Suppressing 1/f Magnetic Flux Noise in Superconducting Qubits with Weak Magnetic Fields (Part 1)

ORAL

Abstract

The microscopic origin of 1/f magnetic flux noise in superconducting circuits has remained an open question for several decades, despite extensive experimental and theoretical investigation. One crucial missing piece to develop a microscopic theory of the noise mechanism is the response to external magnetic fields. We apply in-plane magnetic fields to flux qubits, and study flux-noise-limited dephasing. We observe an enhancement of spin-echo T2 in fields up to B = 100 G. We measure the flux noise spectrum directly over several decades, and observe the suppression of flux noise in the MHz range accompanied by an enhancement of flux noise below 1 Hz. These results constitute the first characterization of flux noise limited dephasing in applied magnetic fields, which we hope will help to inform a complete microscopic theory of 1/f flux noise in superconducting circuits.

*This material is based upon work supported in part by the National Science Foundation Graduate Research Fellowship under Grant No. 1745302, in part by the Under Secretary of Defense for Research and Engineering under Air Force Contract No. FA8702-15-D-0001, and in part by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Co-design Center for Quantum Advantage (C2QA) under contract number DE-SC0012704. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the US Government.

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Publication: Suppressing 1/f Flux Noise in Superconducting Qubits with Weak Magnetic Fields, in preparation

Presenters

  • David A Rower

    • MIT, Oliver Group (EQuS)
    • MIT

Authors

  • David A Rower

    • MIT, Oliver Group (EQuS)
    • MIT

  • Lamia Ateshian

    • Massachusetts Institute of Technology (MIT)

  • Max Hays

    • Massachusetts Institute of Technology (MIT)
    • MIT
    • Massachusetts Institute of Technology

  • Kyle Serniak

    • MIT Lincoln Laboratory

  • Lauren H Li

    • Massachusetts Institute of Technology

  • Bharath Kannan

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Leon Ding

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Dolev Bluvstein

    • Harvard University

  • Aziza Almanakly

    • Massachusetts Institute of Technology

  • Jochen Braumueller

    • Massachusetts Institute of Technology MIT

  • David K Kim

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Alexander Melville

    • MIT Lincoln Laboratory

  • Bethany M Niedzielski

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Jonilyn L Yoder

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Mollie E Schwartz

    • MIT Lincoln Laboratory

  • Terry P Orlando

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Joel I Wang

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Simon Gustavsson

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Jeffrey A Grover

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology

  • Riccardo Comin

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • 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