Suppressing 1/f Magnetic Flux Noise in Superconducting Qubits with Weak Magnetic Fields (Part 2)

ORAL

Abstract

1/f magnetic flux noise is known to limit the coherence of superconducting qubits, yet its microscopic origin has remained an open question for decades. While many experimental and theoretical studies have sought to elucidate the physical mechanism, one missing but critical characterization is the noise response to magnetic fields. Here we present the first study of flux-noise-limited dephasing and 1/f noise spectroscopy in superconducting flux qubits subjected to in-plane magnetic fields up to B = 100 G. Notably, in addition to an increase in noise below 1 Hz, we observe a suppression of flux noise in the MHz range accompanied by an enhancement of echo T2 up to 100 G. We also report initial observations of interesting features including magnetic-field-specific avoided crossings in the qubit spectrum and a tri-fold splitting of the qubit frequency at certain magnetic fields. This study presents a new experimental angle into the exploration of surface magnetic defects, and ultimately should help 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. D.A.R. funded by NSF award DMR-1747426. 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

  • Lamia Ateshian

    • Massachusetts Institute of Technology (MIT)

Authors

  • Lamia Ateshian

    • Massachusetts Institute of Technology (MIT)

  • David A Rower

    • MIT, Oliver Group (EQuS)
    • 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