Correlated Charge Noise and Bit Flip Errors in Superconducting Qubits

ORAL

Abstract

We have characterized fluctuations in offset charge and temporal variations in energy relaxation time in a circuit comprising four weakly charge-sensitive transmon qubits. We find that discrete jumps in offset charge are highly correlated on a length scale over 600 µm; moreover, these jumps are accompanied by a strong transient suppression of qubit energy relaxation time across the millimeter-scale chip. These results are compatible with the direct charging event and associated quasiparticle poisoning due to absorption of gamma rays or cosmic ray muons in the qubit substrate. These results have major implications for proposed schemes to correct quantum errors by monitoring multiqubit parity operators, which assume that errors in the qubit array are uncorrelated.

*This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award \#DE-SC0020313. Parts of this document were prepared using the resources of the Fermi National Accelerator Laboratory (Fermilab), a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359.

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Presenters

  • Chris Wilen

    • University of Wisconsin - Madison
    • University of Wisconsin-Madison

Authors

  • Chris Wilen

    • University of Wisconsin - Madison
    • University of Wisconsin-Madison

  • Sohair Abdullah

    • University of Wisconsin - Madison
    • University of Wisconsin-Madison

  • Noah Alexander Kurinsky

    • Center for Particle Astrophysics, Fermi National Accelerator Labatoratory

  • Laura Cardani

    • 4 INFN Sezione di Roma, P.le Aldo Moro 2, 00185, Rome, Italy

  • Giulia D'Imperio

    • 4 INFN Sezione di Roma, P.le Aldo Moro 2, 00185, Rome, Italy

  • Lara Faoro

    • University of Wisconsin - Madison

  • Lev B Ioffe

    • Google
    • Google Inc - Santa Barbara
    • Google Inc.
    • Google, Inc., Venice, CA 90291 USA

  • Chuanhong Liu

    • University of Wisconsin - Madison

  • Alexander M Opremcak

    • University of Wisconsin - Madison
    • University of Wisconsin-Madison

  • Bradley Christensen

    • University of Wisconsin - Madison

  • Jonathan L DuBois

    • Lawrence Livermore National Laborator
    • Lawrence Livermore National Lab
    • Lawrence Livermore Natl Lab
    • Physics Division, Lawrence Livermore National Laboratory

  • Chris Stanford

    • Physics, Stanford University

  • Claudia Tomei

    • 4 INFN Sezione di Roma, P.le Aldo Moro 2, 00185, Rome, Italy

  • Robert F McDermott

    • University of Wisconsin - Madison