Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session F33: Quantum Simulation IFocus Recordings Available
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Sponsoring Units: DAMOP Chair: Eduardo Ibarra Garcia Padilla, Rice Univ Room: McCormick Place W-192C |
Tuesday, March 15, 2022 8:00AM - 8:12AM |
F33.00001: Interacting Quantum Matter with Rydberg-atom Synthetic Dimensions Sohail Dasgupta, Kaden R Hazzard Synthetic dimension platforms offer new unique ways of exploring quantum matter. Building on the recent success from collaborators in building a synthetic lattice of six Rydberg states on a single atom using ultracold 84Sr atoms (arXiv:2101.02871), we study the many-body physics that occurs when atoms with internal synthetic lattices are loaded in microtraps. These interact via strong dipole-dipole flip-flop interactions, giving rise to a novel system exhibiting unique properties. Theoretical studies on a special case of this system, with equal synthetic tunnelings and uniform nearest neighbor flip-flop interactions between adjacent synthetic sites, reveal phase transition into string-like states for certain interaction strengths. With the synthetic dimension build from Rydberg states, the interactions are non-local and site-dependent. In this talk, we discuss the ground state and finite temperature properties of this system. We also discuss possibilities of exploring other kinds of systems with this platform such as having a different tunneling scheme in the synthetic dimension. |
Tuesday, March 15, 2022 8:12AM - 8:24AM |
F33.00002: A hyperspherical approach to dipolar droplets Eli J Halperin, John L Bohn We apply a hyperspherical formulation to a dipolar Bose-Einstein condensate. Central to this approach is a general correspondence between K-harmonic hyperspherical methods and a suitable Gaussian ansatz to the Gross-Pitaevskii equation, regardless of the form of the interparticle potential. In the case of the dipolar Bose-Einstein condensate, this motivates the inclusion of a beyond-mean field term within the hyperspherical picture, which allows us to describe the energies and wavefunctions of excitations of self-bound dipolar droplets outside of the mean-field limit. This approach provides a regime for exploring transitions between the liquid and gas phases. |
Tuesday, March 15, 2022 8:24AM - 8:36AM Withdrawn |
F33.00003: An impurity in a heteronuclear two-component Bose mixture Giacomo Bighin We study the fate of an impurity in an ultracold heteronuclear Bose mixture, focusing on the experimentally relevant case of a 41K-87Rb mixture, with the impurity in a 41K hyperfine state. Our work provides a comprehensive description of an impurity in a BEC mixture with contact interactions across its phase diagram. We present results for the miscible and immiscible regimes, as well as for the impurity in a self-bound quantum droplet. Here, varying the interactions, we find novel, exotic states where the impurity localizes either at the center or at the surface of the droplet. |
Tuesday, March 15, 2022 8:36AM - 8:48AM |
F33.00004: Angular and radial density-density correlation function in a (2+1)-dimensional sonic black hole in ultra cold Bose-Einstein condensates and entanglement measure between the Hawking pairs : Inderpreet Kaur and Sankalpa Ghosh Sankalpa Ghosh, Inderpreet Kaur A quasi two-dimensional sonic black-hole scenario where an ultra cold atomic Bose-Einstein condensate (BEC) flows through an annular ring-shaped supersonic-subsonic interface is considered [1]. We verify the existence of entanglement between the analogue Hawking pairs that emerges from the quantum character of the spontaneous Hawking radiation emitted from such configurations [2].We considered number of quasi-two dimensional cases that include spin-orbit coupled (SOC) BEC [1] as well as quasi two-dimensional BEC without any internal degrees of freedom and compare our results with the typical quasi one-dimensional sonic black hole configurations.We studied in detail the radial and angular density-density correlations in such quasi two diemsnional systems. We also assess the participation of the phonon and the non-phononic part of the collective excitation spectrum [3] in the entanglement measure. |
Tuesday, March 15, 2022 8:48AM - 9:00AM |
