Authors: FangXing Xu Wei Chen Shuang Wang ZhenQiang Yin Yang Zhang Yun Liu Zheng Zhou YiBo Zhao HongWei Li Dong Liu ZhengFu Han GuangCan Guo
Publish Date: 2009/08/30
Volume: 54, Issue: 17, Pages: 2991-2997
Abstract
A hierarchical metropolitan quantum cryptography network upon the innercity commercial telecom fiber cables is reported in this paper The sevenuser network contains a fournode backbone net with one node acting as the subnet gateway a twouser subnet and a singlefiber access link which is realized by the FaradayMichelson interferometer setups 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 useroriented network with a high security levelSupported 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 and Innovation Funds of Chinese Academy of Sciences
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