用腔QED技术实现纠缠交换

Realization of Entanglement Swapping in Cavity QED

基于腔QED系统,提出一种纠缠交换的方案,不仅能实现没有直接相互作用的原子不同程度的纠缠,还能实现未知纠缠状态转移到没有直接相互作用的原子上去.在此方案中只对原子做独立测量,没有使用联合测量,原子跃迁频率与场模频率大失谐,场只是虚激发,腔场品质因子的要求比共振条件下大大降低.

We propose an entanglement swapping scheme in cavity QED. The different degree entanglement between atoms that never directly interacted can be realized ,the unknown entanglement state can be transferred on atoms that never directly interacted. In the scheme,the previously used joint measurement is not needed. Only single measurement on atom is needed in realizing the swapping process. During the interac- tion between atom and cavity,the cavity is only virtually excited and thus the scheme is insensitive to the cavity field states and cavity decay.