High-Fidelity Measurements of Long-Lived Flux Qubits

ORAL

Abstract

We report on high-fidelity dispersive measurements of a long-lived flux qubit using a Josephson superconducting traveling wave parametric amplifier (JTWPA). A capacitively shunted flux qubit that incorporates high-Q MBE aluminum will have longer relaxation and dephasing times when compared to a conventional flux qubit, while also maintaining the large anharmonicity necessary for complex gate operations. The JTWPA relies on a Josephson junction embedded transmission line to deliver broadband, nonreciprocal gain with large dynamic range. This research was funded in part by the Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA); and by the Assistant Secretary of Defense for Research {\&} Engineering under Air Force Contract number FA8721-05-C-0002. All statements of fact, opinion or conclusions contained herein are those of the authors and should not be construed as representing the official views or policies of

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Authors

  • David Hover

    • MIT Lincoln Laboratory

  • Chris Macklin

    • University California Berkeley

  • Kevin O'Brien

    • University California Berkeley

  • Adam Sears

    • MIT Lincoln Laboratory

  • Jonilyn Yoder

    • MIT Lincoln Laboratory

  • Theodore Gudmundsen

    • MIT Lincoln Laboratory

  • Andrew Kerman

    • MIT Lincoln Laboratory

  • Vladimir Bolkhovsky

    • MIT Lincoln Laboratory

  • Sergey Tolpygo

    • MIT Lincoln Laboratory

  • George Fitch

    • MIT Lincoln Laboratory

  • Terry Weir

    • MIT Lincoln Laboratory

  • Archana Kamal

    • Massachusetts Institute of Technology
    • Research Laboratory of Electronics, Massachusetts Institute of Technology
    • Research Laboratory of Electronics, MIT
    • MIT

  • Simon Gustavsson

    • Research Laboratory of Electronics, Massachusetts Institute of Technology
    • Research Laboratory of Electronics, MIT
    • MIT

  • Fei Yan

    • Research Laboratory of Electronics, Massachusetts Institute of Technology
    • Research Laboratory of Electronics, MIT
    • MIT

  • Jeff Birenbaum

    • University California Berkeley

  • I. Siddiqi

    • Quantum Nanoelectronics Laboratory, Department of Physics, University of California, Berkeley CA
    • QNL, University of California, Berkeley
    • University California Berkeley
    • University of California at Berkeley

  • Terry Orlando

    • Research Laboratory of Electronics, MIT

  • John Clarke

    • University California Berkeley
    • UC Berkeley

  • William Oliver

    • MIT Lincoln Laboratory
    • MIT Lincoln Laboratory;Research Laboratory of Electronics, MIT