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