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 Z06: Hybrid Quantum System and QuditsRecordings Available

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Chair: Crystal Noel, Duke Room: Salon 1/2 
Friday, June 3, 2022 10:30AM  10:42AM 
Z06.00001: Variational approach to atommembrane dynamics Dennis P Clougherty A timedependent description of the interaction of a cold atom with a vibrating membrane is formulated using the DiracFrenkel variational method. The timedependent variational state is taken to be a superposition of a free atom with a thermal distribution of phonons and an atom bound to the membrane accompanied by a generalized coherent state of phonons. An effective Lagrangian follows from this variational ansatz. The resulting coupled EulerLagrange equations are treated analytically to give a description of the system. Distinct dynamical regimes are identified with the use of zeropole maps and rootlocus diagrams in the complex splane. 
Friday, June 3, 2022 10:42AM  10:54AM 
Z06.00002: Rydberg atoms in optical tweezers near a nanophotonic cavity Ivana Dimitrova, Paloma Ocola, Brandon Grinkemeyer, Elmer GuardadoSanchez, Tamara Dordevic, Polnop Samutpraphoot, Vladan Vuletic, Mikhail Lukin While Rydberg arrays have emerged as a promising platform for quantum computation, their integration with a photonic interface could enable fast readout for error correction and quantum networking. This is challenging due to the strong electric field polarizability of Rydberg atoms, making them extremely sensitive to surface charges. Here we place Rydberg atoms in optical tweezers near a nanophotonic cavity and measure their coherence properties as a function of their distance from the cavity. At distances shorter than 100um, the fluctuations of the electric field are prohibitively large. At larger distances, decoupling sequences can be used to preserve coherence. Such distances can easily be bridged by using AODs [1]. Furthermore, we have demonstrated entanglement transport away from the nanophotonic cavity [2]. This renders the nanophotonic cavity a promising candidate for a photonic link for Rydberg arrays, situated a few hundred micrometers away. 
Friday, June 3, 2022 10:54AM  11:06AM 
Z06.00003: A hybrid system for interfacing mmwave and optical photons: Part 1 Lavanya Taneja, Aishwarya Kumar, Mark J Stone, Aziza Suleymanzade, Alexander V Anferov, Tingran Wang, David Schuster, Jonathan Simon In this talk, I will describe a hybrid quantum platform for interfacing single optical and mmwave photons using Rydberg atoms as mediators. Our system features a superconducting mmwave resonator crossed with an optical FabryPerot cavity in a 4K cryostat, with optical access for trapping Rubidium atoms at the intersection of the two resonators. High quality factors for the mmwave cavity, large dipole moments and long lifetimes of Rydberg states enable high singleatom cooperativities at the 100 GHz mmwave transition. These capabilities can enable spin squeezing using the mmwave cavity and quantum transduction between mmwave and optical frequency regimes. I will also share some observations from our setup including cavity Rydberg electromagnetically induced transparency (EIT), AutlerTownes splitting of the Rydberg states with a coherent mmwave drive, and meanfield optical nonlinearities induced by the mmwave cavity. This talk is the first of two parts. 
Friday, June 3, 2022 11:06AM  11:18AM 
Z06.00004: A hybrid system for interfacing mmwave and optical photons: Part 2 Aishwarya Kumar, Lavanya Taneja, Mark J Stone, Aziza Suleymanzade, Alexander V Anferov, Tingran Wang, David Schuster, Jonathan Simon In the second of the two talks, I will describe integrating a high power ultraviolet (UV) 297 nm laser into our hybrid experimental setup. The UV laser closes the loop for interconversion between the mmwave and optical modes. It also enables fast coherent excitation to the rydberg state, where the high cooperativity mmwave cavity can be used to generate spinsqueezing. We observe that the UV laser strongly affects the finesse and the effective length of the optical cavity, and I will describe how we overcome these effects. I will also describe how the optical cavity can be used to efficiently detect depletion of the atoms from ground state due to the UV laser, thus enabling spectroscopy of the direct rydberg transition as well as observation of rabiflopping in a cloud of atoms. I will also give an update on quantum transduction in this system. 
Friday, June 3, 2022 11:18AM  11:30AM 
Z06.00005: Is a retarded electron transfer shorter lived? Axel Molle The BariumRubidium Interaction Experiment observes short lifetimes of central barium cations at ultracold temperatures due to electron transfer from the surrounding BoseEinstein condensate of neutral rubidium atoms. 
Friday, June 3, 2022 11:30AM  11:42AM 
Z06.00006: Implementing symmetric entangling gates using quantum optimal control on nuclearspin qudits in ^{87}Sr atoms sivaprasad T Omanakuttan, Anupam Mitra, Michael J Martin, Ivan H Deutsch Qudits can be robustly encoded in nuclear spins of alkaline earth atoms and manipulated with magnetooptical fields. In [1], we showed that how arbitrary SU(d) singlequdit unitary maps can be implemented in such systems using quantum optimal control. We applied this in the case of the I=9/2 nuclear spin in ^{87}Sr, a d=10 dimensional qudit, through a combination of nuclear spinresonance and a tensor ACStark shift. Augmenting our toolkit with Rydberg dressing allows us to create any symmetric entangling twoqudit gate such as CPHASE. Our techniques can be used to implement a qudit entangler for qudits from d=2 to d=10 encoded in the nuclear spin using partial isometries. We also studied how decoherence due to leakage affects the creation of qudit entanglers and one could achieve a fidelity of 0.9979, 0.9966, 0.9734, and 0.9638 for d=2, 3, 5, and 7 respectively. This provides a powerful platform to explore the various applications of quantum information processing of qudits including metrological enhancement with qudits, quantum simulation, universal quantum computation, and quantum error correction. 
Friday, June 3, 2022 11:42AM  11:54AM 
Z06.00007: High fidelity state preparataion and measurement of ion qubits with spin I > 1/2 Anthony M Ransford, Andrew Schaffer, Fangzhao An, James Hostetter, John Gaebler, Lucas Sletten, Grahame Vittorini We present a method of state preparation and measurement (SPAM) that is amenable to trapped ion hyperfine qubits with nuclear spins 
Friday, June 3, 2022 11:54AM  12:06PM 
Z06.00008: AKLT ground state in "Bosonic Qiskit" Eleanor Crane, Kevin C Smith, Timothy Stavenger, Christopher Kang, Nathan Wiebe, Steven M Girvin A collaboration within the Codesign Center for Quantum Advantage (C2QA) is currently building an instruction set architecture for hybrid qubit/oscillator circuit QED hardware using Qiskit, the IBM opensource software development kit (SDK). Qiskit has been designed to operate on twolevel systems. The aim is to create a branch of Qiskit called "Bosonic Qiskit" which can accommodate continuous variable systems with a view to using "Bosonic Qiskit" to represent circuit QED hardware in the future. As a proof of concept of "Bosonic Qiskit", we use it to implement a symmetry protected topological state  the seminal AKLT chain  using the native bosonic operations made available in the SDK. 
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