Characterizing and mitigating crosstalk errors of simultaneous entangling gates in a superconducting circuit

ORAL

Abstract

The ability to perform simultaneous two-qubit gates with low error rates is a key requirement to run a quantum algorithm with as short of a circuit depth as possible. However, crosstalk errors in a superconducting qubit system, mostly originating from stray electromagnetic coupling between circuit elements, make it challenging to implement simultaneous entangling gates with high fidelities. Here, we characterize and mitigate crosstalk errors in a 2x2 array of superconducting qubits, where adjacent qubit-qubit interactions are mediated by tunable couplers. We benchmark the fidelities of simultaneous two-qubit gates (CZ-CZ, CZ-iSWAP, or iSWAP-iSWAP) applied on qubit pairs and identify dominant error sources on a case-by-case basis.


 


*This research was funded in part by the U.S. Army Research Office (ARO) Multidisciplinary University Research Initiative (MURI) W911NF-18-1-0411; and by the Under Secretary of Defense for Research and Engineering under Air Force Contract No. FA8702-15-D-0001. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the US Government.

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Presenters

  • Youngkyu Sung

    • Massachusetts Institute of Technology MIT

Authors

  • Youngkyu Sung

    • Massachusetts Institute of Technology MIT

  • Amy Greene

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology MIT

  • Leon Ding

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology MI

  • Agustin Di Paolo

    • Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
    • Universite de Sherbrooke
    • MIT
    • Massachusetts Institute of Technology MIT
    • Research Laboratory of Electronics, Massachusetts Institute of Technology
    • Massachusetts Institute of Technology

  • Gabriel O Samach

    • Massachusetts Institute of Technology MIT
    • MIT

  • Bharath Kannan

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology MI

  • Antti Vepsalainen

    • Massachusetts Institute of Technology MIT

  • Jochen Braumueller

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • Roni Winik

    • Massachusetts Institute of Technology MIT

  • Elaine Pham

    • Massachusetts Institute of Technology MIT

  • David K Kim

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Alexander Melville

    • MIT Lincoln Laboratory
    • MIT Lincoln Lab

  • Bethany M Niedzielski

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Kyle Serniak

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Mollie E Schwartz

    • MIT Lincoln Laboratory
    • MIT Lincoln Lab

  • Jonilyn L Yoder

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Jeffrey A Grover

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science
    • Massachusetts Institute of Technology MIT
    • Northrop Grumman - Mission Systems
    • Massachusetts Institute of Technology

  • Joel I Wang

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology MI

  • Terry P Orlando

    • Massachusetts Institute of Technology MIT

  • Simon Gustavsson

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology

  • William D Oliver

    • Massachusetts Institute of Technology MIT
    • Massachusetts Institute of Technology Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology Research Laboratory of Electronics
    • MIT Lincoln Laboratory and Department of Electrical Engineering & Computer Science and Department of Physics, Massachusetts Institute of Technology