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Chinese Science Bulletin

, Volume 54, Issue 17, pp 2991–2997 | Cite as

Field experiment on a robust hierarchical metropolitan quantum cryptography network

  • FangXing Xu
  • Wei ChenEmail author
  • Shuang Wang
  • ZhenQiang Yin
  • Yang Zhang
  • Yun Liu
  • Zheng Zhou
  • YiBo Zhao
  • HongWei Li
  • Dong Liu
  • ZhengFu HanEmail author
  • GuangCan Guo
Articles/Quantum Information

Abstract

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.

Keywords

quantum cryptography quantum key distribution quantum cryptography network 

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Supplementary material

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Copyright information

© Science in China Press and Springer-Verlag GmbH 2009

Authors and Affiliations

  • FangXing Xu
    • 1
  • Wei Chen
    • 1
    Email author
  • Shuang Wang
    • 1
  • ZhenQiang Yin
    • 1
  • Yang Zhang
    • 1
  • Yun Liu
    • 1
  • Zheng Zhou
    • 1
  • YiBo Zhao
    • 1
  • HongWei Li
    • 1
    • 2
  • Dong Liu
    • 1
  • ZhengFu Han
    • 1
    Email author
  • GuangCan Guo
    • 1
  1. 1.Key Laboratory of Quantum Information (CAS)University of Science and Technology of ChinaHefeiChina
  2. 2.Electronic Technology InstituteInformation Engineering UniversityZhengzhouChina

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