Multiparty quantum remote secret conference

作者：Li Xi Han; Li Chun Yan; Deng Fu Guo^*; Zhou Ping; Liang Yu Jie; Zhou Hong Yu

来源：Chinese Physics Letters, 2007, 24(1): 23-26.

We present two schemes for multiparty quantum remote secret conference in which each legitimate conferee can read out securely the secret message announced by another, but a vicious eavesdropper can get nothing about it. The first one is based on the same key shared efficiently and securely by all the parties with Greenberger-Horne-Zeilinger (GHZ) states, and each conferee sends his secret message to the others with one-time pad crypto-system. The other one is based on quantum encryption with a quantum key, a sequence of GHZ states shared among all the conferees and used repeatedly after confirming their security. Both these schemes are optimal as their intrinsic efficiency for qubits approaches the maximal value.

• 出版日期2007-1
• 单位北京市辐射中心; 北京师范大学