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Measurement of geometric dephasing using a superconducting qubit

Author

Listed:
  • S. Berger

    (ETH Zurich)

  • M. Pechal

    (ETH Zurich)

  • P. Kurpiers

    (ETH Zurich)

  • A. A. Abdumalikov

    (ETH Zurich)

  • C. Eichler

    (ETH Zurich
    Present address: Department of Physics, Princeton University, Princeton, New Jersey 08544, USA)

  • J. A. Mlynek

    (ETH Zurich)

  • A. Shnirman

    (Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology)

  • Yuval Gefen

    (The Weizmann Institute of Science)

  • A. Wallraff

    (ETH Zurich)

  • S. Filipp

    (ETH Zurich
    Present address: IBM Research-Zurich, 8803 Rueschlikon, Switzerland)

Abstract

A quantum system interacting with its environment is subject to dephasing, which ultimately destroys the information it holds. Here we use a superconducting qubit to experimentally show that this dephasing has both dynamic and geometric origins. It is found that geometric dephasing, which is present even in the adiabatic limit and when no geometric phase is acquired, can either reduce or restore coherence depending on the orientation of the path the qubit traces out in its projective Hilbert space. It accompanies the evolution of any system in Hilbert space subjected to noise.

Suggested Citation

  • S. Berger & M. Pechal & P. Kurpiers & A. A. Abdumalikov & C. Eichler & J. A. Mlynek & A. Shnirman & Yuval Gefen & A. Wallraff & S. Filipp, 2015. "Measurement of geometric dephasing using a superconducting qubit," Nature Communications, Nature, vol. 6(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9757
    DOI: 10.1038/ncomms9757
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