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

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

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.

Keywords: quantum correlation non-Markovian environment continuous-variable systems

Received: 30 January 2014
Revised: 23 March 2014
Accepted manuscript online:

PACS:	03.65.Yz	(Decoherence; open systems; quantum statistical methods)
	03.65.Ta	(Foundations of quantum mechanics; measurement theory)
	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)

Fund: Project supported by the Fundamental Research Funds for the Central Universities, China (Grant Nos. 2013-Ia-032 and WUT:2014-Ia-026).

Corresponding Authors: Liu Xin
E-mail: lxheroes@126.com

About author: 03.65.Yz; 03.65.Ta; 03.67.Mn

Cite this article:

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

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