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Dephasing in Fluxonium Qubits from Coherent Quantum Phase Slips

ORAL

Abstract

Recent experiments on fluxonium qubits in planar circuit architectures have demonstrated near-record coherence times and gate fidelities. In order to improve these metrics further, we seek to develop a holistic model of decoherence in fluxonium qubits. Here we focus on one dephasing mechanism inherent to Josephson junction arrays which arises from the Aharonov-Casher effect and can limit fluxonium coherence times in circuits with large superinductors. In this talk, we report coherence times in fluxonium qubits specifically engineered to be sensitive to this dephasing mechanism and compare with theoretical models.

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Presenters

  • Kyle Serniak

    MIT Lincoln Laboratory

Authors

  • Kyle Serniak

    MIT Lincoln Laboratory

  • Thomas M Hazard

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Agustin Di Paolo

    Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology

  • Kate Azar

    MIT Lincoln Laboratory

  • Leon Ding

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology

  • Max Hays

    Massachusetts Institute of Technology (MIT), MIT, Massachusetts Institute of Technology

  • Junyoung An

    Massachusetts Institute of Technology, Massachusetts Institute of Technology MIT

  • Ilan T Rosen

    Stanford Univ, Massachusetts Institute of Technology

  • David K Kim

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Alexander Melville

    MIT Lincoln Laboratory

  • Bethany M Niedzielski

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • Jeffrey A Grover

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology

  • Mollie E Schwartz

    MIT Lincoln Laboratory

  • Jonilyn L Yoder

    MIT Lincoln Lab, MIT Lincoln Laboratory

  • William D Oliver

    Massachusetts Institute of Technology MIT, Massachusetts Institute of Technology (MIT), MIT Lincoln Laboratory, Massachusetts Institute of Technology (MIT), Massachusetts Institute of Technology, Massachusetts Institute of Technology, MIT Lincoln Laboratory