任意二粒子纠缠态的受控量子通信

Controlled quantum communication of arbitrary two-particle entangled states

为了解决任意二量子通信问题,首先给出了五粒子和七粒子纠缠态的构造方法,并提供了它们的量子线路图。其次,以该五粒子纠缠态为量子信道,提出一个任意二粒子未知量子态的受控隐形传态协议。该协议在监察者Charlie的控制下,Alice进行四粒子投影测量和经典通信,Bob采用简单酉变换就能以100%的概率成功重构一个任意二粒子纠缠态。最后,利用七粒子纠缠态为量子信道,提出了任意二粒子纠缠态的联合受控远程制备方案。在此方案中,发送者Alice用自己掌握被制备态的部分信息构造测量基,发送者Bob采用前馈测量策略,接收者Diana在监控者Charlie的帮助下,通过简单幺正变换就能确定性地恢复原始态。

In order to solve the problem for arbitrary two-qubit quantum communication,this paper firstly gave the construction methods of five-and seven-particle entangled states,and provided their quantum circuit diagrams.Next,taking this entangled five-particle state as quantum channel,this paper proposed a controlled teleportation protocol for an arbitrary two-particle unknown quantum state.Under the control of the supervisor Charlie,Alice carried out four-particle projective measurement and classical communication,and Bob could successfully reconstruct an arbitrary two-particle entangled state with 100%probability by using simple unitary transformation.Finally,the paper put forward a joint controlled remote preparation scheme for an arbitrary two-particle entangled state by using the seven-particle entangled state as quantum channel.In this scheme,the sender Alice constructed a measurement basis with some information of the prepared state,which were had by her.The sender Bob used feed-forward measurement strategy,and the receiver Diana,with the help of the supervisor Charlie,could restore the original state deterministically by simple unitary transformation.