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Fast flux gates in inductively coupled fluxonium qubits

ORAL

Abstract

The heavy-fluxonium qubit is a promising building block for superconducting quantum processors due to its long relaxation and dephasing times at the flux-frustration point. However, the suppressed charge matrix elements and small splitting between computational states have made it challenging to perform fast single and two-qubit gates with conventional methods. In order to achieve high-fidelity initialization and readout, we demonstrate protocols utilizing higher levels beyond the computational subspace. We realize fast qubit control using a universal set of single-cycle flux gates, which are comprised of directly synthesizable pulses, and reach fidelities exceeding 99.8%. Finally, we discuss a set of flux-controlled two-qubit gates for inductively coupled fluxonium qubits. We believe that the fast, flux-based control combined with the coherence properties of the heavy fluxonium make this circuit one of the most promising candidates for next-generation superconducting qubits.

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Presenters

  • Helin Zhang

    University of Chicago

Authors

  • Helin Zhang

    University of Chicago

  • Srivatsan Chakram

    Department of Physics and Astronomy, Rutgers University, Physics and Astronomy, Rutgers University, Rutgers University, University of Chicago

  • Tanay Roy

    University of Chicago, The James Franck Institute and Department of Physics, The University of Chicago

  • Chunyang Ding

    University of Chicago

  • Brian Baker

    Physics and Astronomy, Northwestern University, Physics, Northwestern University

  • Daniel Weiss

    Department of Physics and Astronomy, Northwestern University, Physics, Northwestern University

  • Ziwen Huang

    Northwestern University, Physics, Northwestern University

  • Jens Koch

    Physics, Northwestern University, Northwestern University, Department of Physics and Astronomy, Northwestern University, Physics and Astronomy, Northwestern University

  • David I Schuster

    University of Chicago, The James Franck Institute and Department of Physics, University of Chicago, The James Franck Institute and Department of Physics, The University of Chicago