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 S04: Focus Session: Advances in the Control of Rydberg Atom ArraysFocus Live Streamed
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Chair: Jacob Covey, UIUC Room: Conference Theater |
Thursday, June 8, 2023 10:30AM - 11:00AM |
S04.00001: Quantum programming of non-deterministic polynomial-time problems with Rydberg atom graphs Invited Speaker: Jaewook Ahn Currently there are growing interests in using Rydberg atom graphs for quantum computing of classically intractable problems, for example, the non-deterministic polynomial-time (NP) problems. It has been identified some NP problems are easily implementable with intrinsic Hamiltonians of interacting Rydberg atoms, of which atom arrangements define the problems in such a way that their solutions are compilable from the ground states of the Rydberg many-body Hamiltonians [1]. In the presentation, we first review our recent Rydberg-atom experiments performed for one of the NP-complete problems, the Maximum Independent Set (MIS) problem, in which we have investigated the MIS solutions of planar and nonplanar graphs implemented with atoms used as data qubits and quantum wires [2,3], and then we report new experimental efforts towards Rydberg-atom programming of other NP and NP-complete problems such as the 3-Satisfiability [4] and prime-number factorization problems. |
Thursday, June 8, 2023 11:00AM - 11:30AM |
S04.00002: An enhanced toolbox for larger and more versatile Rydberg atom arrays Invited Speaker: Huanqian Loh Scalable and programmable Rydberg atom arrays are a promising platform for quantum simulation and quantum information processing. In this talk, we report on our work to scale up and enhance the programmability of Rydberg atom arrays. We first demonstrate the realization of defect-free arrays of up to 225 atoms using efficient atom-sorting algorithms based on multiple optical tweezers moving simultaneously. Next, we examine a building block of the platform comprising two atoms. By applying a Floquet drive to the atoms, we encounter several regimes of counterintuitive behavior unlike those usually accessed with a static Hamiltonian. For instance, we show that Rydberg blockade can be experienced by two atoms spaced farther than the static blockade radius. Further, the Floquet driving enables state-dependent population trapping and enhances the tunability between Rydberg blockade and anti-blockade. The presented techniques enrich the toolbox for controlling Rydberg atom arrays and open up possibilities for large-scale quantum simulations and new quantum information protocols. |
Thursday, June 8, 2023 11:30AM - 11:42AM |
S04.00003: Narrow-line imaging of single strontium atoms in shallow optical tweezers Alexander Urech, Ivo Knottnerus, Yu Chih Tseng, Robert J C Spreeuw, Florian Schreck Single strontium atoms held in optical tweezers have so far only been imaged using the |
Thursday, June 8, 2023 11:42AM - 11:54AM |
S04.00004: Efficient algorithms to solve atom reconfiguration problems Remy El Sabeh, Izzat El Hajj, Naomi Nishimura, Amer E Mouawad, Alexandre Cooper-Roy Configurations of neutral atoms individually trapped in tightly-focused laser beams, aka tweezer arrays, provide a versatile platform to realize quantum spin models with programmable spatial geometries. Assembling large configurations of atoms by displacing atoms using dynamic optical traps requires solving atom reconfiguration problems. In this talk, I will describe two heuristic algorithms to solve atom reconfiguration problems [1, 2], as well as a low-latency feedback system to implement these algorithms. I will then benchmark the operational performance of the algorithms against exact and approximate algorithms, as well as the runtime performance of the low-latency reconfiguration system. I will finally discuss the experimental challenges of scaling up beyond a few thousand atoms. These results address the scalability challenge of atom-based platforms towards realizing quantum simulation of real materials with a practical quantum advantage. |
Thursday, June 8, 2023 11:54AM - 12:06PM |
S04.00005: Randomized Benchmarking Using Non-Destructive Readout Boyko Nikolov, Elliot Diamond-Hitchcock, Jonathan Bass, Nicholas Spong, Jonathan D Pritchard Holographically generated arrays of Rydberg atoms have emerged as a competitive, highly scalable platform for quantum computing and simulation. While gate operation fidelities have improved significantly in recent years, state detection methods require further attention. Current experiments typically read out the state of the qubits by inducing state-selective atom loss and are therefore unable to distinguish different loss mechanisms. Furthermore, this destructive detection method is incompatible with repetitive error correction algorithms and necessitates re-loading of atoms on every experimental cycle. |
Thursday, June 8, 2023 12:06PM - 12:18PM |
S04.00006: Neutral atoms in tweezer arrays for hybrid Rydberg quantum computing Zhichao Guo, Deon Janse van Rensburg, Rik van Herk, Marijn Venderbosch, Ivo Knottnerus, Alexander Urech, Yu-Chih Tseng, Robert De Keijzer, Madhav Mohan, Jasper Postema, Robert J C Spreeuw, Florian Schreck, Rianne Lous, Edgar Vredenbregt, Servaas Kokkelmans Our project aims to build a quantum co-processor for hybrid quantum computing, with online access via the Quantum Inspire platform of QuantumDelta NL. The co-processor is made of strontium atoms in a 2D optical tweezer array generated by a spatial light modulator. High-fidelity single-qubit control is achieved by laser coupling to the clock transition and for two- and multi-qubit gates using Rydberg excitations to control the interactions between different tweezer sites. The co-processor will be able to solve problems in quantum chemistry using pulsed-based quantum optimization algorithms. We report on the experimental progress and features of the new strontium machine. Furthermore, we discuss our approach to extend the scalability, addressability, and parallelizability of the number of qubits and qubit operations of the platform. |
Thursday, June 8, 2023 12:18PM - 12:30PM |
S04.00007: Nuclear spin qubits encoded in the metastable state of neutral 171Yb atoms Genyue Liu, Shuo Ma, Pai Peng, Bichen Zhang, Jeff D Thompson Neutral atom qubits in optical tweezer arrays is a rapidly advancing field in quantum science. 171Yb has several unique advantages including a highly coherent nuclear spin with I=1/2, and versatile controllability [1, 2]. In this talk, we present ongoing work to implement qubits encoded in the nuclear spin sublevels of the metastable 3P0 electronic state. This allows fast, single-photon Rydberg excitation and a path towards low-overhead fault-tolerant quantum computing based on erasure conversion [3]. We demonstrate a novel approach to fast, high-fidelity initialization and readout from 3P0 that does not require a clock laser or magic wavelength optical tweezers. We also characterize one- and two-qubit gates, and discuss potential approaches to local gate control. |
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