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Sudden death of entanglement of two atoms interacting with thermal fields |
Luo Cheng-Li(罗成立)†, Miao Long(缪龙), Zheng Xiao-Lan(郑小兰), Chen Zi-Hong(陈子翃), and Liao Chang-Geng(廖长庚) |
Department of Physics, Fuzhou University, Fuzhou 350002, China |
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Abstract We investigate the entanglement dynamics of two initially entangled atoms each interacting with a thermal field. We show that the two entangled atoms become completely disentangled in a finite time and that the lost information cannot return to the atomic system when the mean photon number of the thermal field exceeds a critical value (3.3584), even though the whole system is lossless. Then we study how the detuning between the atomic transition frequency and the field frequency and the disparity between two coupling rates would affect the evolution of the entanglement of the atomic system.
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Received: 09 September 2010
Revised: 02 March 2011
Accepted manuscript online:
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PACS:
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03.65.Ud
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(Entanglement and quantum nonlocality)
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42.50.Pq
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(Cavity quantum electrodynamics; micromasers)
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42.50.Dv
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(Quantum state engineering and measurements)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10974028), the Natural Science Foundation of
Fujian Province of China (Grant No. 2009J06002), and the Funds from the State Key Laboratory Breeding Base of Photocatalysis. |
Cite this article:
Luo Cheng-Li(罗成立), Miao Long(缪龙), Zheng Xiao-Lan(郑小兰), Chen Zi-Hong(陈子翃), and Liao Chang-Geng(廖长庚) Sudden death of entanglement of two atoms interacting with thermal fields 2011 Chin. Phys. B 20 080303
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