一种全概率联合远程制备四粒子cluster类态的方案

摘要

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.%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Greenberger-Horne-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。