Quasiparticle dynamics in offset-charge-sensitive transmons

ORAL

Abstract

Superconducting qubits are a promising platform to realize a large-scale quantum processor. The presence of nonequilibrium quasiparticles sets an inherent limit on the performance of transmons, a mature superconducting qubit architecture. Intentionally operating a transmon in an offset-charge-sensitive regime allows us to probe quasiparticle tunneling dynamics by detection of charge-parity jumps. Simultaneous parity jumps across multiple qubits can be indicative of quasiparticle-induced spatiotemporally-correlated errors, a significant challenge for quantum error correction protocols. In this work, we use a direct-dispersive charge-parity readout scheme to continuously monitor multiple qubits in an OCS transmon array. We implement filtering and shielding to maximally suppress contributions from photon-assisted tunneling. Further, we characterize the charge-parity lifetimes of devices with additional quasiparticle-tunneling mitigation strategies, such as a superconducting backplane.

*This material is based upon work supported under Air Force Contract No. FA8702-15-D-0001. Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the U.S. government or the U.S. Air Force.

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Presenters

  • Felipe Contipelli

    • MIT Lincoln Laboratory

Authors

  • Felipe Contipelli

    • MIT Lincoln Laboratory

  • Patrick M Harrington

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology MIT

  • Max Hays

    • MIT
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology
    • Massachussets Institute of Technology
    • Massachusetts Institute of Technology MIT

  • Renée DePencier Piñero

    • MIT Lincoln Laboratory

  • Kate Azar

    • MIT Lincoln Laboratory
    • Wellesley Coll

  • Greg Calusine

    • MIT Lincoln Lab

  • Thomas M Hazard

    • Lincoln Laboratory, Massachusetts Institute of Technology
    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • David K Kim

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Bethany Niedzielski

    • MIT Lincoln Laboratory

  • Ali Sabbah

    • MIT Lincoln Laboratory

  • Hannah Stickler

    • MIT Lincoln Laboratory

  • Jonilyn L Yoder

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Mollie E Schwartz

    • MIT Lincoln Laboratory

  • William D Oliver

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology MIT

  • Kyle Serniak

    • MIT Lincoln Laboratory & MIT RLE
    • MIT Lincoln Laboratory
    • MIT Lincoln Laboratory, MIT RLE