Decoherence of Josephson charge qubit in non-Markovian environment

In this paper we investigate the decoherence of Josephson charge qubit (JCQ) by using a time-nonlocal (TNL) dynamical method. Three kinds of environmental models, described with Ohmic, super-Ohmic, and sub-Ohmic spectral density functions are considered. It is shown that the TNL method can effective...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2016-05, Vol.489, p.12-16
Main Authors: Qiu, Qing-Qian, Zhou, Xing-Fei, Liang, Xian-Ting
Format: Article
Language:English
Subjects:
Charge
Condensed matter
Decoherence
Density
Environment models
Josephson charge qubit
Mathematical models
Non-Markov
Ohmic
Qubits (quantum computing)
Spectra
Time-nonlocal dynamics
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Summary:In this paper we investigate the decoherence of Josephson charge qubit (JCQ) by using a time-nonlocal (TNL) dynamical method. Three kinds of environmental models, described with Ohmic, super-Ohmic, and sub-Ohmic spectral density functions are considered. It is shown that the TNL method can effectively include the non-Markovian effects in the dynamical solutions. In particular, it is shown that the sub-Ohmic environment has longer correlation time than the Ohmic and super-Ohmic ones. And the Markovian and non-Markovian dynamics are obviously different for the qubit in sub-Ohmic environment.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2016.02.024