F33.00005: Fully fluctuating simulation of quantized vortices in rotating Bose Einstein Condensates at finite temperature Kimberlee Keithley, Glenn H Fredrickson, Kris T Delaney We investigate structures of quantized vortices in samples of rotating Bose-Einstein condensates (BECs) of interacting particles at finite temperature in three dimensions using approximation-free field-theoretic simulations conducted with complex Langevin sampling. Most previous studies of such systems have been limited to mean field and zero-temperature analysis. Exact particle-based simulations at finite temperature, such as path integral Monte Carlo, are limited in the study of such systems due to the complex nature of the action. We present vortex structures in fully fluctuating simulations at finite temperature and investigate their relative stability as a function of temperature and rotational velocity. We also compare our results to those obtained with the static Gross-Pitaevskii equation, a mean field approximation that is often used in numerical studies of rotating dilute BECs. |
Tuesday, March 15, 2022 9:00AM - 9:12AM |
F33.00006: Symmetry-protected Bose-Einstein condensation of interacting hardcore Bosons Sebastian Paeckel, Thomas Köhler, Felix Alexander A Palm, Reja H Wilke The past two decades have seen the raise of practical applications of exotic quantum many-body phases. Proving their potential to overcome classical solution strategies to relevant problem settings, one of the main obstacles nowadays is to stabilize these highly fragile quantum states against perturbations. Here, we demonstrate the stabilization of a one-dimensional quantum many-body phase, characterized by a certain wave vector k, from a k-modulated coupling to a center site via the protection of an emergent Z2 symmetry. We illustrate this mechanism by constructing the solution to the full quantum many-body problem of hardcore bosons on a wheel geometry, which is known to form a BEC. The crucial step is to map the wheel to a projected ladder geometry, where the protection of the Z2 symmetry is manifested by the choice of a particular k mode spanning the projected subspace on one leg of the ladder. The robustness of the BEC is shown numerically by adding local interactions to the wheel Hamiltonian and we identify the energy scale that controls the protection of the emergent Z2 symmetry. Since the protection is generated by gapping out an independently selectable k mode from the single-particle spectrum, our findings can be generalized, for instance to create a k≠0 BEC. |
Tuesday, March 15, 2022 9:12AM - 9:48AM |
F33.00007: Topological and fracton order in Rydberg atom arrays Invited Speaker: Ruben Verresen Theoretical studies over the past decades have unearthed a rich picture of strongly-interacting quantum states of matter with exotic order. These highly-entangled states are interesting, both at a conceptual level, as well as a tool for quantum metrology or quantum computation purposes. However, their experimental realization and detection has proven to be challenging. In this talk, I will review some of our proposals for realizing these states in Rydberg atom tweezer arrays. The ability to control individual atoms---strongly-interacting over a wide distance---make these arrays an ideal platform for realizing exotic many-body quantum states, whose nonlocal order parameters can be probed by imaging the whole array. We will explore the whole spectrum of short- and long-range entanglement: from symmetry-protected topological phases, over cat states, to intrinsic topological order and even 3D fracton states. |
Tuesday, March 15, 2022 9:48AM - 10:00AM |
F33.00008: Asymmetric Tunneling of Bose-Einstein Condensates Dustin R Lindberg, Naceur Gaaloul, Jason Williams, Dennis Schlippert, Patrick B Boegel, Ernst M Rasel, Denys I Bondar In his celebrated textbook, Quantum Mechanics-Nonrelativistic Theory, Landau argued that, for single particle systems in 1D, tunneling probability remains the same for a particle incident from the left or the right of a barrier regardless of the shape of that potential barrier. We present a proof of this argument, as no rigorous proof currently exists. We then computationally show breaking of the left-right tunneling symmetry for Bose-Einstein condensates (BEC) in 1D, modeled by the Gross-Pitaevskii equation. By varying the parameter, g, of inter-particle interaction in the BEC, we demonstrate the transition from symmetric (g=0) to asymmetric tunneling is a threshold phenomenon. Our computations employ experimentally feasible parameters such that these results may be experimentally demonstrated in the near future. We conclude by suggesting applications of the phenomena to design atomtronic diodes, synthetic gauge fields, and black-hole analogues. |
Tuesday, March 15, 2022 10:00AM - 10:12AM |
