Continuous variable entanglement generation in coupled cavities

doi:10.1088/1674-1056/22/1/010307

Abstract We investigate continuous variable entanglement produced in two distant coupled cavities, in which two four-level atoms are driven by classical fields respectively. Under the large detuning condition, an effective Hamiltonian containing the square of creation (annihilation) operator of cavity field is derived. Due to the nonlinearity, entanglement formally created by the beam splitter type interaction is transformed into the nondegenerate parametric down conversion type. Employing the operator algebraic method, we study the time evolution of entanglement condition, and show that the system provides us advantage in achieving a larger photon number with better entanglement. We also discuss the dissipation of the cavities affecting the entanglement.

Keywords: continuous variable entanglement coupled cavities nondegenerate parametric down conversion cavity dissipation

Received: 11 June 2012
Revised: 16 July 2012
Accepted manuscript online:

PACS:	03.67.Mn	(Entanglement measures, witnesses, and other characterizations)
	42.50.Dv	(Quantum state engineering and measurements)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11074028).

Corresponding Authors: Zhou Ling
E-mail: Zhlhxn@dlut.edu.cn

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Pan Gui-Xia (潘桂侠), Xiao Rui-Jie (肖瑞杰), Zhou Ling (周玲) Continuous variable entanglement generation in coupled cavities 2013 Chin. Phys. B 22 010307

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