Bulletin of the American Physical Society
54th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 68, Number 7
Monday–Friday, June 5–9, 2023; Spokane, Washington
Session K02: Quantum Simulation with Large Spin Atoms and IonsInvited Live Streamed
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Chair: Ana Rey, JILA Room: Ballroom 111 A |
Wednesday, June 7, 2023 10:30AM - 11:00AM |
K02.00001: Quantum thermalization of long-range interacting spins Invited Speaker: Bruno Laburthe-Tolra Our goal is to define under which condition a long-range interacting quantum many-body system set out of equilibrium relaxes under the effect of interactions between its constituents. |
Wednesday, June 7, 2023 11:00AM - 11:30AM |
K02.00002: Quantum Computation of Hydrogen Bond Dynamics and Vibrational Spectra Invited Speaker: Philip Richerme Calculating observable properties of quantum chemical systems is a promising application of quantum computers. While most quantum algorithms and experimental demonstrations to date have focused on calculations of electronic structure in molecules, we have recently developed a protocol to study nuclear dynamics processes as well. In this talk, I will describe experiments which use the QSCOUT and IonQ trapped-ion quantum computers to emulate the quantum dynamics and vibrational properties of hydrogen-bonded systems. In our approach, we first treat the proton dynamics as a reduced-dimensional problem on a discretized lattice, then map its Hamiltonian to a sequence of quantum gate operations. Next, we implement these quantum gates on an ion-trap quantum computer to simulate how the proton wavepacket evolves due to the surrounding nuclear framework and electronic potential. Finally, we extract the characteristic vibrational frequencies for the proton motion using the experimentally-simulated dynamics. Our approach offers a new paradigm for simulating quantum dynamics and for computing accurate expectations values, opening the potential to study a range of chemical systems which are otherwise intractable. |
Wednesday, June 7, 2023 11:30AM - 12:00PM |
K02.00003: Scalable spin squeezing using multilevel atoms in an optical cavity Invited Speaker: Bhuvanesh Sundar Ultracold atoms in optical cavity setups are promising candidates for the creation of metrologically useful entangled states. Up to date, however, most of the effort has been restricted to atomic systems that use two relevant internal levels to encode a spin-1/2 degree of freedom. Here, we report on expanded opportunities for entanglement generation offered by multilevel atoms in cavities using two complementary protocols. In the first, we describe how to prepare two-mode squeezed states via near-unitary cavity-mediated spin-exchange interactions between atoms featuring four relevant internal levels. We find that the squeezing is scalable and robust to intrinsic experimental decoherence and can be easily exploited for metrology by mapping a conventional Ramsey sequence to our four-level system. In the second protocol, we demonstrate how dissipative relaxation to a dark state in multilevel atoms can enable the preparation of entangled states with up to four different squeezed quadratures, and how the squeezing is scalable. These ideas open new directions for quantum-enhanced sensing through the manipulation of cavity mediated interactions in multi-level atoms. |
Wednesday, June 7, 2023 12:00PM - 12:30PM |
K02.00004: Quantum Simulations and Computations with Ion Trap Systems Invited Speaker: Christopher R Monroe Ion trap quantum computer systems have essentially perfect idle coherence properties with fully-connected and reconfigurable gate operations. The frontiers of this platform have thus expanded from the physics of qubits and gates to the engineering of optical control signals, the efficient compilation of quantum gates, the mitigation of errors in software [1], and demonstrations of algorithms and quantum simulations that touch many areas of science. I will present recent results in all of these fronts with state-of-the-art ion trap quantum computer systems and simulators, from both the Duke Quantum Center and IonQ, Inc. This includes the highest fidelities observed in a many-qubit system [2], a newly discovered scheme for single-step many-qubit gates [3], simulations of exotic phases of magnetism [4], and the outlook for further scaling of ion trap quantum computers based on a well-defined and modular architecture. |
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