry-breaking field or by long-range interactions. We find that string breaking occurs, in general, as a two-stage process. First, the initial charges remain essentially static and stable. The connecting string, however, can become a dynamical object. We develop an effective description of this motion, which we find is strongly constrained. In the second stage, which can be severely delayed due to these dynamical constraints, the string finally breaks. We observe that the associated timescale can depend crucially on the initial separation between domain walls and can grow by orders of magnitude by changing the distance by just a few lattice sites. We discuss how our results generalize to one-dimensional confining gauge theories and how they can be made accessible in quantum simulator experiments such as Rydberg atoms or trapped ions.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.102.014308}, author = {Verdel, Roberto and Liu, Fangli and Whitsitt, Seth and Gorshkov, V, Alexey and Heyl, Markus} } @article {vu_time-reversal-invariant_2020, title = {Time-reversal-invariant {C}-2-symmetric higher-order topological superconductors}, 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 = {We propose a minimal lattice model for two-dimensional class DIII superconductors with C-2-protected higher-order topology. Although this class of superconductors cannot be topologically characterized by symmetry eigenvalues at high-symmetry momenta, we propose a simple Wannier-orbital-based real-space diagnosis to unambiguously capture the corresponding higher-order topology. We further identify and characterize a variety of conventional topological phases in our minimal model, including a weak topological superconductor and a nodal topological superconductor with chiral-symmetry protection. The disorder effect is also systematically studied to demonstrate the robustness of higher-order bulk-boundary correspondence. Our theory lays the groundwork for predicting and diagnosing C-2-protected higher-order topology in class DIII superconductors.}, doi = {10.1103/PhysRevResearch.2.043223}, author = {Vu, DinhDuy and Zhang, Rui-Xing and Das Sarma, S.} } @article {vu_tunneling_2020, title = {Tunneling conductance of long-range {Coulomb} interacting {Luttinger} liquid}, 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 = {The theoretical model of the short-range interacting Luttinger liquid predicts a power-law scaling of the density of states and the momentum distribution function around the Fermi surface, which can be readily tested through tunneling experiments. However, some physical systems have long-range interaction, most notably the Coulomb interaction, leading to significantly different behaviors from the short-range interacting system. In this paper, we revisit the tunneling theory for the one-dimensional electrons interacting via the long-range Coulomb force. We show that, even though in a small dynamic range of temperature and bias voltage the tunneling conductance may appear to have a power-law decay similar to short-range interacting systems, the effective exponent is scale dependent and slowly increases with decreasing energy. This factor may lead to the sample-to-sample variation in the measured tunneling exponents. We also discuss the crossover to a free Fermi gas at high energy and the effect of the finite size. Our work demonstrates that experimental tunneling measurements in one-dimensional electron systems should be interpreted with great caution when the system is a Coulomb Luttinger liquid.}, doi = {10.1103/PhysRevResearch.2.023246}, author = {Vu, DinhDuy and Iucci, Anibal and Das Sarma, S.} } @article { ISI:000499991300005, title = {Precision Test of the Limits to Universality in Few-Body Physics}, journal = {Phys. Rev. Lett.}, volume = {123}, number = {23}, year = {2019}, month = {DEC 2}, pages = {233402}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We perform precise studies of two- and three-body interactions near an intermediate-strength Feshbach resonance in K-39 at 33.5820(14) G. Precise measurement of dimer binding energies, spanning three orders of magnitude, enables the construction of a complete two-body coupled-channel model for determination of the scattering lengths with an unprecedented low uncertainty. Utilizing an accurate scattering length map, we measure the precise location of the Efimov ground state to test van der Waals universality. Precise control of the sample{\textquoteright}s temperature and density ensures that systematic effects on the Efimov trimer state are well understood. We measure the ground Efimov resonance location to be at -14.05(17) times the van der Waals length r(vdW), significantly deviating from the value of -9.7r(vdW) predicted by van der Waals universality. We find that a refined multichannel three-body model, built on our measurement of two-body physics, can account for this difference and even successfully predict the Efimov inelasticity parameter eta.