Abstract In a system with a moving V-type three-level atom interacting with the SU(1,1)-related coherent fields, we investigate the entanglement between the moving three-level atom and the SU(1,1)-related coherent fields by using the quantum-reduced entropy, and that between the SU(1,1)-related coherent fields by using the quantum relative entropy of entanglement. It is shown that the two kinds of entanglement are dependent on the atomic motion and exhibit the periodic evolution with a period of $2\pi/p$. The maximal atom--field qutrit entanglement state can be prepared, and the entanglement preservation of the SU(1,1)-related coherent fields can be realized in the interacting process via the appropriate selection of system parameters and interaction time.
Received: 29 May 2006
Revised: 25 August 2006
Accepted manuscript online:
Fund: Project supported by the National Natural Science
Foundation of China (Grant No 10374025) and by Hunan Provincial
Natural Science Foundation of China (Grant No~06JJ4003).
Cite this article:
Hu Yao-Hua(胡要花), Fang Mao-Fa(方卯发), and Liao Xiang-Ping(廖湘萍) Quantum entanglement in the system of a moving V-type three-level atom interacting with the SU(1,1)-related coherent fields 2007 Chinese Physics 16 1344
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