ZZ-Free Two-Qubit CZ Gate Based on Fluxonium Coupler

ORAL

Abstract

In this talk, we propose an adiabatic, coupler-flux-biased controlled-Z (CZ) gate that is implemented between two transmon qubits coupled via a fluxonium, an architecture we call T-F-T. The coupling mediated by fluxonium allows the ZZ interaction to be completely canceled while the two transmons are outside of the straddling regime. This makes the architecture less susceptible to the microwave crosstalk and frequency crowding. We experimentally verified that complete ZZ cancellation is possible with two-qubits biased in the off-straddling regime. In addition, we will discuss characterization and optimization of CZ gate fidelity.

*This research was sponsored by the Army Research Office Grant No. W911NF-23-1-0045, and by the Secretary of Defense for Research and Engineering under Air Force Contract No. FA8702-15-D-0001. J.A. acknowledges support from Korea Foundation for Advanced Studies. The views and conclusions contained herein are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Office or the U.S. government.

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Presenters

  • Junyoung An

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology

Authors

  • Junyoung An

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology

  • Leon Ding

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology

  • Youngkyu Sung

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MIT

  • Roni Winik

    • Massachusetts Institute of Technology
    • Massachusetts Institute of Technology MI

  • Junghyun Kim

    • Massachusetts Institute of Technology

  • 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

  • Ilan T Rosen

    • Massachusetts Institute of Technology

  • David A Rower

    • MIT
    • MIT, Oliver Group (EQuS)

  • Kate Azar

    • MIT Lincoln Laboratory
    • Wellesley Coll

  • Jeffrey M Gertler

    • MIT Lincoln Laboratory
    • University of Massachusetts Amherst

  • Michael A Gingras

    • MIT Lincoln Laboratory

  • Thomas M Hazard

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

  • Bethany Niedzielski

    • MIT Lincoln Laboratory

  • Hannah Stickler

    • MIT Lincoln Laboratory

  • Mollie E Schwartz

    • MIT Lincoln Laboratory

  • Jonilyn L Yoder

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Joel I Wang

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology

  • Terry P Orlando

    • 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
    • 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

  • William D Oliver

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