Entanglement and disentanglement in the nonlinear interaction between squeezing vacuum state field and atom
Huang Yan-Xia, Zhao Peng-Yi, Xi Huang, Mingsheng Zhan, (1)湖北师范学院物理系，黄石 435002;中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉 430071; (2)中国科学院近代物理研究所，兰州 730000; (3)中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室，武汉 430071 · Acta Physica Sinica · 2004
The properties of the entanglement in the intensity-dependent coupling interaction between squeezing vacuum state field and atom with an additional Kerr medium are investigated by using the von Neumann entropy. The influences of nonlinear interaction intensity of Kerr medium and the squeezing degree of initial squeezing vacuum state field on the entanglement of the quantum system are discussed. The results show that the nonlinear interaction of Kerr medium can result in the generation of the maximally entangled state, disentangled-free state or disentangled state, and the degree of entanglement is stationary.