Single Flux Quantum-Based Superconducting Qubit Control and Quasiparticle Mitigation: Part 2

ORAL

Abstract

The Single Flux Quantum (SFQ) digital logic family has been proposed as a scalable approach for the control of next-generation multiqubit arrays. In an initial implementation, the fidelity of SFQ-based qubit gates was limited by quasiparticle (QP) poisoning induced by the dissipative SFQ driver. Here we introduce superconducting bandgap engineering as a mitigation strategy to suppress QP poisoning in this system. We explore low-gap moats and high-gap fences surrounding the qubit structure, along with a geometry involving extensive coverage of the high-gap groundplane with low-gap traps. We use charge-sensitive transmon qubits to evaluate the effectiveness of the various mitigation strategies in experiments involving direct QP injection.

*Prepared in part by LLNL under Contract DE-AC52-07NA27344.

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Presenters

  • Chuanhong Liu

    • University of Wisconsin - Madison

Authors

  • Chuanhong Liu

    • University of Wisconsin - Madison

  • Alexander M Opremcak

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

  • Chris Wilen

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

  • Edward M Leonard

    • University of Wisconsin - Madison
    • University of Wisconsin-Madison
    • Northrop Grumman - Mission Systems

  • Matthew A Beck

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

  • Sohair Abdullah

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

  • Andrew Ballard

    • Syracuse University

  • Vito M Iaia

    • Syracuse University

  • Tianna A. McBroom

    • Syracuse University

  • Yebin Liu

    • Syracuse University

  • Kenneth Dodge

    • Syracuse University

  • Jaseung Ku

    • Syracuse University

  • David Olaya

    • National Institute of Standards and Technology
    • National Institute of Standards and Technology Boulder

  • Dan Schmidt

    • National Institute of Standards and Technology
    • National Institute of Standards and Technology Boulder

  • Tammy Lucas

    • National Institute of Standards and Technology
    • National Institute of Standards and Technology Boulder

  • John Biesecker

    • National Institute of Standards and Technology
    • National Institute of Standards and Technology Boulder

  • Manuel A Castellanos-Beltran

    • National Institute of Standards and Technology
    • National Institute of Standards and Technologies

  • michael R. vissers

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology

  • Peter Hopkins

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology
    • National Institute of Standards and Technologies

  • Joel N Ullom

    • National Institute of Standards and Technology
    • National Institute of Standards and Technology Boulder

  • Samuel P Benz

    • National Institute of Standards and Technology Boulder
    • National Institute of Standards and Technology
    • National Institute of Standards and Technologies

  • Jonathan L DuBois

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

  • Britton Plourde

    • Syracuse University

  • Robert F McDermott

    • University of Wisconsin - Madison