两纠缠二能级原子与单模光场相互作用的纠缠动力学过程研究 Dynamics of Entanglement of Two Entangled Two-Level Atoms Interacted with Single-Mode Field

在光原子相互作用系统中，考虑两二能级原子间的偶极–偶极相互作用对原子间纠缠动力学过程的影响。研究表明：原子间的偶极–偶极相互作用对量子纠缠(共生纠缠度)动力学振荡过程具有抑制作用，当偶极–偶极相互为零时，量子纠缠呈双周期振荡效果，当偶极–偶极相互作用增强时，振荡频率逐渐降低，当偶极–偶极相互作用远大于原子与库环境相互作用强度时，量子纠缠呈明显的余弦振荡，其振荡频率为 。 The influence of dipole-dipole interactions between the two two-level entangled atoms for dynamics of quantum entanglement is studied in the system of matter-field interaction in quantum optics. The results show that the dipole-dipole interaction is capable to suppress dynamics of quantum entanglement (concurrence). If we have no regard for the dipole-dipole interaction, the dynamic of quantum entanglement is periodic oscillation including two different frequencies. Meanwhile, the frequency is decreasing with the increasing of the dipole-dipole interaction. When this interaction is much larger than that between the atoms and independent the single-mode field (modeled as extern environment), the process of dynamic of quantum entanglement is cosine oscillation with frequency .