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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.

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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