}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.123.233402}, author = {Chapurin, Roman and Xie, Xin and Van de Graaff, Michael J. and Popowski, Jared S. and D{\textquoteright}Incao, Jose P. and Julienne, Paul S. and Ye, Jun and Cornell, Eric A.} } @article {ISI:000468373300008, title = {Quantum frequency conversion of a quantum dot single-photon source on a nanophotonic chip}, journal = {Optica}, volume = {6}, number = {5}, year = {2019}, month = {MAY 20}, pages = {563-569}, publisher = {OPTICAL SOC AMER}, type = {Article}, abstract = {Single self-assembled InAs/GaAs quantum dots are promising bright sources of indistinguishable photons for quantum information science. However, their distribution in emission wavelength, due to inhomogeneous broadening inherent to their growth, has limited the ability to create multiple identical sources. Quantum frequency conversion can overcome this issue, particularly if implemented using scalable chip-integrated technologies. Here, we report the first demonstration to our knowledge of quantum frequency conversion of a quantum dot single-photon source on a silicon nanophotonic chip. Single photons from a quantum dot in a micropillar cavity are shifted in wavelength with an on-chip conversion efficiency approximate to 12\%, limited by the linewidth of the quantum dot photons. The intensity auto-correlation function g((2)) (tau) for the frequency-converted light is antibunched with g((2)) (0) = 0.290 +/- 0.030, compared to the before-conversion value g((2)) (0) = 0.080 +/- 0.003. We demonstrate the suitability of our frequency-conversion interface as a resource for quantum dot sources by characterizing its effectiveness across a wide span of input wavelengths (840-980 nm) and its ability to achieve tunable wavelength shifts difficult to obtain by other approaches. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement}, issn = {2334-2536}, doi = {10.1364/OPTICA.6.000563}, author = {Singh, Anshuman and Li, Qing and Liu, Shunfa and Yu, Ying and Lu, Xiyuan and Schneider, Christian and Hoefling, Sven and Lawall, John and Verma, Varun and Mirin, Richard and Nam, Sae Woo and Liu, Jin and Srinivasan, Kartik} } @article {ISI:000471983100001, title = {Thermal radiation as a probe of one-dimensional electron liquids}, journal = {Phys. Rev. B}, volume = {99}, number = {23}, year = {2019}, month = {JUN 11}, pages = {235124}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {Motivated by recent developments in the field of plasmonics, we develop the theory of radiation from one-dimensional electron liquids, showing that the spectrum of thermal radiation emitted from the system exhibits signatures of non-Fermi liquid behavior. We derive a multipole expansion for the radiation based on the Tomonaga-Luttinger liquid model. While the dipole radiation pattern is determined by the conductivity of the system, we demonstrate that the quadrupole radiation can reveal important features of the quantum liquid, such as the Luttinger parameter. Radiation offers a probe of the interactions of the system, including Mott physics as well as nonlinear Luttinger liquid behavior. We show that these effects can be probed in current experiments on effectively one-dimensional electron liquids, such as carbon nanotubes.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.99.235124}, author = {DeGottardi, Wade and Gullans, Michael J. and Hegde, Suraj and Vishveshwara, Smitha and Hafezi, Mohammad} } @article { ISI:000498896500003, title = {Tunable Quantum Beat of Single Photons Enabled by Nonlinear Nanophotonics}, journal = {Phys. Rev. Appl.}, volume = {12}, number = {5}, year = {2019}, month = {NOV 22}, pages = {054054}, publisher = {AMER PHYSICAL SOC}, type = {Article}, abstract = {We demonstrate the tunable quantum beat of single photons through the co-development of core nonlinear nanophotonic technologies for frequency-domain manipulation of quantum states in a common physical platform. Spontaneous four-wave mixing in a nonlinear resonator is used to produce nondegenerate, quantum-correlated photon pairs. One photon from each pair is then frequency shifted, without degradation of photon statistics, using four-wave-mixing Bragg scattering in a second nonlinear resonator. Fine tuning of the applied frequency shift enables tunable quantum interference of the two photons as they are impinged on a beam splitter, with an oscillating signature that depends on their frequency difference. Our work showcases the potential of nonlinear nanophotonic devices as a valuable resource for photonic quantum-information science.