利用五粒子纠缠态作为量子信道, 实现四粒子W态量子信息的分离。 发送者Alice发送2、5粒子给Bob, 发送3粒子给Charlie。Alice对手中的六个粒子进行von-Neumann测量, 把测量结果告诉Charlie和Bob, 控制者Charlie对手中的单粒子进行投影测量, 再把测量结果告诉Bob, Bob根据 手中结果对手中的二粒子进行适当的幺正变换, 加两个辅助粒子, 再进行适当的量子门操作, 就可重建欲发送的四粒子W态, 该方案成功概率100%, 而且传输粒子较少, 易于实现。

Using a five-particle entangled state as quantum channel, the separation of quantum information of four particles W state was achieved. The sender Alice sends 2, 5 particles to Bob and sends 3 particle to Charlie. The sender Alice conducts von-Neumann measurement to six particles in hand and tells Charlie and Bob measurement results. The controller Charlie makes projection measurement to single particle in hand, then tells Bob of the measurement result. According to the results, Bob makes the appropriate operating of unitary transformation to two particle, plusing two auxiliary particles, conducting the appropriate operation of quantum gates. Through all of these operations Bob can rebuild four particle W state which is to be sent. The success probability of this project is 100%, and what’s more, it needs less particles and is easier to be accomplished.