Time-Resolved Measurement of Dissipation-Induced Decoherence in a Josephson Junction

DOI Web Site 被引用文献1件
  • Siyuan Han
    Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA.
  • Yang Yu
    Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA.
  • Xi Chu
    Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA.
  • Shih-I Chu
    Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA.
  • Zhen Wang
    Kansai Advanced Research Center, Communication Research Laboratory, Ministry of Posts and Telecommunications, 588-2 Iwaoka, Iwaoka-cho, Nishi-ku, Kobe, 651-24 Japan.

抄録

<jats:p> We determined the dissipation-induced decoherence time (DIDT) of a superconducting Josephson tunnel junction by time-resolved measurements of its escape dynamics. Double-exponential behavior of the time-dependent escape probability was observed, suggesting the occurrence of a two-level decay-tunneling process in which energy relaxation from the excited to the ground level significantly affects the escape dynamics of the system. The observation of temporal double-exponential dependence enables direct measurements of the DIDT, a property critical to the study of quantum dynamics and the realization of macroscopic quantum coherence and quantum computing. We found that the DIDT was τ <jats:sub>d</jats:sub> > 11 μs at <jats:italic>T</jats:italic> = 0.55 K, demonstrating good prospects for implementing quantum computing with Josephson devices. </jats:p>

収録刊行物

  • Science

    Science 293 (5534), 1457-1459, 2001-08-24

    American Association for the Advancement of Science (AAAS)

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