基于EPR对的任意四粒子Cluster类态全概率联合远程制备

Deterministic Joint Remote Preparation of Arbitrary Four-qubit Cluster-type Entangled State Using EPR Pairs

采用4个EPR(Einstein-Podolsky-Rosen)对作为量子信道,提出一种新的全概率联合远程制备任意四粒子Cluster类态方案。在这个新的方案中,一个制备者执行四粒子投影测量,另一个制备者对手中的粒子执行二粒子投影测量。然后,接收者对手中二粒子进行某种幺正操作,并分别对两个辅助粒子进行受控非门操作,从而最终得到需要制备的Cluster类态。与其他制备任意四粒子Cluster类态的全概率制备方案相比,所提协议效率较高,而且在实验上更经济可行。

Taking four EPR （Einstein-Podolsky-Rosen） pairs as quantum channel,a new protocol for deterministic joint remote preparation of four-particle cluster-type states was presented. In the protocol, one of the senders performs a four- qubit projective measurement, while the other performs a bipartite projective measurement. Afterwards, the receiver just adopts some appropriate unitary operations on his/her own two particles, and then respectively applies a controlled- NOT gate on two other auxiliary particles. As a result, he/she can obtain the desired state. Compared with other proto- cols for deterministic remote preparation of arbitrary four-particle cluster-type states, our protocol is more efficient, and it is economic and feasible in the physical experiment.