非旋波近似下两纠缠原子的纠缠特性

采用了相干态正交化法研究了耦合强度以及偶极相互作用对Tavis-Cummings模型中两原子的纠缠的影响.与旋波近似比较发现,在弱耦合强度下,非旋波近似下两原子间的纠缠与旋波近似下的结果符合得很好,在强耦合区,原子之间的纠缠出现了突然死亡现象.研究同时发现耦合强度越大,原子间处于可分离态的时间越长,表明了原子间处于退纠缠的时间的长短是依赖于原子-光场的耦合强度的.而考虑了偶极相互作用时,随着偶极-偶极相互作用的加强,原子间的纠缠也将被加强.

Entanglement Properties of Two Entangled Atoms Without Rotating Wave Approximation

In this paper, the influnences of dipole-dipole interaction and large coupling strength on the entanglement between two atoms in the Tavis-Cummings model have been discussed. The results shows that the phenomenon of the entanglement sudden death and revival appears when the coupling sthength is large enough, and the longer the state stay in the disentangled separable state with increace of coupling strength when take the anti-rotating wave term into account. The entanglement between two atoms can be enhanced when the strength of dipole-dipole interaction is large enough.