Driven Dynamics and Rotary Echo of a Qubit Tunably Coupled to a Harmonic Oscillator

ORAL

Abstract

We have investigated the driven dynamics of a superconducting flux qubit that is tunably coupled to a microwave resonator. We find that the qubit experiences an oscillating field mediated by off-resonant driving of the resonator, leading to strong modifications of the qubit Rabi frequency. This opens an additional noise channel, and we find that low-frequency noise in the coupling parameter causes a reduction of the coherence time during driven evolution. The noise can be mitigated with the rotary-echo pulse sequence, which, for driven systems, is analogous to the Hahn-echo sequence.

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Authors

  • William Oliver

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Simon Gustavsson

    • Massachusetts Institute of Technology, Cambridge, Massachusetts

  • Jonas Bylander

    • Massachusetts Institute of Technology, Cambridge, Massachusetts

  • Fei Yan

    • Massachusetts Institute of Technology, Cambridge, Massachusetts

  • Pol Forn-Diaz

    • Massachusetts Institute of Technology, Cambridge, Massachusetts

  • Vlad Bolkhovsky

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Danielle Braje

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • George Fitch

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Khalil Harrabi

    • The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, Japan

  • Donna Lennon

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Jovi Miloshi

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Peter Murphy

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Rick Slattery

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Steven Spector

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Ben Turek

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Terry Weir

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Paul Welander

    • MIT Lincoln Laboratory, Lexington, Massachusetts

  • Fumiki Yoshihara

    • The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama, Japan

  • David Cory

    • Institute for Quantum Computing and Department of Chemistry, University of Waterloo, Ontario, Canada

  • Yasunobu Nakamura

    • The University of Tokyo, Komaba, Meguro-ku, Tokyo, Japan

  • Terry Orlando

    • Massachusetts Institute of Technology, Cambridge, Massachusetts