Rise of quantum correlations in non-Markovian environments in continuous-variable systems

doi:10.1088/1674-1056/23/7/070303

›› 2014, Vol. 23 ›› Issue (7): 70303-070303.doi: 10.1088/1674-1056/23/7/070303

Rise of quantum correlations in non-Markovian environments in continuous-variable systems

刘辛, 吴薇

Department of Physics, School of Science, Wuhan University of Technology, Wuhan 430070, China

收稿日期:2014-01-30 修回日期:2014-03-23 出版日期:2014-07-15 发布日期:2014-07-15
基金资助:
Project supported by the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2013-Ia-032 and WUT:2014-Ia-026).

Rise of quantum correlations in non-Markovian environments in continuous-variable systems

Liu Xin (刘辛), Wu Wei (吴薇)

Department of Physics, School of Science, Wuhan University of Technology, Wuhan 430070, China

Received:2014-01-30 Revised:2014-03-23 Online:2014-07-15 Published:2014-07-15
Contact: Liu Xin E-mail:lxheroes@126.com
About author:03.65.Yz; 03.65.Ta; 03.67.Mn
Supported by:
Project supported by the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2013-Ia-032 and WUT:2014-Ia-026).

摘要/Abstract

摘要： We investigate the time evolution of quantum correlations, which are measured by Gaussian quantum discord in a continuous-variable bipartite system subject to common and independent non-Markovian environments. Considering an initial two-mode Gaussian symmetric squeezed thermal state, we show that quantum correlations can be created during the non-Markovian evolution, which is different from the Markovian process. Furthermore, we find that the temperature is a key factor during the evolution in non-Markovian environments. For common reservoirs, a maximum creation of quantum correlations may occur under an appropriate temperature. For independent reservoirs, the non-Markovianity of the total system corresponds to the subsystem whose temperature is higher. In both common and independent environments, the Gaussian quantum discord is influenced by the temperature and the photon number of each mode.

关键词: quantum correlation, non-Markovian environment, continuous-variable systems

Abstract: We investigate the time evolution of quantum correlations, which are measured by Gaussian quantum discord in a continuous-variable bipartite system subject to common and independent non-Markovian environments. Considering an initial two-mode Gaussian symmetric squeezed thermal state, we show that quantum correlations can be created during the non-Markovian evolution, which is different from the Markovian process. Furthermore, we find that the temperature is a key factor during the evolution in non-Markovian environments. For common reservoirs, a maximum creation of quantum correlations may occur under an appropriate temperature. For independent reservoirs, the non-Markovianity of the total system corresponds to the subsystem whose temperature is higher. In both common and independent environments, the Gaussian quantum discord is influenced by the temperature and the photon number of each mode.

Key words: quantum correlation, non-Markovian environment, continuous-variable systems

中图分类号: (Decoherence; open systems; quantum statistical methods)

03.65.Yz

03.65.Ta (Foundations of quantum mechanics; measurement theory) 03.67.Mn (Entanglement measures, witnesses, and other characterizations)

刘辛, 吴薇. Rise of quantum correlations in non-Markovian environments in continuous-variable systems[J]. , 2014, 23(7): 70303-070303.

Liu Xin (刘辛), Wu Wei (吴薇). Rise of quantum correlations in non-Markovian environments in continuous-variable systems[J]. Chin. Phys. B, 2014, 23(7): 70303-070303.

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Rise of quantum correlations in non-Markovian environments in continuous-variable systems

Rise of quantum correlations in non-Markovian environments in continuous-variable systems

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