求出了初态为x态时Tavis-Cummings模型中两个有偶极相互作用原子的共生纠缠度,分析了偶极相互作用对纠缠的时间演化和纠缠突然死亡(ESD)的影响,以及共生纠缠度与原子间相互作用能的关系.结果表明,偶极相互作用对原子间的纠缠和ESD有显著的影响,会改变纠缠度的振荡周期和振幅,使出现ESD的时间间隔和次数减少.原子间的共生纠缠度与原子间相互作用能有着明显的对应关系,且与原子的初态有关.
The concurrence of the two atoms with dipole-dipole interaction in the Tavis-Cummings model in an initial x state is derived. The influence of the dipole-dipole interaction on the entanglement time evolution and the entanglement sudden death (ESD) is analysed. The relation between the concurrence and the atomic interaction energy is investigated. The results show that the dipole-dipole interaction affects the concurrence and ESD remarkably, leads periods and amplitudes 6f the concurrence oscillation to change and time interval and number of the ESD to decrease. The relation between the concurrence and interaction energy relies on initial states of the atoms.
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