中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5336-5341.doi: 10.1088/1674-1056/18/12/036
方卯发1, 胡要花1, 蔡建武2, 吴琴3
Wu Qin(吴琴)a)†, Fang Mao-Fa(方卯发)b), Cai Jian-Wu(蔡建武)c), and Hu Yao-Hua(胡要花)b)
摘要: Extending the double Jaynes--Cummings model to a more complicated case where the mode--mode competition is considered, we investigate the entanglement character of two isolated atoms by means of concurrence, and discuss the dependence of atom--atom entanglement on the different initial state and the relative coupling strength between the atom and the corresponding cavity field. The results show that the amplitude and the period of the atom--atom entanglement evolution can be controlled by the choice of initial state and relative coupling strength, respectively. We find that the phenomenon of entanglement sudden death (ESD) is sensitive to the initial conditions. The length of the time interval for zero entanglement depends not only on the initial degree of entanglement between two atoms but also on the relative coupling strength of atom--field interaction. The ESD effect can be weakened by enhancing the mode--mode competition between the three- and single-photon processes.
中图分类号: (Quantum state engineering and measurements)