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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.

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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