Fast flux qubit gates on a heavy fluxonium

ORAL

Abstract

A capacitively shunted fluxonium qubit has both long life time and coherence time at the half-flux sweet spot. However, the suppressed matrix elements and low transition frequency make it challenging to perform fast fluxon gates via charge coupling. Here, we present schemes for state initialization, fast single-qubit flux gates, and plasmon assisted readout for a fluxonium qubit, demonstrating the feasibility of controlling a superconducting qubit at background temperatures much higher than the operating frequency. This scheme improves the quantum control of fluxonium qubits, making it a strong candidate for quantum information processing. We additionally present schemes for fluxonium two-qubit gates without using lossier higher levels.

**This work was supported by ARO Grant No. W911NF-15-1-0421; SUB0000079

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Presenters

  • Helin Zhang

    • University of Chicago

Authors

  • Helin Zhang

    • University of Chicago

  • Srivatsan Chakram

    • University of Chicago
    • Physics, University of Chicago

  • Nathan D Earnest

    • University of Chicago

  • Yao Lu

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

  • Ziwen Huang

    • Northwestern University
    • Physics, Northwestern University

  • Daniel Weiss

    • Northwestern University
    • Physics, Northwestern University

  • Jens Koch

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

  • David I Schuster

    • University of Chicago
    • Physics, University of Chicago
    • Department of Physics and the James Franck Institute, 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