关键词: 量子光学, 量子信息分离, von-Neumann测量, 四粒子w态, 量子信息

Abstract: A scheme of put forward a project using a five-particle entangled state as quantum channel, which can achieve the separate of quantum information of four particles w state. The sender Alice sends 2，5 particles to Bob and Send 3 particles to Charlie. The sender Alice conduct von-Neumann measurement to six particles in hand and tell Charlie and Bob measurement results. The controller Charlie make projection measurement to single particle in hand, then tell Bob of the measure result. According to the results ,Bob make the appropriate operating of unitary transformation to two particle, plusing two auxiliary particles, conducting the appropriate operation of quantum gates .Through all of this operations Bob can rebuild four particle w state which is to be sent . The success probability of this project is 100%,what’s more , it needs less particles and is easier to be accomplished.

Key words: quantum optics, separate of quantum information, measure of von-Neumann, four particle W state, quantum information