}, issn = {2331-7019}, doi = {10.1103/PhysRevApplied.12.054054}, author = {Li, Qing and Singh, Anshuman and Lu, Xiyuan and Lawall, John and Verma, Varun and Mirin, Richard and Nam, Sae Woo and Srinivasan, Kartik} } @article { ISI:000448933900004, title = {Collective Effects in Casimir-Polder Forces}, journal = {PHYSICAL REVIEW LETTERS}, volume = {121}, number = {18}, year = {2018}, month = {NOV 1}, pages = {183605}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.121.183605}, author = {Sinha, Kanupriya and Venkatesh, B. Prasanna and Meystre, Pierre} } @article { ISI:000425089500005, title = {High-precision measurements and theoretical calculations of indium excited-state polarizabilities}, journal = {PHYSICAL REVIEW A}, volume = {97}, number = {2}, year = {2018}, month = {FEB 15}, pages = {022507}, issn = {2469-9926}, doi = {10.1103/PhysRevA.97.022507}, author = {Vilas, N. B. and Wang, B. -Y. and Rupasinghe, P. M. and Maser, D. L. and Safronova, M. S. and Safronova, U. I. and Majumder, P. K.} } @article { ISI:000445503000001, title = {Microwave-activated controlled-Z gate for fixed-frequency fluxonium qubits}, journal = {PHYSICAL REVIEW A}, volume = {98}, number = {3}, year = {2018}, month = {SEP 24}, pages = {030301}, issn = {2469-9926}, doi = {10.1103/PhysRevA.98.030301}, author = {Nesterov, Konstantin N. and Pechenezhskiy, V, Ivan and Wang, Chen and Manucharyan, Vladimir E. and Vavilov, Maxim G.} } @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: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:000434633000006, title = {Probing Sizes and Shapes of Nobelium Isotopes by Laser Spectroscopy}, journal = {PHYSICAL REVIEW LETTERS}, volume = {120}, number = {23}, year = {2018}, month = {JUN 8}, pages = {232503}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.120.232503}, author = {Raeder, S. and Ackermann, D. and Backe, H. and Beerwerth, R. and Berengut, J. C. and Block, M. and Borschevsky, A. and Cheal, B. and Chhetri, P. and Duellmann, Ch. E. and Dzuba, V. A. and Eliav, E. and Even, J. and Ferrer, R. and flambaum, v. v. and Fritzsche, S. and Giacoppo, F. and Goetz, S. and Hessberger, F. P. and Huyse, M. and Kaldor, U. and Kaleja, O. and Khuyagbaatar, J. and Kunz, P. and Laatiaoui, M. and Lautenschlager, F. and Lauth, W. and Mistry, A. K. and Ramirez, E. Minaya and Nazarewicz, W. and Porsev, S. G. and Safronova, M. S. and Safronova, U. I. and Schuetrumpf, B. and Van Duppen, P. and Walther, T. and Wraith, C. and Yakushev, A.} } @article {9191, title = {Quantized Majorana conductance}, journal = {Nature}, volume = {Advanced Online Publication}, year = {2018}, month = {03/2018}, url = {http://dx.doi.org/10.1038/nature26142}, author = {Zhang, Hao and Liu, Chun-Xiao and Gazibegovic, Sasa and Xu, Di and Logan, John A. and Wang, Guanzhong and van Loo, Nick and Bommer, Jouri D. S. and de Moor, Michiel W. A. and Car, Diana and Op het Veld, Roy L. M. and van Veldhoven, Petrus J. and Koelling, Sebastian and Verheijen, Marcel A. and Pendharkar, Mihir and Pennachio, Daniel J. and Shojaei, Borzoyeh and Lee, Joon Sue and Palmstr{\o}m, Chris J. and Bakkers, Erik P. A. M. and S. Das Sarma and Kouwenhoven, Leo P.} } @article {ISI: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:000438196300002, title = {Topological band crossings in hexagonal materials}, journal = {PHYSICAL REVIEW MATERIALS}, volume = {2}, number = {7}, year = {2018}, month = {JUL 11}, pages = {074201}, issn = {2475-9953}, doi = {10.1103/PhysRevMaterials.2.074201}, author = {Zhang, J. and Chan, Y-H. and Chiu, C-K. and Vergniory, M. G. and Schoop, L. M. and Schnyder, A. P.} } @article { ISI:000439973300004, title = {Topological phases, edge modes, and the Hofstadter butterfly in coupled Su-Schrieffer-Heeger systems}, journal = {PHYSICAL REVIEW B}, volume = {98}, number = {2}, year = {2018}, month = {JUL 27}, pages = {024205}, issn = {2469-9950}, doi = {10.1103/PhysRevB.98.024205}, author = {Padavic, Karmela and Hegde, Suraj S. and DeGottardi, Wade and Vishveshwara, Smitha} } @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 { 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:000406382800003, title = {Methods, analysis, and the treatment of systematic errors for the electron electric dipole moment search in thorium monoxide}, journal = {NEW JOURNAL OF PHYSICS}, volume = {19}, year = {2017}, month = {JUL 25}, issn = {1367-2630}, doi = {10.1088/1367-2630/aa708e}, author = {Baron, J. and Campbell, W. C. and DeMille, D. and Doyle, J. M. and Gabrielse, G. and Gurevich, Y. V. and Hess, P. W. and Hutzler, N. R. and Kirilov, E. and Kozyryev, I. and O{\textquoteright}Leary, B. R. and Panda, C. D. and Parsons, M. F. and Spaun, B. and Vutha, A. C. and West, A. D. and West, E. P. and ACME Collaboration} } @article {6701, title = {Observation of a discrete time crystal}, journal = {Nature}, volume = {543}, year = {2017}, month = {03/2017}, pages = {217-220}, chapter = {217}, keywords = {ions, many-body localization, time crystal}, doi = {10.1038/nature21413}, author = {J Zhang and P W. Hess and A Kyprianidis and P Becker and A Lee and J Smith and G Pagano and I.