基于六粒子簇态的量子信息分离方案

A quantum-information splitting scheme based on non-maximally six-qubit cluster state

利用非最大六粒子纠缠簇态作为量子信道,实现推广的任意二粒子量子态的信息分离方案。结果表明分离者可以让接收方中的任意一方在另一方的帮助下通过适当的幺正操作得到任意未知二粒子量子态。该方案中需要推广的Bell基测量(GBM)和单粒子测量(SM).并通过引入辅助粒子寻找合适纠缠匹配的方法实现概率量子信息分离。计算了量子信息分离(QIS)方案的成功概率和经典信息损耗,若量子信道为最大纠缠信道,方案成功的概率为1,同时将消耗14 bit的经典信息。

A generalized tripartite scheme is proposed for splitting an arbitrary two-qubit state by utilizing six-qubit non-maximally cluster states as quantum channel. It was shown that the splitter averagely partitions its unknown two-qubit state between two agents and either agent can recover the unknown state with the other agent＇s assistance via appropriate unitary operation. A generalized Bell state measurement （GBM） and a single-particle measurement （SM） are needed in the scheme. In order to obtain the original state, an auxiliary particle was introduced and a suitable entangled match was selected. The probability of the successful quantum-information splitting （QIS） and classical communication cost was worked out. If the quantum channel consists of maximally state, the classical information consumes 14 bits, and the total probability of QIS equals to 1.