标题：Novel multiparty quantum key agreement protocol with GHZ states
作者：Xu, Guang-Bao; Wen, Qiao-Yan; Gao, Fei; Qin, Su-Juan
作者机构：[Xu, Guang-Bao; Wen, Qiao-Yan; Gao, Fei; Qin, Su-Juan] Beijing Univ Posts & Telecommun, State Key Lab Networking & Switching Technol, Beijing 100876, 更多
通讯作者地址：[Xu, GB]Beijing Univ Posts & Telecommun, State Key Lab Networking & Switching Technol, Beijing 100876, Peoples R China.
来源：QUANTUM INFORMATION PROCESSING
关键词：Quantum key agreement; GHZ state; Single-particle measurement
摘要：In many circumstances, a shared key is needed to realize secure communication. Based on quantum mechanics principles, quantum key agreement (QKA) is a good method to establish a shared key by every party's fair participation. In this paper, we propose a novel three-party QKA protocol, which is designed by using Greenberger-Horne-Zeilinger (GHZ) states. To realize the protocol, the distributor of the GHZ states needs only one quantum communication with the other two parties, respectively, and everyone performs single-particle measurements simply. Then, we extend the three-party QKA protocol to arbitrary multiparty situation. At last, we discuss the security and fairness of the multiparty protocol. It shows that the new scheme is secure and fair to every participant.