Intrinsic Decoherence of a Two-Atom System with Dipole--Dipole

We investigate the effect of dipole-dipole interaction on the intrinsic decoherence of a system which consists of two two-level atoms and an optical cavity. The entanglement of the system is calculated by making use of concurrence. Our results show that the appropriate choice for the coupling constant Ω of dipole-dipole interaction can restrain the intrinsic deeoherenee of the system. We also find a special phenomenon. No matter what the value of γ is, the concurrence of system slowly increases and cannot exceed 0.71 when Ω= 1.     

偶极相互作用存在的前提下Kerr介质对系统纠缠度的影响

在Milburn方程的支配下,研究了在偶极相互作用存在的前提下Kerr介质对两原子系统纠缠度的影响.通过concurrence计算了系统的纠缠度,讨论了concurrence随时间的振荡情况.结果表明,在偶极相互作用存在的前提下,通过适当选取Kerr介质的耦合常数χ,可以更好地提高系统的纠缠度,从而有效地抑制内禀消相干的作用.同时还发现在增大纠缠度方面,对于Ω的不同取值,倍数Λ的取值也不同. 关键词： Milburn理论 偶极相互作用 Kerr介质 concurrence