Quantum correlation dynamics of three non-coupled two-level atoms in different reservoirs

doi:10.1088/1674-1056/22/2/020309

Abstract Time evolution dynamics of three non-coupled two-level atoms independently interacting with their reservoirs is solved exactly by considering a damping Lorentzian spectral density. For three atoms initially prepared in Greenberger-Horne-Zeilinger-type state, quantum correlation dynamics in Markovian reservoir is compared with that in non-Markovian reservoir. By increasing detuning quantity in non-Markovian reservoir, three-atom correlation dynamics measured by negative eigenvalue presents a trapping phenomenon which provides long-time quantum entanglement. Then we compare the correlation dynamics of three atoms with that of two atoms, measured by quantum entanglement and quantum discord for initial robuster-entangled type state. The result further confirms that quantum discord is indeed different from quantum entanglement in identifying quantum correlation of many bodies.

Keywords: quantum correlation dynamics Lorentzian spectral density Markovian and non-Markovian reservoirs

Received: 04 April 2012
Revised: 06 July 2012
Accepted manuscript online:

PACS:	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)
	03.65.Ud	(Entanglement and quantum nonlocality)
	03.65.Yz	(Decoherence; open systems; quantum statistical methods)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11104113 and 11264011) and the Natural Science Foundation of Hunan Province, China (Grant Nos. 09JJ6011 and 11JJ6007).

Corresponding Authors: Wang Xiao-Yun, Ding Bang-Fu
E-mail: wxyyun@163.com; dbf1982@126.com

Cite this article:

Wang Xiao-Yun (王小云), Ding Bang-Fu (丁邦福), Zhao He-Ping (赵鹤平) Quantum correlation dynamics of three non-coupled two-level atoms in different reservoirs 2013 Chin. Phys. B 22 020309

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Quantum correlation dynamics of three non-coupled two-level atoms in different reservoirs

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