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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.

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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