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Single Flux Quantum-Based Superconducting Qubit Control and Quasiparticle Mitigation

POSTER

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 a multi-chip module (MCM) architecture to suppress phonon-mitigated QP poisoning, where the SFQ unit and the qubit unit are fabricated on two chips separated by Indium bump bonds. Additionally, we use superconducting bandgap engineering to mitigate QP poisoning in this system. We further characterize the SFQ-based gates fidelity in the MCM structure with randomized benchmarking.

Presenters

  • Chuanhong Liu

    University of Wisconsin - Madison

Authors

  • Chuanhong Liu

    University of Wisconsin - Madison

  • Alexander M Opremcak

    University of Wisconsin - Madison

  • Chris D Wilen

    University of Wisconsin - Madison, University of Wisconsin, Madison

  • Owen Rafferty

    University of Wisconsin - Madison

  • Andrew L Ballard

    Syracuse University

  • Vito M Iaia

    Syracuse University

  • Tianna A McBroom

    Syracuse University

  • Yebin Liu

    Syracuse University

  • Kenneth R Dodge

    Syracuse University

  • Jaseung Ku

    Syracuse University

  • David Olaya

    National Institute of Standards and Technology Boulder; University of Colorado, Boulder, National Institute of Standards and Technology Boulder

  • John P Biesecker

    National Institute of Standards and Technology Boulder

  • Adam J Sirois

    National Institute of Standards and Technology Boulder

  • Dan Schmidt

    National Institute of Standards and Technology Boulder

  • Joel N Ullom

    National Institute of Standards and Technology, National Institute of Standards and Technology Boulder; University of Colorado, Boulder, National Institute of Standards and Technology Boulder

  • Samuel P Benz

    National Institute of Standards and Technology Boulder

  • Peter Hopkins

    National Institute of Standards and Technology Boulder

  • Jonathan L DuBois

    Lawrence Livermore Natl Lab

  • Britton L Plourde

    Syracuse University

  • Robert McDermott

    University of Wisconsin - Madison