Single-atom entropy squeezing and quantum entanglement in Tavis--Cummings model with atomic motion

doi:10.1088/1674-1056/19/7/074207

Abstract We examine the single-atom entropy squeezing and the atom—field entanglement in a system of two moving two-level atoms interacting with a single-mode coherent field in a lossless resonant cavity. Our numerical calculations indicate that the squeezing period, the squeezing time and the maximal squeezing can be controlled by appropriately choosing the atomic motion and the field-mode structure. The atomic motion leads to a periodical time evolution of entanglement between the two-atom and the field. Moreover, there exists corresponding relation between the time evolution properties of the atomic entropy squeezing and that of the entanglement between the two atoms and the field.

Keywords: atomic entropy squeezing quantum reduced entropy Tavis--Cummings model atomic motion and field-mode structure

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PACS:	42.50.Dv	(Quantum state engineering and measurements)
	03.65.Ud	(Entanglement and quantum nonlocality)
	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)
	37.10.Vz	(Mechanical effects of light on atoms, molecules, and ions)

Fund: Project supported by the Science and Technology Program of Dezhou, Shandong Province, China (Grant No. 20080153) and the Scientific Research Fund of Dezhou University, China (Grant No. 07024).

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Zou Yan (邹艳) Single-atom entropy squeezing and quantum entanglement in Tavis--Cummings model with atomic motion 2010 Chin. Phys. B 19 074207

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[1]	Quantum entanglement between the two-mode fields and atomic entropy squeezing in the system of a moving atom interacting with two-mode entangled coherent field Zou Yan(邹艳) and Li Yong-Ping(李永平). Chin. Phys. B, 2009, 18(7): 2794-2800.
[2]	Entropy squeezing of a moving atom and control of noise of the quantum mechanical channel via the two-photon process Zhou Bing-Ju(周并举), Liu Xiao-Juan(刘小娟), Zhou Qing-Ping(周清平), and Liu Ming-Wei(刘明伟). Chin. Phys. B, 2007, 16(2): 420-428.
[3]	Preparation and control of entangled states in the two-mode coherent fields interacting with a moving atom via two-photon process Liu Xiao-Juan(刘小娟), Zhou Bing-Ju(周并举), Liu Ming-Wei (刘明伟), and Li Shou-Cun(李寿存). Chin. Phys. B, 2007, 16(12): 3685-3691.
[4]	Effect of an external radiation field on the properties of the atoms and cavity field in the two-atom Tavis-Cummings model Wang Zhong-Chun (王忠纯), Wang Qi (王琪), Zhang Yong-Sheng (张永生), Guo Guang-Can (郭光灿). Chin. Phys. B, 2005, 14(1): 137-143.

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