Time-Resolved Measurement of Dissipation-Induced Decoherence in a Josephson Junction
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- Siyuan Han
- Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA.
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- Yang Yu
- Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA.
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- Xi Chu
- Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA.
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- Shih-I Chu
- Department of Chemistry, University of Kansas, Lawrence, KS 66045, USA.
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- 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
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- Science
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Science 293 (5534), 1457-1459, 2001-08-24
American Association for the Advancement of Science (AAAS)
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キーワード
詳細情報 詳細情報について
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- CRID
- 1361981468952517248
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- ISSN
- 10959203
- 00368075
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- データソース種別
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- Crossref