-D Potirniche and A C. Potter and A Vishwanath and N Y. Yao and C Monroe} } @article {7376, title = {Quantum simulation of a Fermi{\textendash}Hubbard model using a semiconductor quantum dot array}, journal = {Nature}, volume = {548}, year = {2017}, month = {08/2017}, pages = {70{\textendash}73}, isbn = {0028-0836}, url = {http://dx.doi.org/10.1038/nature23022}, author = {Hensgens, T and Fujita, T and Janssen, L and Li, Xiao and Van Diepen, C J. and Reichl, C and Wegscheider, W and S. Das Sarma and Vandersypen, L M. K.} } @article { ISI:000372799400003, title = {Drumhead surface states and topological nodal-line fermions in TlTaSe2}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {12}, year = {2016}, month = {MAR 28}, issn = {2469-9950}, doi = {10.1103/PhysRevB.93.121113}, author = {Bian, Guang and Chang, Tay-Rong and Zheng, Hao and Velury, Saavanth and Xu, Su-Yang and Neupert, Titus and Chiu, Ching-Kai and Huang, Shin-Ming and Sanchez, Daniel S. and Belopolski, Ilya and Alidoust, Nasser and Chen, Peng-Jen and Chang, Guoqing and Bansil, Arun and Jeng, Horng-Tay and Lin, Hsin and Hasan, M. Zahid} } @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:000368483600011, title = {Effects of nonequilibrium quasiparticles in a thin-film superconducting microwave resonator under optical illumination}, journal = {PHYSICAL REVIEW B}, volume = {93}, number = {2}, year = {2016}, month = {JAN 19}, pages = {024514}, issn = {1098-0121}, doi = {10.1103/PhysRevB.93.024514}, author = {Budoyo, R. P. and Hertzberg, J. B. and Ballard, C. J. and Voigt, K. D. and Kim, Z. and Anderson, J. R. and Lobb, C. J. and Wellstood, F. C.} } @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 {4175, title = {Measurement of Topological Invariants in a 2D Photonic System}, journal = {Nature Photonics}, volume = {10}, year = {2016}, month = {02/2016}, pages = {180}, doi = {10.1038/nphoton.2016.10}, url = {http://www.nature.com/nphoton/journal/v10/n3/full/nphoton.2016.10.html}, author = {S Mittal and Ganeshan, S and Jingyun Fan and A Vaezi and Mohammad Hafezi} } @article {ISI: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: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.} } @conference { ISI:000354263300010, title = {Measuring the Propagation of Information and Entanglement in Dispersive Media}, booktitle = {SLOW LIGHT, FAST LIGHT, AND OPTO-ATOMIC PRECISION METROLOGY VIII}, series = {Proceedings of SPIE}, volume = {9378}, year = {2015}, note = {Conference on Slow Light, Fast Light, and Opto-Atomic Precision Metrology VIII, San Francisco, CA, FEB 08-12, 2015}, isbn = {978-1-62841-468-4}, issn = {0277-786X}, doi = {10.1117/12.2086776}, author = {Clark, Jeremy B. and Glasser, Ryan T. and Glorieux, Quentin and Vogl, Ulrich and Li, Tian and Jones, Kevin M. and Lett, Paul D.}, editor = {Shahriar, SM and Scheuer, J} } @article {2724, title = {Modular entanglement of atomic qubits using photons and phonons}, journal = {Nature Physics}, volume = {11}, year = {2015}, pages = {37}, doi = {10.1038/nphys3150}, url = {http://www.nature.com/nphys/journal/v11/n1/full/nphys3150.html}, author = {D Hucul and Inlek, I. V. and Vittorini, G. and Crocker, C. and Debnath, S. and Clark, S. M. and C. Monroe} } @article {ISI:000351362200012, title = {Movable Thin-Film Superconducting Resonator Coupled to a Tapered Optical Microfiber at 15 mK}, journal = {IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY}, volume = {25}, number = {3}, year = {2015}, month = {JUN}, pages = {1700305}, issn = {1051-8223}, doi = {10.1109/TASC.2014.2379628}, author = {Voigt, K. D. and Hertzberg, J. B. and Hoffman, J. E. and Grover, J. A. and Solano, P. and Budoyo, R. P. and Ballard, C. and Lee, J. and Anderson, J. R. and Lobb, C. J. and Orozco, L. A. and Rolston, S. L. and Wellstood, E. C.} } @article { ISI:000362894500004, title = {Nonuniversal weak antilocalization effect in cubic topological Kondo insulators}, journal = {PHYSICAL REVIEW B}, volume = {92}, number = {16}, year = {2015}, month = {OCT 14}, issn = {1098-0121}, doi = {10.1103/PhysRevB.92.165415}, author = {Dzero, Maxim and Vavilov, Maxim G. and Kechedzhi, Kostyantyn and Victor M Galitski} } @conference { ISI:000359481900003, title = {On-Chip Silicon Photonic Thermometers: from Waveguide Bragg Grating to Ring Resonators sensors}, booktitle = {ADVANCED ENVIRONMENTAL, CHEMICAL, AND BIOLOGICAL SENSING TECHNOLOGIES XII}, series = {Proceedings of SPIE}, volume = {9486}, year = {2015}, note = {Conference on Advanced Environmental, Chemical, and Biological Sensing Technologies XII, Baltimore, MD, APR 20-21, 2015}, isbn = {978-1-62841-602-2}, issn = {0277-786X}, doi = {10.1117/12.2176666}, author = {Klimov, Nikolai N. and Purdy, Thomas and Ahmed, Zeeshan}, editor = {VoDinh, T and Lieberman, RA and Gauglitz, GG} } @article { ISI:000352864700001, title = {Photon-efficient quantum key distribution using time-energy entanglement with high-dimensional encoding}, journal = {NEW JOURNAL OF PHYSICS}, volume = {17}, year = {2015}, month = {FEB 4}, issn = {1367-2630}, doi = {10.1088/1367-2630/17/2/022002}, author = {Zhong, Tian and Zhou, Hongchao and Horansky, Robert D. and Lee, Catherine and Verma, Varun B. and Lita, Adriana E. and Restelli, Alessandro and Bienfang, Joshua C. and Mirin, Richard P. and Gerrits, Thomas and Nam, Sae Woo and Marsili, Francesco and Shaw, Matthew D. and Zhang, Zheshen and Wang, Ligong and Englund, Dirk and Wornell, Gregory W. and Shapiro, Jeffrey H. and Wong, Franco N. C.