Field experiment on a robust hierarchical metropolitan quantum cryptography network  

作　　者：XU FangXing CHEN Wei WANG Shuang YIN ZhenQiang ZHANG Yang LIU Yun ZHOU Zheng ZHAO YiBo LI HongWei LIU Dong HAN ZhengFu GUO GuangCan 

机构地区：[1]Key Laboratory of Quantum Information (CAS), University of Science and Technology of China, Hefei 230026, China [2]Electronic Technology Institute, Information Engineering University, Zhengzhou 450004, China

出　　处：《Chinese Science Bulletin》2009年第17期2991-2997,共7页

基　　金：Supported by the Wuhu Government and China Telecommunications Corporation, Wuhu Branch, and National Basic Research Program of China (Grant No. 2006CB921900);National Natural Science Foundation of China (Grant Nos. 60537020, 60621064);Innovation Funds of Chinese Academy of Sciences

摘　　要：A hierarchical metropolitan quantum cryptography network upon the inner-city commercial telecom fiber cables is reported in this paper. The seven-user network contains a four-node backbone net with one node acting as the subnet gateway, a two-user subnet and a single-fiber access link, which is realized by the Faraday-Michelson interferometer set-ups. The techniques of the quantum router, optical switch and trusted relay are assembled here to guarantee the feasibility and expandability of the quantum cryptography network. Five nodes of the network are located in the government departments and the secure keys generated by the quantum key distribution network are utilized to encrypt the instant video, sound, text messages and confidential files transmitting between these bureaus. The whole implementation including the hierarchical quantum cryptographic communication network links and the corresponding application software shows a big step toward the practical user-oriented network with a high security level.A hierarchical metropolitan quantum cryptography network upon the inner-city commercial telecom fiber cables is reported in this paper. The seven-user network contains a four-node backbone net with one node acting as the subnet gateway, a two-user subnet and a single-fiber access link, which is realized by the Faraday-Michelson interferometer set-ups. The techniques of the quantum router, optical switch and trusted relay are assembled here to guarantee the feasibility and expandability of the quantum cryptography network. Five nodes of the network are located in the government departments and the secure keys generated by the quantum key distribution network are utilized to encrypt the instant video, sound, text messages and confidential files transmitting between these bureaus. The whole implementation including the hierarchical quantum cryptographic communication network links and the corresponding application software shows a big step toward the practical user-oriented network with a high security level.

关 键 词：量子密码通信网络 网络加密 田间试验 迈克尔逊干涉仪 用户网络 光开关技术 光纤电缆 商业通信 

分 类 号：TP393.08[自动化与计算机技术—计算机应用技术] TN918[自动化与计算机技术—计算机科学与技术]