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

S. Gustavsson, J. Bylander, F. Yan, P. Forn-Díaz, V. Bolkhovsky, D. Braje, G. Fitch, K. Harrabi, D. Lennon, J. Miloshi, P. Murphy, R. Slattery, S. Spector, B. Turek, T. Weir, P. B. Welander, F. Yoshihara, D. G. Cory, Y. Nakamura, T. P. Orlando, and W. D. Oliver
Phys. Rev. Lett. 108, 170503 – Published 27 April 2012

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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  • Received 7 November 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.170503

© 2012 American Physical Society

Authors & Affiliations

S. Gustavsson1, J. Bylander1, F. Yan2, P. Forn-Díaz1,*, V. Bolkhovsky3, D. Braje3, G. Fitch3, K. Harrabi4,†, D. Lennon3, J. Miloshi3, P. Murphy3, R. Slattery3, S. Spector3, B. Turek3,‡, T. Weir3, P. B. Welander3, F. Yoshihara4, D. G. Cory5,6, Y. Nakamura4,7,§, T. P. Orlando1, and W. D. Oliver1,3

  • 1Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 2Department of Nuclear Science and Engineering, MIT, Cambridge, Massachusetts 02139, USA
  • 3MIT Lincoln Laboratory, 244 Wood Street, Lexington, Massachusetts 02420, USA
  • 4The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
  • 5Institute for Quantum Computing and Department of Chemistry, University of Waterloo, Ontario, Canada
  • 6The Perimeter Institute for Theoretical Physics, Ontario, Canada
  • 7Green Innovation Research Laboratories, NEC Corporation, Tsukuba, Ibaraki 305-8501, Japan

  • *Present address: Norman Bridge Laboratory of Physics, California Institute of Technology, Pasadena, CA 91125, USA.
  • Present address: Physics Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia.
  • Present address: The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA.
  • §Present address: Research Center for Advanced Science and Technology (RCAST), University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8904, Japan.

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Vol. 108, Iss. 17 — 27 April 2012

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