} } @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:000330575300002, title = {Advanced quantum noise correlations}, journal = {NEW JOURNAL OF PHYSICS}, volume = {16}, year = {2014}, month = {JAN 10}, issn = {1367-2630}, doi = {10.1088/1367-2630/16/1/013011}, author = {Vogl, Ulrich and Ryan T Glasser and Clark, Jeremy B. and Quentin Glorieux and Li, Tian and Corzo, Neil V. and Paul D Lett} } @article { ISI:000332330900005, title = {Continuous all-optical deceleration and single-photon cooling of molecular beams}, journal = {PHYSICAL REVIEW A}, volume = {89}, number = {2}, year = {2014}, month = {FEB 21}, issn = {1050-2947}, doi = {10.1103/PhysRevA.89.023425}, author = {Jayich, A. M. and Vutha, A. C. and Hummon, M. T. and J V Porto and W. C. Campbell} } @article { ISI:000342151500005, title = {Cross Modulation of Two Laser Beams at the Individual-Photon Level}, journal = {PHYSICAL REVIEW LETTERS}, volume = {113}, number = {11}, year = {2014}, month = {SEP 12}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.113.113603}, author = {Beck, Kristin M. and Chen, Wenlan and Lin, Qian and Gullans, Michael and Lukin, Mikhail D. and Vuletic, Vladan} } @article {2723, title = {Entanglement of distinguishable quantum memories}, journal = {Phys. Rev. A}, volume = {90}, year = {2014}, month = {Oct}, pages = {040302}, doi = {10.1103/PhysRevA.90.040302}, url = {http://link.aps.org/doi/10.1103/PhysRevA.90.040302}, author = {Vittorini, G. and Hucul, D. and Inlek, I. V. and Crocker, C. and C. Monroe} } @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:000341456600024, title = {High-speed, high-purity separation of gold nanoparticle-DNA origami constructs using centrifugation}, journal = {SOFT MATTER}, volume = {10}, number = {37}, year = {2014}, pages = {7370-7378}, issn = {1744-683X}, doi = {10.1039/c4sm01071j}, author = {Ko, Seung Hyeon and Vargas-Lara, Fernando and Patrone, Paul N. and Stavis, Samuel M. and Starr, Francis W. and Douglas, Jack F. and Liddle, J. Alexander} } @article { ISI:000343769400004, title = {Kitaev Chains with Long-Range Pairing}, journal = {PHYSICAL REVIEW LETTERS}, volume = {113}, number = {15}, year = {2014}, month = {OCT 9}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.113.156402}, author = {Vodola, Davide and Lepori, Luca and Ercolessi, Elisa and Gorshkov, Alexey V. and Guido Pupillo} } @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: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 {2722, title = {Quantum gates with phase stability over space and time}, journal = {Phys. Rev. A}, volume = {90}, year = {2014}, month = {Oct}, pages = {042316}, doi = {10.1103/PhysRevA.90.042316}, url = {http://link.aps.org/doi/10.1103/PhysRevA.90.042316}, author = {Inlek, I. V. and Vittorini, G. and Hucul, D. and Crocker, C. and C. Monroe} } @article {2564, title = {Quantum mutual information of an entangled state propagating through a fast-light medium}, journal = {Nature Photonics}, year = {2014}, month = {5/2014}, doi = {10.1038/nphoton.2014.112}, author = {Jeremy B Clark and Ryan T Glasser and Quentin Glorieux and Vogl, Ulrich and Li, Tian and Kevin M Jones and Paul D Lett} } @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} } @conference { ISI:000355316301431, title = {Bipartite Quantum Correlations in a Fast-Light Medium Generated with Four-Wave-Mixing in Rubidium Vapour}, booktitle = {2013 CONFERENCE ON AND INTERNATIONAL QUANTUM ELECTRONICS CONFERENCE LASERS AND ELECTRO-OPTICS EUROPE (CLEO EUROPE/IQEC)}, year = {2013}, note = {Conference on Lasers and Electro-Optics Europe \& International Quantum Electronics Conference (CLEO/Europe-IQEC), Munich, GERMANY, MAY 12-16, 2013}, isbn = {978-1-4799-0594-2}, author = {Vogl, U. and Glasser, R. T. and Lett, P. D.} } @article { ISI:000313546100001, title = {Experimental characterization of Gaussian quantum discord generated by four-wave mixing}, journal = {Phys. Rev. A}, volume = {87}, number = {1}, year = {2013}, month = {JAN 16}, pages = {010101}, issn = {1050-2947}, doi = {10.1103/PhysRevA.87.010101}, author = {Vogl, Ulrich and Ryan T Glasser and Quentin Glorieux and Jeremy B Clark and N V Corso Trejo and Paul D Lett} } @conference { ISI:000326703000013, title = {A hybrid quantum system of atoms trapped on ultrathin optical fibers coupled to superconductors}, booktitle = {QUANTUM COMMUNICATIONS AND QUANTUM IMAGING XI}, series = {Proceedings of SPIE}, volume = {8875}, year = {2013}, note = {Conference on Quantum Communications and Quantum Imaging XI, San Diego, CA, AUG 26-29, 2013}, isbn = {978-0-8194-9725-3}, issn = {0277-786X}, doi = {10.1117/12.2024362}, author = {Rolston, S. L. and Anderson, J. R. and Chukwu, U. and Grover, J. and Hertzberg, J. B. and Hoffman, J. E. and Kordell, P. and Lee, J. and Lobb, C. J. and Orozco, L. A. and Ravets, S. and Solano, P. and Voigt, K. D. and Wellstood, F. C. and Wong-Campos, J. D. and Beadie, G. and Fatemi, F. K.