一种全概率联合远程制备四粒子cluster类态的方案

Scheme for joint remote preparation of four-qubit cluster-type states with unit success probability

为了解决四粒子cluster类态的联合远程制备问题,提出了一种新的制备方法。采用两个GreenbergerHorne-Zeilinger(GHZ)态作为量子信道,每个制备者只需依次执行2×2维Hilbert空间二粒子投影测量。在接收端,接收者将对手中两个粒子进行某种酉操作,并分别对两个辅助粒子进行受控非门操作,从而最终获取需制备的cluster类态。经分析,该协议可实现全概率制备,即Psuc=1,并且效率比同类协议更高,因而更加经济、实用。

For joint remote preparation of four-particle cluster-type states, this paper proposed a new solution. In this solu- tion, it used two GHZ states as quantum channels, and just required each senders to perform orderly a bipartite projective measurement in 2 ×2-dimensional Hilbert space. At the receiving end, the receiver needed to adopt some appropriate unitary operation to his/her own two particles, and then respectively applied a controlled-NOT gates to the two auxiliary particles. As a result, he/she could obtain the original state. Analysis shows this protocol can really achieve the unit success probability, i. e. , Psuc = 1, and the efficiency is higher than other relevant protocols. Therefore, it is more economical and practical.