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论文类型：期刊论文

发表时间：2013-01-01

发表刊物：CHINESE PHYSICS B

收录刊物：SCIE、EI、ISTIC、Scopus

卷号：22

期号：1

ISSN号：1674-1056

关键字：continuous variable entanglement; coupled cavities; nondegenerate parametric down conversion; cavity dissipation

摘要：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 the creation (annihilation) operator of the 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 the entanglement condition, and show that the system provides us an advantage in achieving a larger photon number with better entanglement. We also discuss the dissipation of the cavities affecting the entanglement.