}, editor = {Meyers, RE and Shih, Y and Deacon, KS} } @article { ISI:000321914700020, title = {Interlayer tunneling spectroscopy of graphite at high magnetic field oriented parallel to the layers}, journal = {EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS}, volume = {222}, number = {5}, year = {2013}, month = {JUL}, pages = {1257-1262}, issn = {1951-6355}, doi = {10.1140/epjst/e2013-01919-7}, author = {Latyshev, Y. I. and Orlov, A. P. and Monceau, P. and Vignolles, D. and Pershoguba, S. S. and Yakovenko, V. M.} } @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.} } @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:000309102300001, title = {Advanced detection of information in optical pulses with negative group velocity}, journal = {PHYSICAL REVIEW A}, volume = {86}, number = {3}, year = {2012}, month = {SEP 25}, issn = {1050-2947}, doi = {10.1103/PhysRevA.86.031806}, author = {Vogl, Ulrich and Glasser, Ryan T. and Lett, Paul D.} } @article {2409, title = {Precision Measurement of Transition Matrix Elements via Light Shift Cancellation}, journal = {Phys. Rev. Lett.}, volume = {109}, year = {2012}, month = {12/2012}, doi = {10.1103/PhysRevLett.109.243003}, author = {C. D. Herold and V. D. Vaidya and X. Li and Steven L Rolston and J V Porto and Marianna S Safronova} } @article {2543, title = {Quantum phases of hard-core bosons in a frustrated honeycomb lattice}, journal = {NEW JOURNAL OF PHYSICS}, volume = {14}, year = {2012}, month = {NOV 29}, pages = {115028}, issn = {1367-2630}, doi = {10.1088/1367-2630/14/11/115028}, author = {Varney, C. N. and Sun, K. and Victor M Galitski and Rigol, M.} } @article {2416, title = {Stimulated Generation of Superluminal Light Pulses via Four-Wave Mixing}, journal = {Phys. Rev. Lett.}, volume = {108}, year = {2012}, month = {4/2012}, pages = {173902}, doi = {10.1103/PhysRevLett.108.173902}, author = {Ryan T Glasser and Vogl, Ulrich and Paul D Lett} } @article {ISI:000296287300010, title = {Coalescence of Single Photons Emitted by Disparate Single-Photon Sources: The Example of InAs Quantum Dots and Parametric Down-Conversion Sources}, journal = {Phys. Rev. Lett.}, volume = {107}, number = {15}, year = {2011}, month = {oct}, pages = {157402}, abstract = {Single photons produced by fundamentally dissimilar physical processes will in general not be indistinguishable. We show how photons produced from a quantum dot and by parametric down-conversion in a nonlinear crystal can be manipulated to be indistinguishable. The measured two-photon coalescence probability is 16\%, and is limited by quantum-dot decoherence. Temporal filtering to the quantum-dot coherence time and accounting for detector time response increases this to 61\% while retaining 25\% of the events. This technique can connect different elements in a scalable quantum network.

}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.107.157402}, author = {Sergey V Polyakov and Andreas Muller and Flagg, Edward B. and Alexander Ling and Borjemscaia, Natalia and Edward Van Keuren and Alan L Migdall and Glenn S Solomon} } @article {Varney2011, title = {Kaleidoscope of Exotic Quantum Phases in a Frustrated XY Model}, journal = {Phys. Rev. Lett.}, volume = {107}, number = {7}, year = {2011}, month = {aug}, pages = {077201}, keywords = {Multiple JQI Affil., Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v107/i7/e077201}, author = {Varney, Christopher and Kai Sun and Victor M Galitski and Rigol, Marcos} } @article {Barnett2011a, title = {Prethermalization in quenched spinor condensates}, journal = {Phys. Rev. A}, volume = {84}, number = {2}, year = {2011}, month = {aug}, pages = {023606}, keywords = {2011}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v84/i2/e023606}, author = {Ryan Barnett and Anatoli Polkovnikov and Vengalattore, Mukund} } @article {Varney2011, title = {Publisher{\textquoteright}s Note: Kaleidoscope of Exotic Quantum Phases in a Frustrated XY Model [Phys. Rev. Lett. 107, 077201 (2011)]}, journal = {Phys. Rev. Lett.