单模真空场中两个耦合二能级原子纠缠的时间演化特性(英文)

Time evolution of two coupling two-level atoms entanglement in a single-mode vacuum field

研究了单模真空场中两个耦合二能级原子纠缠特性。运用密度矩阵方法,得到两能级原子约化密度矩阵。借助于共生纠缠度,研究两个耦合二能级原子纠缠的时间演化规律,讨论原子间偶极作用对原子间纠缠的影响。结果表明:原子间的偶极作用导致纠缠度的减少和时间演化周期的增加。

The time evolution of two coupling two-level atoms entanglement in a single-mode vacuum field is explored. The two-level atoms＇ reducible density matrix is obtained. The entanglement between two two-level atoms is investigated by virtue of concurrence. The influences of the atomic dipole-dipole interaction on the entanglement of the two atoms a^e discussed. It is shown that the atomic dipole-dipole interaction leads to the decrease of the degrees of the entanglement and the increase of its time evolution period. In order to prepare entangled state, the influence of the atomic dipole-dipole interaction should be reduced.