利用N粒子纠缠态的量子秘密共享

 为了高效实现多方之间的量子秘密共享,引入了一种纠缠度较高的N粒子纠缠态,并提出了利用该N粒子纠缠态在一方与（N-1）方之间形成共享秘密位串的方案.该方案在建立秘密位串的过程中,Alice对发送的粒子随机选择么正操作I和σx,并选择一部分粒子用于检测信道的安全|之后Alice根据（N-1）方选择的操作又选择了一部分粒子用于对参与者诚实度检测及信道安全检测.通过多次对窃听者的检测,很好地保证了信道的安全性及产生的秘密位串的可用性.最终在Alice及另外（N-1）方之间可形成n1-(N-1)/2 N-1]/6个共享秘密位.

Quantum Secret Sharing with N-Particle Entangled State

In order to construct quantum secret sharing protocols among many parts,a N-particle entangled state that has a large persistency of entanglement is introduced,and a quantum secret sharing protocol between one party and （N-1） parties is presented using the proposed entangled state.During constructing secret sharing,Alice chooses randomly unitary operation I or σx for the sent particles,and chooses a part of the particles to check the safeness of channel|then Alice chooses another part of the particles to check the honesty of partners and the safeness of channel by the operations of (N-1) parties.The protocol carries on examination to the eavesdropper for many times,so that it can insure the safeness of channel and the usability of the secret strings.Finally,there are n1-(N-1)/2 N-1]/6 sharing secret bits among Alice and （N-1）parties.