F33.00009: Three-Dimensional Numerical Simulations of BEC Transport Using Shortcuts to Adiabaticity Christopher J Larson We report on our numerical simulations of high-fidelity, fast quantum control of Bose-Einstein condensates (BECs) as we extend them to full 3D solutions of the Gross-Pitaevskii equation. We simulate a 3D painted potential that provides complete confinement of the atoms. Painted potentials allow for arbitrary and dynamic traps, which control the spatial transport of the BEC. To achieve high quantum fidelity after transport, we implement shortcuts-to-adiabaticity (STAs) to design the BEC trajectory in our simulations. STAs allow fast movement while suppressing excitations that can result due to the rapid transitions of the quantum state. In our 3D simulations, quantum fidelities resulting from different, experimentally viable transport times and trap depths are compared. Using the measured frequencies of the different traps and by simulating transport over multiples of those periods, we seek to identify and analyze a possible cause of lower than expected post-transport fidelities. |
Tuesday, March 15, 2022 10:12AM - 10:24AM |
F33.00010: The kaleidoscope of phases in one-dimensional Rydberg dressed Fermi gases Junhyun Lee, Pavel A Volkov, Brian DeSalvo, Jedediah H Pixley We theoretically investigate the ground state phases of a Rydberg-dressed Fermi gas in a one-dimensional optical lattice. The asymptotic low energy behavior of the system is calculated with bosonization (for weak interactions) and a strong coupling expansion (for strong Rydberg dressing), and both are verified with density matrix renormalization group calculations. The dressed Rydberg system has an attractive backscattering interaction for a certain momentum range, which can be directly controlled by tuning the filling. This results in quasi-long range ordered phases alternating as a function of fermion density, when the interaction is weak. In contrast, the strong interactions are governed by the commensurate charge-density wave states, similar to the PXP-model in Rydberg systems. We present the phase diagram interpolating both limits, and discuss the experimental implications. |
Tuesday, March 15, 2022 10:24AM - 10:36AM |
F33.00011: Domain wall dynamics in Bose-Einstein condensates with density-dependent gauge field Kai-Xuan Yao, Zhendong Zhang, Cheng Chin We investigate the formation and dynamics of domain walls in a Bose-Einstein condensate under a density-dependent gauge field. The density-dependent gauge field is created by simultaneous modulations of an optical lattice potential and interatomic interactions, and results in domains of atoms condensed into two different momenta. We observe deterministic formation of domain walls due to the density inhomogeneity of the atomic cloud. We further study the dynamics of the domain walls under a synthetic electric field. Modeling the topological defects as elementary excitations, we find that they respond to the electric field with an effective charge-to-mass ratio larger than and opposite to that of the bare atoms. |
Tuesday, March 15, 2022 10:36AM - 10:48AM |
F33.00012: Finite momentum condensate with p-wave interaction Mingyang Liu, Shizhong Zhang A system of “spin-½” bosons with p-wave interaction can be a promising candidate for realizing a fragmented Bose-Einstein condensate known as the KSA state. In this talk, I show that the KSA state has lower energy than the standard condensate states that is explored so far in literature. Furthermore, I investigate the elementary excitations of the KSA state. Importance of the role of effective range will be emphasized in the talk. |
Tuesday, March 15, 2022 10:48AM - 11:00AM |
F33.00013: Deep Learning framework towards automated experiments and quantum simulations Ayana Ghosh, Bobby G Sumpter, Ondrej Dyck, Sergei V Kalinin, Maxim Ziatdinov Datasets with natural images where availability of thousands of samples with large variabilities are present, common deep learning (DL) classification strategies work well. However, for datasets consisting atomically resolved images, networks are required to rapidly adapt to changes to imaging conditions and successfully locate features (nearly identical objects) to make the analyses efficient. The differences in experimental and simulation parameters lead to out-of-distribution drifts. This work introduces DL workflow of ensemble learning and iterative training (ELIT) as an alternative strategy to surpass such challenges. The EL allows for selection of artifact-free features and pixel-wise uncertainty maps by combining multiple networks. The IT part retrains the networks with already realized features, focusing its attention on features present in the data. The features are then used to construct simulation objects to perform first-principles simulations for geometry optimization, property evaluation and temperature-dependent dynamics. Overall, these workflows may be used to better guide experiments while learning from theoretical models. |
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