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 M04: Focus Session: Rydberg Atom Array Experiments at the Complexity FrontierFocus Live Streamed
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Chair: Vincent Liu, University of Pittsburgh Room: Conference Theater |
Wednesday, June 7, 2023 2:00PM - 2:30PM |
M04.00001: Quantum Optimization with Rydberg Atom Arrays beyond Unit Disk Graphs Invited Speaker: Hannes Pichler Programmable quantum systems based on Rydberg atom arrays are a promising platform for tests of quantum optimization algorithms with hundreds of qubits. In particular, the maximum independent set problem on so-called unit-disk graphs has a natural realization in such systems. In this talk I discuss strategies to extend the classes of problems that can be effciently encoded in Rydberg arrays by constructing explicit mappings from several generic optimization problems to maximum weighted independent set problems on unit-disk graphs, with at most a quadratic overhead in the number of qubits. This includes: maximum weighted independent set on graphs with arbitrary connectivity, quadratic unconstrained binary optimization problems with arbitrary connectivity, and integer factorization formulated as an optimization problem. This provides a blueprint for using Rydberg atom arrays to solve a wide range of combinatorial optimization problems with arbitrary connectivity. |
Wednesday, June 7, 2023 2:30PM - 3:00PM |
M04.00002: Towards new frontiers of quantum science with dual-species atom arrays Invited Speaker: Giulia Semeghini
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Wednesday, June 7, 2023 3:00PM - 3:12PM |
M04.00003: Towards explorations of Rydberg synthetic dimensions in potassium atom tweezer arrays Chenxi Huang, Tao Chen, Ivan Velkovsky, Jacob Covey, Bryce Gadway Neutral atoms in optical tweezer arrays are a promising platform for analog quantum simulation and quantum information science. Here we present progress towards a controllable quantum simulator based on the engineering of synthetic dimensions in the Rydberg states of potassium atoms trapped in optical tweezer arrays. In one-dimensional tweezer arrays, we demonstrate efficient loading and cooling of potassium atoms down to 4 uK based on molasses cooling in 0.25 mK traps followed by adiabatic trap depth ramping to 40 uK, and we show evidence of coherent two-photon excitation of the atoms from their atomic ground state to Rydberg states with n = 62. We further explore the engineering of a synthetic dimension spanned by the internal Rydberg levels of the atoms, controlled directly by a tunable spectrum of applied microwaves. This unique platform is expected to host new many-body phases associated with the competition between dipolar Rydberg-Rydberg interactions and microwave-driven hopping in the synthetic dimension. |
Wednesday, June 7, 2023 3:12PM - 3:24PM |
M04.00004: Two-dimensional dipolar XY magnetism in thermal equilibrium Lode C Pollet, Björn Sbierski Motivated by a recent experiment on a square-lattice Rydberg atom array realizing a long-range dipolar XY model [Chen et al., arxiv:2207.12930], we numerically study the model's equilibrium properties. We obtain the phase diagram, critical properties, entropies and site-resolved correlation functions. We consider both ferromagnetic and antiferromagnetic interactions and apply quantum Monte Carlo and the pseudo-Majorana functional renormalization group. Our simulations quantitatively reproduce the experimentally measured spatial decay of correlations with only temperature as a tuning parameter and thus provide a thermometry protocol. Surprisingly, the entropies extracted for both signs of the coupling turn out to be rather high, ~0.7 log 2, calling for an investigation into possibly non-adiabatic heating sources in the experiment. |
Wednesday, June 7, 2023 3:24PM - 3:36PM |
M04.00005: Extended local error correction of the maximum independent set solutions obtained by Rydberg-atom experiments JuYoung Park, Jaewook Ahn In recent years, finding the solutions of the maximum independent set problem (MIS) by Rydberg-atom experiments has drawn keen interest [1,2], being expected to achieve a sub-exponential, efficient computation of the MIS problem in the NP class of computational complexity. However, experimental solution errors remain, being attributed to the current level of environmental noise and systematic errors, while they are partially corrected either by a greedy local error correction algorithm [1] or the most-likelihood estimation [2]. Here, we combine the above two correction methods to consider an extended local error correction which utilizes a small-scale lookup database of most-likelihood estimations. A preliminary result shows that, with the new method, MIS solutions are retrievable over 10% probability from possible experimental MIS solutions under the assumption of even up to 40% bitflip error probability, surpassing the under 4% retrieval probability of previous demonstrations. In conclusion, Rydberg atom experiments for the MIS problem could be improved by the presented extended local correction method to be of an accuracy mainly limited by the algorithmic efficiency and power of classical computation. |
Wednesday, June 7, 2023 3:36PM - 3:48PM |
M04.00006: QRydDemo – A quantum computer demonstrator with Rydberg atoms Florian Meinert, Philipp Ilzhöfer, Govind Unnikrishnan, Ratnesh K Gupta, Jiachen Zhao, Christian Hölzl, Achim Scholz, Jennifer Krauter, Hans Peter Büchler, Simone Montangero, Juergen Stuhler, Tilman Pfau I will present the status of our endeavor to set up a quantum computer demonstrator with Strontium Rydberg atoms. We will investigate a so far unexplored fine-structure qubit encoded in the 3P0-3P2 states of 88Sr. This qubit promises rapid single- and two-qubit gate times and features a triple-magic wavelength, for which the qubit states and the Rydberg state experience the same trapping potential. We work towards combining this qubit with an optical tweezer architecture allowing for shuffling operations within the qubit coherence time. Besides the status of setting up the experiment, I will briefly talk about the software stacks developed to allow access to the future quantum computer. |
Wednesday, June 7, 2023 3:48PM - 4:00PM |
M04.00007: Floquet engineering of Rydberg interactions Michael Dao Kang Lee, Luheng Zhao, Mohammad Mujahid Aliyu, Krishna Chaitanya Yellapragada, Huanqian Loh Single Rydberg atoms trapped in a programmable array of optical tweezers are an emerging platform to simulate spin Hamiltonians and implement quantum gates. Much of the programmability so far comes from the precise positioning of atoms. Here we enhance the versatility of the platform through Floquet driving, which allows us to realize Rydberg blockade, facilitation, and population trapping under unusual conditions. We describe the experimental setup used to realize Floquet driving, along with a detailed characterization of various experimental parameters that enable us to independently model the observed dynamical behavior of the atoms under Floquet driving. We show that Floquet driving is a simple and robust technique that allows us to access new regimes of Rydberg interactions, which will in turn pave the path for versatile quantum gate schemes, an improved range of entanglement, and quantum state engineering. |
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