基于四粒子纠缠态的量子秘密共享方案

基于2个不同的四粒子纠缠态分别提出了三方、四方量子秘密共享方案，其中采用的秘密信息是一个相同的未知两粒子纠缠态。在量子秘密共享方案中发送者对所拥有的粒子实施适当的Bell态（或GHZ态）测量，发送者和合作者通过经典通讯把测量结果告知信息接收者,接收者在其他合作者的协助下通过实施相应的量子操作完成对初始量子态信息的重构。对所提出的2个方案进行了讨论和比较，发现四方量子秘密共享方案的安全性更加可靠。

Quantum secret sharing scheme based on four-particle entangled states

Three-party, four-party quantum secret sharing schemes are proposed based on two different four-particle entangled states, in which the secret information adopted is an identical unknown two-particle entangled state. In the quantum secret sharing scheme, the sender implements appropriate Bell or GHZ state measurement on the owned particles. The sender and partner inform the receiver measurement results by classical communications. The receiver can reconstruct the initial quantum state information by implementing the corresponding quantum operation with the assistance of other collaborators. The proposed two schemes are discussed and compared, and it’s found that the security of four-party quantum secret sharing scheme is more reliable.