基于六量子比特纠缠混态的三方量子态分享

Three-party quantum state sharing with six-qubit entangled mixing state

量子网络中有三个节点,每个节点有一对全同量子比特,这六个量子比特最初处于一种量子纠缠纯态[Chen et al.Phys Rev A,2006,74:032324].本文考虑三个节点中的量子比特都发生了混淆,利用混淆后的量子态作为量子通道,提出了一个三方量子态分享协议.文中分析讨论了该协议的安全性、成功概率、分享者对称性和它们的深层物理以及协议的实验可行性.研究发现,该协议是安全的;任一分享者都可以1/2概率获取被分享量子态;根据当前实验技术协议切实可行.

The quantum network has three nodes,each with two identical qubits.The six-qubit system is in a genuine state proposed by Chen et al.[Phys Rev A,2006,74:032324].In this paper we consider the case where two qubits in each node are confused and propose a three-party quantum state sharing scheme using the six-qubit mixing state as the quantum channel.We investigated scheme security,success probability,sharer symmetry,as well as the underlying physics,and scheme feasibility.The scheme is observed to be secure,including that any state can be safely shared successfully by the three legitimate parties with a 1/2 probability;moreover,the scheme is feasible in terms of the current technologies.