Journal
ANNALS OF PHYSICS
Volume 377, Issue -, Pages 484-492Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.aop.2017.01.008
Keywords
Quantum coherence; Quantum correlation; Fluctuating massless scalar field; Dynamics
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Funding
- National Natural Science Foundation of China [61502179]
- Natural Science Foundation of Guangdong Province of China [2014A030310265]
- Science Foundation for Young Teachers of Wuyi University [2015zk01]
- State Scholarship Fund of the China Scholarship Council
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In this article, the dynamics of quantum correlation and coherence for two atoms interacting with a bath of fluctuating massless scalar field in the Minkowski vacuum is investigated. We firstly derive the master equation that describes the system evolution with initial Bell-diagonal state. Then we discuss the system evolution for three cases of different initial states: non-zero correlation separable state, maximally entangled state and zero correlation state. For non-zero correlation initial separable state, quantum correlation and coherence can be protected from vacuum fluctuations during long time evolution when the separation between the two atoms is relatively small. For maximally entangled initial state, quantum correlation and coherence overall decrease with evolution time. However, for the zero correlation initial state, quantum correlation and coherence are firstly generated and then drop with evolution time; when separation is sufficiently small, they can survive from vacuum fluctuations. For three cases, quantum correlation and coherence first undergo decline and then fluctuate to relatively stable values with the increasing distance between the two atoms. Specially, for the case of zero correlation initial state, quantum correlation and coherence occur periodically revival at fixed zero points and revival amplitude declines gradually with increasing separation of two atoms. (C) 2017 Elsevier Inc. All rights reserved.
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