Preparation of steady-state entanglement via a laser-excited resonant interaction

doi:10.1088/1674-1056/21/8/084206

Abstract In this paper we propose a scheme, in which two-mode entanglement in a steady state is produced by using two lasers to resonantly drive a single four-level atom embedded inside a two-mode optical cavity. In this scheme, atomic coherence induced by a classical laser plays an important role in the process of preparing the entangled state. With the coupling of a strong control field, direct two-photon transition is generated and the relatively weak pump field induces the parametric interaction between two photons, which makes them entangled with each other. By numerical calculation, we find that the degree of entanglement depends strongly on the Rabi frequencies of the classical laser fields and the cavity losses.

Keywords: two-mode entanglement atomic coherence resonant interaction

Received: 03 January 2012
Revised: 08 February 2012
Accepted manuscript online:

PACS:	42.50.Dv	(Quantum state engineering and measurements)
	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)
	42.50.Pq	(Cavity quantum electrodynamics; micromasers)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11047182, 11165008, and 11065007), the Natural Science Foundation of Jiangxi Province, China (Grant Nos. 20114BAB202001 and 2010GQW0011), and the Science Foundation of East China Jiaotong University, China (Grant Nos. 10JC03 and 10JC06).

Corresponding Authors: Chen Ai-Xi
E-mail: aixichen@ecjtu.jx.cn

Cite this article:

Cheng Guang-Ling (程广玲), Chen Ai-Xi (陈爱喜), Geng Jun (耿珺), Zhong Wen-Xue (钟文学), Deng Li (邓黎) Preparation of steady-state entanglement via a laser-excited resonant interaction 2012 Chin. Phys. B 21 084206

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