Effect of mode-mode competition on atom－atom entanglement

doi:10.1088/1674-1056/19/2/024209

Abstract A system consisting of two atoms interacting with a two-mode vacuum is considered, where each atom is resonant with the two cavity modes through two different competing transitions. The effect of mode--mode competition on the atom--atom entanglement is investigated. We find that the entanglement between the two atoms can be induced by the mode--mode competition. For the initial atomic state $|\varPsi(0)\rangle$, whether the atoms are initially separated or entangled, a large or even maximal entanglement between them can be obtained periodically by introducing the mode--mode competition. For the initial atomic state $|\varPhi(0)\rangle$, the strong mode--mode competition can prevent the two atoms entangled initially from suffering entanglement sudden death; besides, it makes them in a more stable and longer-lived entanglement than in the non-competition case.

Keywords: mode--mode competition concurrence entanglement sudden death

Received: 16 April 2009
Revised: 05 June 2009
Accepted manuscript online:

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)
	32.80.-t	(Photoionization and excitation)

Fund: Project supported by the National Natural Science Foundation of China (Grant No.~10374025), the Foundation of Education Bureau of Hunan Province, China (Grant Nos.~06A038 and 06C080) and the Zhanjiang Projects for Development of Science and Technology, China (Grant No.~2008C10019).

Cite this article:

Wu Qin(吴琴), Fang Mao-Fa(方卯发), and Cai Jian-Wu(蔡建武) Effect of mode-mode competition on atom－atom entanglement 2010 Chin. Phys. B 19 024209

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