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 Q02: New Frontiers in Quantum Information Science Using Optical Tweezer ArraysInvited Live Streamed
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Chair: Joonhee Choi, Stanford Room: Ballroom 111 A |
Thursday, June 8, 2023 8:00AM - 8:30AM |
Q02.00001: Preparing and Entangling Laser-cooled Molecules in a Reconfigurable Optical Tweezer Array Invited Speaker: Lawrence W Cheuk Ultracold molecules, with their rich internal structure and long-ranged interactions in long-lived states, have been proposed as a versatile platform for quantum science. In this talk, I will report on recent work in our group on manipulating and controlling laser-cooled molecules in optical tweezer arrays. In particular, I will discuss our explorations in creating arbitrary 1D arrays of single CaF molecules and initializing their internal states, and our recent observations of coherent dipolar interactions between spatially separated pairs of molecules. The dipolar interactions give rise to effective spin-exchange interactions, which we harness to create entangled Bell pairs of molecules on-demand. Our Bell pair generation sequence can be interpreted as implementing an entangling 2-qubit gate, which, combined with local control available in optical tweezer experiments, could allow for digital quantum computing with molecular qubits. In addition to quantum information processing, our observation of effective spin-exchange interactions also lay the groundwork for simulating a variety of quantum spin models using molecular tweezer arrays. With the capability of microscopic readout and the ability to create arbitrary trapping geometries, molecular tweezer arrays could be powerful new platform to study these models in a bottom-up approach. |
Thursday, June 8, 2023 8:30AM - 9:00AM |
Q02.00002: A dual-species Rydberg array of rubidium and cesium atoms Invited Speaker: Kevin Singh Quantum information processing architectures that leverage multiple modalities of qubits offer compelling strategies for suppressing qubit errors, performing quantum non-demolition measurements, and executing auxiliary-qubit based quantum protocols. In this talk, I will present the latest advances from our dual-species atom array composed of rubidium and cesium atomic qubits. We leverage this two-species approach to demonstrate essential tools for scaling up neutral atom-based processors: mid-circuit readout of atom arrays, real-time processing and feed-forward, and coherent mid-circuit reloading of atomic qubits. In particular, I will discuss how these new tools enable us to use mid-circuit measurements on one atomic species to correct correlated phase errors on the other species all within the execution of a quantum circuit [1]. Finally, I will discuss progress towards combining our feedforward operations with programmable intraspecies and interspecies Rydberg gates, which will enable auxiliary-qubit-assisted protocols as required for quantum error correction and measurement-based state preparation. |
Thursday, June 8, 2023 9:00AM - 9:30AM |
Q02.00003: Quantum science with nuclear spin qubits in ytterbium-171 atom arrays Invited Speaker: Jacob Covey Individually controlled neutral atoms are emerging as a leading platform for quantum science. Alkaline earth (-like) atoms in particular offer many new opportunities that utilize their long-lived metastable states and decoupled nuclear spins. In this talk, we will highlight these new directions for quantum science with tweezer arrays and we will summarize the state of the field. We will then focus on our work with arrays of ytterbium-171 atoms. We will present results on non-destructive readout of the ground nuclear spin-1/2 qubit in which the atom remains in the detected state with high probability. We combine this capability with nuclear qubit rotations to realize consecutive measurements in variable bases – a crucial ingredient in measurement-based quantum computing. We will then present our work on excitation to the metastable "clock" state and the associated coherently convertible dual-type nuclear spin qubit. These results are significant steps towards the implementation of quantum computing and networking protocols based on metastable nuclear spin qubits. |
Thursday, June 8, 2023 9:30AM - 10:00AM |
Q02.00004: Integrating strong-coupling cavity QED with atomic tweezer arrays Invited Speaker: Dan M Stamper-Kurn Strongly coupling an atomic optical emitter to an optical resonator, the setting for cavity quantum electrodynamics (QED), allows for exquisite control over matter-light interactions. Optical tweezer arrays, loaded deterministically with a single atom in each tweezer, allow for exquisite control over ultracold atoms and enable a bottom-up approach to constructing many-body quantum systems. I will present an experimental setup that integrates these two approaches to engineering, controlling, and measuring quantum systems made up of atoms and light. I will discuss two scientific pursuits. First, we employ cavity QED to bring new capabilities to the control and measurement of atom tweezer arrays. Specifically, we demonstrate coherent and fast mid-circuit measurement of individual tweezers within an array. Second, we employ tweezer arrays to bring new capabilities to the study of cavity QED. Specifically, we demonstrate control over collective light-atom interactions, observing collective enhancement of light emission from a microscopically constructed atomic ensemble. I will conclude by discussing how our system should allow us to explore various representations of the Dicke model to study mesoscopic effects and a rich set of symmetry classes. |
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