多体GHZ态的远程制备

Remote Preparation of Multi-particle GHZ-class State

提出了两种制备多体GHZ态的方案。为了改造量子信道,在两个方案中,均使用了一个辅助粒子。第一种方案,利用辅助粒子将量子信道制备到与所要制备的态相适应的参数上;而在第二种方案中,先利用辅助粒子将量子信道改造成最大纠缠态,然后再制备所需要的量子态。研究表明,两种方案所需的经典信息相同,均为1个比特,在相同的条件下,第一种方案具有较高的成功概率。

In this paper,we investigate two protocols of remote preparation of multipartite GHZ state.In order to promote the quantum channel,we introduce an auxiliary particle in both protocols.In the first protocol,with the aid of the auxiliary particle,the quantum parameter is changed to be the most suitable to the state to be remotely prepared,and then the RSP protocol is achieved.In the second protocol,the quantum is firstly changed into the maximally entanglement,and then the RSP is implemented.Our result shows that one bit classical communication cost is enough in both two protocols respectively,and the first RSP protocol is more likely to be achieved than the second one.