Calibration of flux crosstalk in flux qubit based quantum annealers with persistent current readout devices

ORAL

Abstract

Quantum annealing with superconducting flux qubits requires reliable control of externally applied magnetic fluxes. We present results on the calibration of flux crosstalk in a device consisting of two flux qubits coupled by a chain of seven couplers. The device has 27 superconducting loops and 27 bias lines. The method relies on the use of flux detectors formed of RF-SQUID terminated waveguide resonators, attached to each qubit and coupler. An iterative version of the method is demonstrated, which is more tolerant to errors arising from persistent currents in the complete circuits. The ability to perform reliable crosstalk calibration and compensation allows maintaining high coherence qubit designs and eliminates overhead in designs that are robust against crosstalk. We discuss future extensions of this work, relevant for large scale annealing control.

*This material is based upon work supported by the Intelligence Advanced Research Projects Activity (IARPA) and the Army Research Office (ARO) under Contract No. W911NF-17-C-0050. Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the Intelligence Advanced Research Projects Activity (IARPA) and the Army Research Office (ARO).

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Presenters

  • Xi Dai

    • University of Waterloo

Authors

  • Xi Dai

    • University of Waterloo

  • Antonio Javier Martinez

    • University of Waterloo

  • Daniel M Tennant

    • University of Waterloo

  • Denis Melanson

    • University of Waterloo

  • Ali Yurtalan

    • University of Waterloo

  • Salil Bedkihal

    • University of Waterloo

  • Yongchao Tang

    • University of Waterloo

  • Alexander Melville

    • MIT Lincoln Laboratory
    • MIT Lincoln Lab
    • MIT Lincoln Laboratories
    • Massachusetts Institute of Technology (MIT) Lincoln Laboratory

  • Bethany Niedzielski

    • MIT Lincoln Laboratory

  • Rabindra Das

    • MIT Lincoln Laboratory
    • MIT Lincoln Laboratories

  • David K Kim

    • MIT Lincoln Laboratory
    • MIT Lincoln Lab
    • MIT-Lincoln Lab
    • MIT Lincoln Laboratories
    • Lincoln Laboratory, Massachusetts Institute of Technology (MIT)
    • Massachusetts Institute of Technology (MIT) Lincoln Laboratory

  • Jonilyn Yoder

    • MIT Lincoln Laboratory
    • MIT Lincoln Lab
    • Massachusetts Institute of Technology (MIT) Lincoln Laboratory

  • Steven Weber

    • MIT Lincoln Laboratory

  • Andrew James Kerman

    • MIT Lincoln Laboratory

  • Sergey Novikov

    • Northrop Grumman
    • Northrop Grumman - Mission Systems
    • Northrop Grumman Corporation

  • Steven M Disseler

    • Northrop Grumman
    • Northrop Grumman - Mission Systems
    • Northrop Grumman Corporation

  • James I Basham

    • Northrop Grumman
    • Northrop Grumman - Mission Systems
    • Northrop Grumman Corporation

  • Jeffrey Grover

    • Northrop Grumman
    • Northrop Grumman - Mission Systems
    • Northrop Grumman Corporation

  • Evgeny Mozgunov

    • University of Southern California
    • Viterbi school of engineering, University of Southern California

  • Daniel A Lidar

    • University of Southern California
    • Univ of Southern California
    • 5. University of Southern California, Los Angeles, California 90089, USA

  • Adrian Lupascu

    • University of Waterloo