}, volume = {107}, number = {7}, year = {2011}, month = {aug}, pages = {077201}, keywords = {2011, Multiple JQI Affil., Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v107/i8/e089902 http://prl.aps.org/abstract/PRL/v107/i7/e077201}, author = {Varney, Christopher and Kai Sun and Victor M Galitski and Rigol, Marcos} } @article {Kim2011b, title = {Thin-film superconducting resonator tunable to the ground-state hyperfine splitting of 87Rb}, journal = {AIP Advances}, volume = {1}, number = {4}, year = {2011}, month = {oct}, pages = {042107}, keywords = {2011, electron beam lithography, ground states, inductance, Multiple Fellows, niobium, superconducting microwave devices, superconducting resonators, superconducting thin films, type II superconductors}, issn = {21583226}, url = {http://link.aip.org/link/?AAIDBI/1/042107/1}, author = {Kim, Z. and Vlahacos, C. P. and Jonathan E Hoffman and Grover, J. A. and Voigt, K. D. and Benjamin K Cooper and Ballard, C. J. and B S Palmer and Mohammad Hafezi and Jacob M Taylor and Jeffrey R Anderson and Dragt, A. J. and Christopher J Lobb and Luis A Orozco and Steven L Rolston and F C Wellstood} } @article {Varney2011a, title = {Topological phase transitions for interacting finite systems}, journal = {Phys. Rev. B}, volume = {84}, number = {24}, year = {2011}, month = {dec}, pages = {241105}, keywords = {2011, Multiple JQI Affil., Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v84/i24/e241105}, author = {Varney, Christopher and Kai Sun and Rigol, Marcos and Victor M Galitski} } @article {Varney2010, title = {Interaction effects and quantum phase transitions in topological insulators}, journal = {Phys. Rev. B}, volume = {82}, number = {11}, year = {2010}, month = {sep}, keywords = {2010, Multiple JQI Affil., Single Fellow}, issn = {1098-0121}, url = {http://prb.aps.org/abstract/PRB/v82/i11/e115125}, author = {Varney, Christopher and Kai Sun and Rigol, Marcos and Victor M Galitski} } @article { ISI:000276248900116, title = {Side jumps in the spin Hall effect: Construction of the Boltzmann collision integral}, journal = {PHYSICAL REVIEW B}, volume = {81}, number = {12}, year = {2010}, month = {MAR}, issn = {1098-0121}, doi = {10.1103/PhysRevB.81.125332}, author = {Culcer, Dimitrie and Hankiewicz, E. M. and Vignale, Giovanni and Winkler, R.} } @article { ISI:000286896100006, title = {Spectral and optical properties of doped graphene with charged impurities in the self-consistent Born approximation}, journal = {PHYSICAL REVIEW B}, volume = {82}, number = {24}, year = {2010}, month = {DEC 13}, issn = {1098-0121}, doi = {10.1103/PhysRevB.82.245418}, author = {de Juan, F. and Hwang, E. H. and Vozmediano, M. A. H.} } @article { ISI:000263389500057, title = {Giant Nernst Effect due to Fluctuating Cooper Pairs in Superconductors}, journal = {PHYSICAL REVIEW LETTERS}, volume = {102}, number = {6}, year = {2009}, month = {FEB 13}, issn = {0031-9007}, doi = {10.1103/PhysRevLett.102.067001}, author = {Serbyn, M. N. and Skvortsov, M. A. and Varlamov, A. A. and Victor M Galitski} } @article {Mathey2009c, title = {Noise correlations in low-dimensional systems of ultracold atoms}, journal = {Phys. Rev. A}, volume = {79}, number = {1}, year = {2009}, month = {jan}, pages = {14}, abstract = {We derive relations between standard order parameter correlations and the noise correlations in time of flight images, which are valid for systems with long range order as well as low dimensional systems with algebraic decay of correlations. Both Bosonic and Fermionic systems are considered. For one dimensional Fermi systems we show that the noise correlations are equally sensitive to spin, charge and pairing correlations and may be used to distinguish between fluctuations in the different channels. This is in contrast to linear response experiments, such as Bragg spectroscopy, which are only sensitive to fluctuations in the particle-hole channel (spin or charge). For Bosonic systems we find a sharp peak in the noise correlation at opposite momenta that signals pairing correlations in the depletion cloud. In a condensate with true long range order, this peak is a delta function and we can use Bogoliubov theory to study its temperature dependence. Interestingly we find that it is enhanced with temperature in the low temperature limit. In one dimensional condensates with only quasi-long range (i.e. power-law) order the peak in the noise correlations also broadens to a power-law singularity.}, keywords = {2009}, issn = {1050-2947}, url = {http://arxiv.org/abs/0810.1555}, author = {Ludwig Mathey and Vishwanath, A. and Altman, E.} } @article {Stanescu2009, title = {Topological insulators and metals in atomic optical lattices}, journal = {Phys. Rev. A}, volume = {79}, number = {5}, year = {2009}, month = {may}, pages = {053639}, keywords = {2009, CMAMO, Multiple Fellows}, issn = {1050-2947}, url = {http://pra.aps.org/abstract/PRA/v79/i5/e053639}, author = {Tudor D Stanescu and Victor M Galitski and J Vaishnav and Charles W Clark and S. Das Sarma} } @article {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 {Vaishnav2008, title = {Observing Zitterbewegung with Ultracold Atoms}, journal = {Phys. Rev. Lett.