@article { WOS:000655978400001,
title = {Programmable quantum simulations of spin systems with trapped ions},
journal = {Rev. Mod. Phys.},
volume = {93},
number = {2},
year = {2021},
month = {APR 7},
publisher = {AMER PHYSICAL SOC},
type = {Review},
abstract = {Laser-cooled and trapped atomic ions form an ideal standard for the simulation of interacting quantum spin models. Effective spins are represented by appropriate internal energy levels within each ion, and the spins can be measured with near-perfect efficiency using state-dependent fluorescence techniques. By applying optical fields that exert optical dipole forces on the ions, their Coulomb interaction can be modulated to produce long-range and tunable spin-spin interactions that can be reconfigured by shaping the spectrum and pattern of the laser fields in a prototypical example of a quantum simulator. Here the theoretical mapping of atomic ions to interacting spin systems, the preparation of complex equilibrium states, and the study of dynamical processes in these many-body interacting quantum systems are reviewed, and the use of this platform for optimization and other tasks is discussed. The use of such quantum simulators for studying spin models may inform our understanding of exotic quantum materials and shed light on the behavior of interacting quantum systems that cannot be modeled with conventional computers.},
issn = {0034-6861},
doi = {10.1103/RevModPhys.93.025001},
author = {Monroe, C. and Campbell, W. C. and Duan, L-M and Gong, Z-X and Gorshkov, V, A. and Hess, P. W. and Islam, R. and Kim, K. and Linke, N. M. and Pagano, G. and Richerme, P. and Senko, C. and Yao, N. Y.}
}
@article { WOS:000707419200012,
title = {Singularities in nearly uniform one-dimensional condensates due to quantum diffusion},
journal = {Phys. Rev. A},
volume = {104},
number = {4},
year = {2021},
month = {OCT 14},
publisher = {AMER PHYSICAL SOC},
type = {Article},
abstract = {Dissipative systems often exhibit wavelength-dependent loss rates. One prominent example is Rydberg polaritons formed by electromagnetically induced transparency, which have long been a leading candidate for studying the physics of interacting photons and also hold promise as a platform for quantum information. In this system, dissipation is in the form of quantum diffusion, i.e., proportional to k(2) (k being the wavevector) and vanishing at long wavelengths as k -> 0. Here, we show that one-dimensional condensates subject to this type of loss are unstable to long-wavelength density fluctuations in an unusual manner: after a prolonged period in which the condensate appears to relax to a uniform state, local depleted regions quickly form and spread ballistically throughout the system. We connect this behavior to the leading-order equation for the nearly uniform condensate-a dispersive analog to the Kardar-Parisi-Zhang equation-which develops singularities in finite time. Furthermore, we show that the wavefronts of the depleted regions are described by purely dissipative solitons within a pair of hydrodynamic equations, with no counterpart in lossless condensates. We close by discussing conditions under which such singularities and the resulting solitons can be physically realized.},
issn = {2469-9926},
doi = {10.1103/PhysRevA.104.L041303},
author = {Baldwin, C. L. and Bienias, P. and Gorshkov, V, A. and Gullans, M. J. and Maghrebi, M.}
}
@article { ISI:000564912400007,
title = {Coherent optical nanotweezers for ultracold atoms},
journal = {Phys. Rev. A},
volume = {102},
number = {1},
year = {2020},
month = {JUL 7},
pages = {013306},
publisher = {AMER PHYSICAL SOC},
type = {Article},
abstract = {There has been a recent surge of interest and progress in creating subwavelength free-space optical potentials for ultracold atoms. A key open question is whether geometric potentials, which are repulsive and ubiquitous in the creation of subwavelength free-space potentials, forbid the creation of narrow traps with long lifetimes. Here, we show that it is possible to create such traps. We propose two schemes for realizing subwavelength traps and demonstrate their superiority over existing proposals. We analyze the lifetime of atoms in such traps and show that long-lived bound states are possible. This work allows for subwavelength control and manipulation of ultracold matter, with applications in quantum chemistry and quantum simulation.},
issn = {2469-9926},
doi = {10.1103/PhysRevA.102.013306},
author = {Bienias, P. and Subhankar, S. and Wang, Y. and Tsui, T-C and Jendrzejewski, F. and Tiecke, T. and Juzeliunas, G. and Jiang, L. and Rolston, S. L. and Porto, V, J. and Gorshkov, V, A.}
}
@article {ISI:000469902700001,
title = {Interaction-induced transition in the quantum chaotic dynamics of a disordered metal},
journal = {Ann. Phys.},
volume = {405},
year = {2019},
month = {JUN},
pages = {1-13},
publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE},
type = {Article},
abstract = {We demonstrate that a weakly disordered metal with short-range interactions exhibits a transition in the quantum chaotic dynamics when changing the temperature or the interaction strength. For weak interactions, the system displays exponential growth of the out-of-time-ordered correlator (OTOC) of the current operator. The Lyapunov exponent of this growth is temperature-independent in the limit of vanishing interaction. With increasing the temperature or the interaction strength, the system undergoes a transition to a non-chaotic behaviour, for which the exponential growth of the OTOC is absent. We conjecture that the transition manifests itself in the quasiparticle energy-level statistics and also discuss ways of its explicit observation in cold-atom setups. (C) 2019 Elsevier Inc. All rights reserved.},
issn = {0003-4916},
doi = {10.1016/j.aop.2019.03.008},
author = {Syzranov, V, S. and Gorshkov, V, A. and Galitski, V. M.}
}