Bulletin of the American Physical Society
51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 65, Number 4
Monday–Friday, June 1–5, 2020; Portland, Oregon
Session D08: Simulation Techniques with Cold Atoms and IonsLive
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Chair: Giacomo Torlai, Flatiron Institute Room: Portland 255 |
Tuesday, June 2, 2020 2:00PM - 2:12PM Live |
D08.00001: Experiments on a Quantum Matter Synthesizer Jonathan Trisnadi, Minjiamei Zhang, Cheng Chin We report progress on the construction of a ``Quantum Matter Synthesizer,'' a new experimental platform which will have the capability to deterministically prepare two-dimensional arrays of ultracold atoms with single site addressability. Pre-cooled cesium atoms are first transferred into a science cell via a moving lattice, and then loaded into a magic-wavelength, far-detuned 2D optical lattice. The cell is centered between two microscope objectives for single-atom imaging and projecting of optical potentials onto the atom plane. The projected potentials include a 2D triangle lattice as well as a dynamic array of optical tweezers created by a digital micromirror device to arrange atoms into a desired configuration. We provide performance updates on the transport, trapping, and cooling of atoms at the microscope focus, as well details on our implementation of moving tweezer array [Preview Abstract] |
Tuesday, June 2, 2020 2:12PM - 2:24PM Live |
D08.00002: Interacting Su-Schrieffer-Heeger Chains Modeled in Optical Waveguides: Doublons, Edge States, and Transitions between them Helena Drueeke, Dieter Bauer Su-Schrieffer-Heeger (SSH) chains are finite, one-dimensional, periodic structures, and one of the simplest models for topological phase transitions. Often, they are realized experimentally by placing particles in magneto-optical traps. Instead, we consider experiments that implement the sites of the chain as optical waveguides and the particles as light coupled into them.\\ The behavior of two particles in one dimension is mathematically equivalent to that of a single particle in two dimensions. Therefore, in the waveguides, the light in a two-dimensional array of fibers models the behavior of two particles on a linear chain. The interaction between the particles can be tuned by modifying the refractive indices at certain sites in the two-dimensional pattern.\\ While the SSH model itself has a topological phase with edge states and a trivial phase without them, the interaction between two particles can cause doublon states. In those doublon states, the particles are at the same lattice site, even though their interaction is repulsive. We will present our tight-binding calculations of these states and the transitions between them. In the experiment, this corresponds to light switching between fibers in a bundle of waveguides. [Preview Abstract] |
Tuesday, June 2, 2020 2:24PM - 2:36PM Live |
D08.00003: Quantum Simulation of Turbulence with Cold Atoms Michael Forbes The flexibility of cold atom experiments allows them to be used as analogue quantum computers for modelling other physical systems. In this talk I will discuss how cold atoms can be used to simulate quantum turbulence, solving the dynamical quantum many-body problem in cases that exceed the capability of classical computation. The results of these simulations can thus be used to tune the density functional theories and hydrodynamic models, and I will discuss how these inform us about dynamics in nuclear systems, specially in neutron stars. [Preview Abstract] |
Tuesday, June 2, 2020 2:36PM - 2:48PM Live |
D08.00004: Realization of Multi-Level Magic Conditions in Polar Molecules for Quantum Simulations Qingze Guan, Ming Li, Svetlana Kotochigova Cold and ultracold molecules provide an ideal platform for realizing quantum computing and simulating condense matter systems. Taking advantage of the long-range dipole-dipole interactions, the rotational degrees of freedom of cold molecules trapped in optical lattice can be utilized to either simulate correlated many-body systems or construct entangled quantum qubits.To realize these systems, careful control of molecule-laser interactions for different rotational states is necessary. In this work, we theoretically study the dynamic polarizabilities of $^{87}\text{Rb}^{133}\text{Cs}$ molecule near the $b^3\Pi_0$ transition and explore its relevance in different quantum simulation scenarios. On the one hand, we find a frequency domain where a near ``triple magic'' condition exists among three rotational states which will enable to construct a synthetic lattice dimension with rotational excitations [1]. On the other hand, we study the periodic driving of the light shifts below and above the resonance for different rotational states which can be used for Floque engineering to mimic Hopf insulator [2]. [1] B. Sundar, B. Gadway, and K. Hazzard, Scientific Reports, 8:3422 (2018). [2] T. Schuster, F. Flicker, M. Li, S. Kotochigova, J. Moore, J. Ye, and N. Yao, arXiv:1901.08597. [Preview Abstract] |
