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Chin. Phys. B, 2013, Vol. 22(1): 010307    DOI: 10.1088/1674-1056/22/1/010307
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Continuous variable entanglement generation in coupled cavities

Pan Gui-Xiaa b, Xiao Rui-Jiea, Zhou Linga
a School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China;
b School of Science, Anhui University of Science and Technology, Huainan 232001, China
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      Published:  01 December 2012
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

Cite this article: 

Pan Gui-Xia, Xiao Rui-Jie, Zhou Ling Continuous variable entanglement generation in coupled cavities 2013 Chin. Phys. B 22 010307

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