Dissipative Landau Zener transition beyond the weak coupling limit with a superconducting flux qubit

ORAL

Abstract

The Landau-Zener problem for a two-level system is a suitable toy problem for studying quantum tunnelling in an annealer. Coupling to the environment can influence the tunnelling probability and theoretical understanding is only available for specific coupling limits or noise models. We present experimental results on Landau-Zener measurements on a capacitively-shunted flux qubit. The result shows crossover from weak to strong coupling to the environment, consistent with different master equations in different limits. The result gives insight into the scaling of tunnelling probability in a large-scale quantum annealer.

*The research is based upon work supported by the Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA) and the Defense Advanced Research Projects Agency (DARPA), via the U.S. Army Research Office contract W911NF-17-C-0050. 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 ODNI, IARPA, DARPA, or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Governmental purposes notwithstanding any copyright annotation thereon.

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Presenters

  • Xi Dai

    • University of Waterloo

Authors

  • Xi Dai

    • University of Waterloo

  • Robbyn Trappen

    • University of Waterloo

  • Huo Chen

    • University of Southern California
    • Lawrence Berkeley National Laboratory

  • Rui Yang

    • University of Waterloo

  • Denis Melanson

    • University of Waterloo

  • Antonio J Martinez

    • University of Waterloo

  • Muhammet Ali Yurtalan

    • University of Waterloo

  • Yongchao Tang

    • University of Waterloo

  • Rabindra Das

    • Massachusetts Institute of Technology MIT
    • MIT Lincoln Lab

  • 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

  • Cyrus F Hirjibehedin

    • MIT Lincoln Lab

  • Kyle Serniak

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • Steven J Weber

    • MIT Lincoln Lab

  • Jonilyn L Yoder

    • MIT Lincoln Lab
    • MIT Lincoln Laboratory

  • 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

  • Evgeny Mozgunov

    • University of Southern California

  • Daniel A Lidar

    • University of Southern California

  • Adrian Lupascu

    • University of Waterloo, Canada
    • University of Waterloo