}, volume = {100}, number = {15}, year = {2008}, month = {apr}, keywords = {2008, Single Fellow}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v100/i15/e153002}, author = {J Vaishnav and Charles W Clark} } @article {Satija2008, title = {Physics of a two-dimensional electron gas with cold atoms in non-Abelian gauge potentials}, journal = {Phys. Rev. A}, volume = {77}, number = {4}, year = {2008}, month = {apr}, abstract = {Motivated by the possibility of creating non-Abelian fields using cold atoms in optical lattices, we explore the richness and complexity of non-interacting two-dimensional electron gases (2DEGs) in a lattice, subjected to such fields. In the continuum limit, a non-Abelian system characterized by a two-component "magnetic flux" describes a harmonic oscillator existing in two different charge states (mimicking a particle-hole pair) where the coupling between the states is determined by the non-Abelian parameter, namely the difference between the two components of the "magnetic flux." A key feature of the non-Abelian system is a splitting of the Landau energy levels, which broaden into bands, as the spectrum depends explicitly on the transverse momentum. These Landau bands result in a coarse-grained "moth," a continuum version of the generalized Hofstadter butterfly. Furthermore, the bands overlap, leading to effective relativistic effects. Importantly, similar features also characterize the corresponding two-dimensional lattice problem when at least one of the components of the magnetic flux is an irrational number. The lattice system with two competing "magnetic fluxes" penetrating the unit cell provides a rich environment in which to study localization phenomena. Some unique aspects of the transport properties of the non-Abelian system are the possibility of inducing localization by varying the quasimomentum, and the absence of localization of certain zero-energy states exhibiting a linear energy-momentum relation. Furthermore, non-Abelian systems provide an interesting localization scenario where the localization transition is accompanied by a transition from relativistic to non-relativistic theory.}, keywords = {2008, Single Fellow}, issn = {1050-2947}, url = {http://arxiv.org/abs/0711.2433}, author = {Indubala Satija and Dakin, Daniel and J Vaishnav and Charles W Clark} } @article {2474, title = {Spin Field Effect Transistors with Ultracold Atoms}, journal = {Phys. Rev. Lett.}, volume = {101}, year = {2008}, month = {12/2008}, pages = {265302}, doi = {10.1103/PhysRevLett.101.265302}, author = {J Vaishnav and Julius Ruseckas and Charles W Clark and Gediminas Juzeliunas} } @article {Helmerson2007a, title = {Generating persistent currents states of atoms using orbital angular momentum of photons}, journal = {Nuclear Physics A}, volume = {790}, number = {1-4}, year = {2007}, month = {jun}, pages = {705c{\textendash}712c}, keywords = {2007, Multiple Fellows}, issn = {03759474}, url = {http://adsabs.harvard.edu/abs/2007NuPhA.790..705H}, author = {Kristian Helmerson and Andersen, M.F. and Changhyun Ryu and Pierre Clad{\'e} and Vasant Natarajan and Alipasha Vaziri and William D Phillips} } @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 {Ryu2006, title = {High-order quantum resonances observed in a periodically kicked Bose-Einstein condensate}, journal = {Phys. Rev. Lett.}, volume = {96}, number = {16}, year = {2006}, month = {apr}, pages = {160403}, abstract = {We have observed high-order quantum resonances in a realization of the quantum delta-kicked rotor, using Bose-condensed Na atoms subjected to a pulsed standing wave of laser light. These resonances occur for pulse intervals that are rational fractions of the Talbot time, and are characterized by ballistic momentum transfer to the atoms. The condensate{\textquoteright}s narrow momentum distribution not only permits the observation of the quantum resonances at 3/4 and 1/3 of the Talbot time, but also allows us to study scaling laws for the resonance width in quasimomentum and pulse interval.}, keywords = {2006, Multiple Fellows}, issn = {0031-9007}, url = {http://www.ncbi.nlm.nih.gov/pubmed/16712208}, author = {Changhyun Ryu and Andersen, M.F. and Alipasha Vaziri and D{\textquoteright}Arcy, M B and Grossman, J M and Kristian Helmerson and William D Phillips} } @article {Andersen2006, title = {Quantized Rotation of Atoms from Photons with Orbital Angular Momentum}, journal = {Phys. Rev. Lett.}, volume = {97}, number = {17}, year = {2006}, pages = {170406}, keywords = {2006, Multiple Fellows}, issn = {0031-9007}, url = {http://prl.aps.org/abstract/PRL/v97/i17/e170406}, author = {Andersen, M.F. and Changhyun Ryu and Pierre Clad{\'e} and Vasant Natarajan and Alipasha Vaziri and Kristian Helmerson and William D Phillips} } @conference {Helmerson2006, title = {Rotating a Bose-Einstein condensate using photons with orbital angular momentum}, booktitle = {Proceedings of the SPIE}, volume = {6326}, number = {1}, year = {2006}, month = {aug}, pages = {632603{\textendash}632603{\textendash}9}, publisher = {SPIE}, organization = {SPIE}, keywords = {2006, Multiple Fellows}, issn = {0277786X}, url = {http://link.aip.org/link/?PSISDG/6326/632603/1}, author = {Kristian Helmerson and Andersen, M.F. and Changhyun Ryu and Pierre Clad{\'e} and Vasant Natarajan and Alipasha Vaziri and Hansen, Azure and William D Phillips} }