Quantum correlations between two non-interacting atoms under the influence of a thermal environment

doi:10.1088/1674-1056/21/1/014203

中国物理B ›› 2012, Vol. 21 ›› Issue (1): 14203-014203.doi: 10.1088/1674-1056/21/1/014203

Quantum correlations between two non-interacting atoms under the influence of a thermal environment

胡要花, 王军强

College of Physics and Electronic Information, Luoyang Normal University, Luoyang 471022, China

收稿日期:2011-05-27 修回日期:2011-06-19 出版日期:2012-01-15 发布日期:2012-01-20
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 60978011 and 10905028), the Program for Science and Technology Department of Henan Province, China (Grant No. 102300410050), and the Cultivation Fund of Luoyang Normal Colle

Quantum correlations between two non-interacting atoms under the influence of a thermal environment

Hu Yao-Hua(胡要花)^† and Wang Jun-Qiang(王军强)

College of Physics and Electronic Information, Luoyang Normal University, Luoyang 471022, China

Received:2011-05-27 Revised:2011-06-19 Online:2012-01-15 Published:2012-01-20
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 60978011 and 10905028), the Program for Science and Technology Department of Henan Province, China (Grant No. 102300410050), and the Cultivation Fund of Luoyang Normal Colle

摘要/Abstract

摘要： By considering a double Jaynes-Cummings model, we investigate the dynamics of quantum correlations, such as the quantum discord and the entanglement, for two atoms in their respective noisy environments, and study the effect of the purity and the cavity temperature on the quantum correlations. The results show that the entanglement suffers sudden death and revival, however the quantum discord can still reveal the quantum correlations between the two atoms in the region where the entanglement is zero. Moreover, when the temperature of each cavity is high the entanglement dies out in a short time, but the quantum discord still survives for quite a long time. It means that the quantum discord is more resistant to environmental disturbance than the entanglement at higher temperatures.

关键词: quantum discord, entanglement, double Jaynes-Cummings model

Abstract: By considering a double Jaynes-Cummings model, we investigate the dynamics of quantum correlations, such as the quantum discord and the entanglement, for two atoms in their respective noisy environments, and study the effect of the purity and the cavity temperature on the quantum correlations. The results show that the entanglement suffers sudden death and revival, however the quantum discord can still reveal the quantum correlations between the two atoms in the region where the entanglement is zero. Moreover, when the temperature of each cavity is high the entanglement dies out in a short time, but the quantum discord still survives for quite a long time. It means that the quantum discord is more resistant to environmental disturbance than the entanglement at higher temperatures.

Key words: quantum discord, entanglement, double Jaynes-Cummings model

中图分类号: (Quantum optics)

42.50.-p

03.67.Mn (Entanglement measures, witnesses, and other characterizations)

胡要花, 王军强. Quantum correlations between two non-interacting atoms under the influence of a thermal environment[J]. 中国物理B, 2012, 21(1): 14203-014203.

Hu Yao-Hua(胡要花) and Wang Jun-Qiang(王军强) . Quantum correlations between two non-interacting atoms under the influence of a thermal environment[J]. Chin. Phys. B, 2012, 21(1): 14203-014203.

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Quantum correlations between two non-interacting atoms under the influence of a thermal environment

Quantum correlations between two non-interacting atoms under the influence of a thermal environment

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