Tuesday, June 2, 2020 2:48PM - 3:00PM Live |
D08.00005: All-optical neural network with nonlinear activation functions using cold atoms Ying Zuo, Bohan Li, Yujun Zhao, Yue Jiang, You-chiuan Chen, Peng Chen, Gyu-Boong Jo, Junwei Liu, Shengwang Du Most computer-based artificial neural networks with large number of neurons and interconnections require huge computational resources and power consumption. Optical implementation naturally has advantage with its intrinsic parallelism, high speed and low energy consumption. However, the experimental realization of all-optical nonlinear activation functions, which are necessary for deep machine learning, remains the bottleneck for optical neural networks. Here, we demonstrate a fully-functioned all-optical neural network (AONN) scheme with tunable linear optical operations and nonlinear optical activation functions. The linear operations are realized using spatial light modulators and optical Fourier lenses. The optical nonlinear activation functions are realized with electromagnetically induced transparency in a cold atomic ensemble. The AONN system is error-tolerant and scalable due to the independence of errors from different neurons. To verity the capability and feasibility of the AONN scheme, we built a two-layer dense AONN and successfully applied it to classify different phases for a prototypical Ising model in condensed matter physics. This work was supported by the Hong Kong Research Grants Council (Projects Nos. C6005-17G and ECS26302118). [Preview Abstract] |
Tuesday, June 2, 2020 3:00PM - 3:12PM Live |
D08.00006: Reduction of Spectral Method's Sampling Period Nontaphat Sinsunthithet, Sorawich Maichum, Narupon Chattrapiban, Jirayu Mongkolkiattichai Spectral method characterization of quantum transport of a neutral particle in an optical waveguide structure involves expensive computational resource. In this work we employ various series acceleration methods to reduce the time and space required for a computation of eigen-values from a spatio-temporal correlation. The investigation of the acceleration methods will be presented. [Preview Abstract] |
Tuesday, June 2, 2020 3:12PM - 3:24PM On Demand |
D08.00007: Observation of phase transitions in quantum Rabi model with single trapped ion Minglei Cai, Zidu Liu, Yukai Wu, Quanxin Mei, Yue Jiang, Wending Zhao, Xiang Zhang, Li He, Zichao Zhou, Luming Duan Quantum Rabi model is arguably the simplest light-matter interaction model involving only a two-level atom and a single-mode bosonic field. Rich quantum properties of this model have been explored both experimentally and theoretically. It has been shown recently that such simple system can even exhibit phase transitions which normally only occur in many-body interacting systems approaching thermodynamic limit. Here, we employ a single trapped ion to simulate the quantum Rabi Hamiltonian and find evidence of quantum phase transition through observing the corresponding order parameters. Furthermore, adding controllable dissipation to the coherent drive of the Rabi Hamiltonian, we construct an open quantum Rabi model and observe the dissipative phase transition through the qualitative change of average phonon number in the steady states. [Preview Abstract] |
Tuesday, June 2, 2020 3:24PM - 3:36PM Not Participating |
D08.00008: Quantum dynamics of multiple local phonons in a trapped-ion chain Ryutaro Ohira, Shota Kume, Kyoichi Takayama, Silpa Muralidharan, Kenji Toyoda We demonstrate a projective measurement for observing the dynamics of multiple local phonons in a trapped-ion chain. The probability amplitude of each local phonon is mapped to the auxiliary long-lived motional ground states. After the mapping process, sequential state-dependent fluorescence detection is performed. We also realize controlling the multiple local phonon dynamics by driving the Jaynes-Cummings interactions. [Preview Abstract] |
Tuesday, June 2, 2020 3:36PM - 3:48PM |
D08.00009: Tunable order for helically confined charges Peter Schmelcher, Ansgar Siemens We explore the formation of order for a system of long-range interacting particles on helices. The repulsive Coulomb interaction of equally charged particles acquires an oscillatory distance dependence when the particles are confined to a helix. This can lead to bound states and in particular to a plethora of distorted equilibrium configurations. Here we investigate the equilibria on a toroidal helix and report on a structural transition in the presence of an external electric field. While for zero field an amorphous-like particle ordering is observed the presence of a strong field leads to a crystalline order of the particles on the helix. The field allows to continuously tune between these distinct configuratons. Different system sizes are explored and relevant observables are analyzed. [Preview Abstract] |
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