Control of entanglement between two atoms by the Stark shift

doi:10.1088/1674-1056/19/7/070302

Abstract Considering a quantum model consisting of two effective two-level atoms and a single-mode cavity, this paper investigates the entanglement dynamics between the two atoms, and studies the effect of the Stark shift on the entanglement. The results show that, on the one hand the atom—atom entanglement evolves periodically with time and the periods are affected by the Stark shift; on the other hand, the two atoms are not disentangled at any time when the Stark shift is considered, and for large values of the Stark shift parameter, the two atoms can remain in a stationary entangled state. In addition, for the initially partially entangled atomic state, the atom—atom entanglement can be greatly enhanced due to the presence of Stark shift. These properties show that the Stark shift can be used to control entanglement between two atoms.

Keywords: entanglement Stark shift control

Accepted manuscript online:

PACS:	42.50.Dv	(Quantum state engineering and measurements)
	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)
	37.10.Vz	(Mechanical effects of light on atoms, molecules, and ions)
	32.60.+i	(Zeeman and Stark effects)
	32.80.-t	(Photoionization and excitation)
	03.65.Ud	(Entanglement and quantum nonlocality)

Fund: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 10905028), the Natural Science Foundation of Hunan Province of China (Grant No. 07JJ3013), the Program for Science and Technology Department of Henan Province of China (Grant No. 102300410050) and by the Foundation of Hunan Provincial Education Department of China (Grant No. 06A038).

Cite this article:

Hu Yao-Hua(胡要花) and Fang Mao-Fa(方卯发) Control of entanglement between two atoms by the Stark shift 2010 Chin. Phys. B 19 070302

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