N+2原子受简并双光子作用时的纠缠动力学

摘要

The entanglement dynamics of N + 2 atoms (in which N atoms interact resonantly with light field, two atoms interact non-resonantly with light field)interacting with degenerate two-photos is investigated and an analytical expression of concurrence for 2 resonant atoms is obtained. The results show: the time evolution of the entanglement of N+2 atoms interacting with degenerate two-photons displays a typical collapse-revival structure, and the collapse-revival period of the concurrence of N + 2 atoms is smaller than that of N + 2 atoms interacting with single photon. In addition, the relative coupling coefficient r of N + 2 atoms with light field has obvious effect on the collapse-revival characteristic.%研究了N+2(其中N个原子与光场非共振作用,2个原子与光场共振作用)原子受简并双光子作用的纠缠动力学,得到2个共振原子的纠缠度的解析表达式.结果表明:在简并双光子作用下,纠缠度的时间演化出现有规则的崩塌回复现象,并且崩塌回复周期比单光子作用下时要短.此外,N+2原子与光场间的相对耦合系数对简并双光子情形下的纠缠度有更灵敏的影响.