Role of initial system-bath correlation on coherence trapping

We study the coherence trapping of a qubit correlated initially with a non-Markovian bath in a pure dephasing channel. By considering the initial qubit-bath correlation and the bath spectral density, we find that the initial qubit-bath correlation can lead to a more efficient coherence trapping than...

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Published inScientific reports Vol. 5; no. 1; p. 13359
Main Authors Zhang, Ying-Jie, Han, Wei, Xia, Yun-Jie, Yu, Yan-Mei, Fan, Heng
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 25.08.2015
Nature Publishing Group
Subjects
639/766/483/481
639/766/483/640
Evolution
Humanities and Social Sciences
Laboratories
multidisciplinary
Open systems
Physics
Science
Trapping
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Summary:We study the coherence trapping of a qubit correlated initially with a non-Markovian bath in a pure dephasing channel. By considering the initial qubit-bath correlation and the bath spectral density, we find that the initial qubit-bath correlation can lead to a more efficient coherence trapping than that of the initially separable qubit-bath state. The stationary coherence in the long time limit can be maximized by optimizing the parameters of the initially correlated qubit-bath state and the bath spectral density. In addition, the effects of this initial correlation on the maximal evolution speed for the qubit trapped to its stationary coherence state are also explored.
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ISSN:2045-2322
2045-2322
DOI:10.1038/srep13359