基于非最大纠缠GHZ态的一种量子信息集中方案

摘要

This paper proposed a scheme of remote information concentration via non-maximally entangled four-qubit GHZ state as quantum channel.Firstly,it constructed a whole system between an unknown cloning state and the quantum channel.Then,three separated parties performed Bell state measurement on their qubits respectively.After performing measurement,every one told the recuperator the measurement outcomes by classical information.Finally,the information was concentrated back to a single qubit with some appropriate measurements (projection measurement or POVM measurement).At the same time,this paper discussed the security and efficiency of the scheme and compared it with references[1,2] in detail.%提出了一种以非最大纠缠的四粒子GHZ态作为量子信道的概率性量子信息集中方案.方案首先将未知的克隆态与量子信道构造系统态;其次,空间分离的三方对手中的粒子进行Bell测量,并将测量结果通过经典通信告诉信息恢复者;最后,信息重建者作适当的测量(投影测量或者POVM测量),将信息集中回单量子态,从而实现量子信息集中.进而讨论了方案的安全性和效率,并与文献[1,2]从多角度进行了比较.