基于腔QED的多用户间的多原子量子信道的建立

提出基于腔QED技术的多用户间的多原子W态和GHZ态量子信道的建立方案.在量子网络的空闲时段，各个用户和量子交换机共享EPR对.量子交换机通过原子和腔场的相互作用将两个EPR对制备成W态，再与另一个EPR对进行纠缠交换，经过直接测量后为用户建立三原子W态量子信道；同时讨论了四用户间的W态量子信道的建立方案.量子交换机对三个EPR对进行纠缠交换，将三个原子同时与腔场作用，经过直接测量后为用户建立三原子GHZ态量子信道；并将此方法推广到N个用户间的GHZ态量子信道的建立. 关键词： 腔QED 量子信道 量子交换机 纠缠交换

Establishment of multi-user quantum channel of entangled multi-atom based on cavity QED

We present a scheme for establishing a multi-user quantum channel of multi-atom entangled W states and GHZ states based on cavity QED. Each user has shared EPR pairs with quantum switch during the leisure time of quantum network. An entangled W state is prepared base on two EPR pairs in cavity field by quantum switch at first，and entanglement swapping and direct measurement is operated on the other EPR pairs to establish a quantum channel of W states between three users. In the same way, we can establish a quantum channel of four atoms entangled W state. Three atoms of quantum switch simultaneously interact with cavity field to establish a quantum channel of entangled GHZ states between three users after direct measurement, and we also establish an N users’ quantum channel of entangled GHZ states.