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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.


 


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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