Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session E02: Deborah Jin Award for Outstanding Doctoral Thesis Research in Atomic, Molecular, or Optical Physics SessionInvited Live Streamed Prize/Award Special Event
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Chair: Monika Schleier-Smith, Stanford Room: Grand Ballroom A |
Tuesday, May 31, 2022 2:30PM - 3:00PM |
E02.00001: FINALIST: One, two, many holes: new insights into the doped Fermi-Hubbard model Invited Speaker: Annabelle Bohrdt Quantum simulation experiments are now realizing extended two-dimensional systems in and out- of equilibrium, at increasingly lower temperatures, thus starting to explore theoretically uncharted territory. Perhaps the most enigmatic example for the application of quantum simulation is the Fermi-Hubbard model, believed to capture the physics underlying high-temperature superconductivity in the cuprate materials. In this talk, I will discuss how the rich microscopic structure of a single hole in the half-filled Fermi-Hubbard model — a magnetic polaron — can be revealed through novel probes, such as new spectroscopic tools and pattern search algorithms. I will show how this microscopic picture of individual magnetic polarons provides an accurate description at small but finite doping by analyzing quantum gas microscope images in terms of higher order correlations. In order to make this comparison completely unbiased, we have pioneered the application of machine learning techniques to quantum snapshots of the Fermi- Hubbard model. As an outlook, I will discuss a binding mechanism, which we have identified based on our understanding of a single dopant, leading to pairing of charge carriers at currently accessible experimental temperatures. |
Tuesday, May 31, 2022 3:00PM - 3:30PM |
E02.00002: FINALIST: Deep Laser Cooling and Coherent Control of Molecules Invited Speaker: Luke A Caldwell Ultracold molecules offer qualitatively different properties to those of atoms, promising a wide range of diverse and exciting applications. These include controlled quantum chemistry, probes of physics beyond the Standard Model, and—by utilizing the long-range dipole-dipole interactions between pairs of molecules—simulation of many-body quantum systems and quantum information processing. However, the rich internal structure of molecules makes the required control of their motional and internal states difficult. Here I describe our development of the tools required to produce, trap, cool, and control CaF molecules. I detail experimental results capturing CaF molecules in a MOT, cooling them to 5 μK in a blue-detuned optical molasses, and using a combination of optical pumping and coherent microwave control to transfer them to a state where they can be magnetically trapped for up to 5 s. Finally, I will look forward and discuss how we can implement high-fidelity quantum gates between pairs of these ultracold molecules.
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Tuesday, May 31, 2022 3:30PM - 4:00PM |
E02.00003: Deborah Jin Award for Outstanding Doctoral Thesis Research in Atomic, Molecular, or Optical Physics Recipient: Quantum Information Processing and Quantum Simulation with Programmable Rydberg Atom Arrays Invited Speaker: Harry Levine A frontier challenge in quantum science and technology is the construction of scalable quantum systems which can operate in regimes beyond classical simulatability. Such systems can be used as tools for simulating complex phenomena in quantum physics, as well as for applications in quantum information processing. In this talk, I will discuss the development of an apparatus featuring individual control of hundreds of atoms. Atoms are trapped in optical tweezers and sorted in real-time into programmable geometries in one and two dimensions. After initialization of an array, interactions are switched on by coherent excitation to highly excited Rydberg states, resulting in a rich many-body spin Hamiltonian. Within this platform, we explore quantum phases which emerge in several different lattice geometries, ranging from simple antiferromagnetic ordered phases to a complex quantum spin liquid phase which emerges on a frustrated ruby lattice. We additionally develop this platform into a quantum information architecture in which qubits are encoded in hyperfine atomic levels and Rydberg states are used for high-fidelity entangling gates. We show that hyperfine qubits can be transported and rearranged while preserving coherence, enabling dynamically reconfigurable gate connectivity, and demonstrate this tool by creating several entangled graph states. This work highlights the features and opportunities for scalable quantum simulation and quantum information processing using neutral atom arrays. |
Tuesday, May 31, 2022 4:00PM - 4:30PM |
E02.00004: FINALIST: Novel Chirality and Symmetry Properties of Light and their Utilization for Ultrafast Spectroscopy Invited Speaker: Ofer Neufeld In recent years high harmonic generation (HHG) has prevailed as a highly effective approach for ultrafast spectroscopy of atoms and molecules, allowing sub-femtosecond resolution for a variety of chemical and physical properties. However, due to the process inherent extreme nonlinearity, a unified approach for extracting physical information from measured spectra is missing. The difficulty in connecting between the system’s degrees of freedom of interest and measurements is especially limiting in complex chemical systems such as chiral molecules. In my talk, I will discuss our recent progress in this direction. I will present a closed-form symmetry theory for light-matter interactions, which when applied to HHG, gives rise to several novel applications: (i) its consistent and unified utilization for ultrafast symmetry breaking spectroscopy techniques (e.g. for molecular ring currents); (ii) The derivation of new chirality density terms in electromagnetic theory that are analogous to molecular-chirality – these allow background free determination of enantiomeric-excess in all-optical measurements through intense electric-dipole transitions; (iii) Tailored control of the temporal, spectral, and polarization, properties of XUV light. |
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