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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 26 — Dec. 20, 2010
  • pp: 27217–27225

Metropolitan all-pass and inter-city quantum communication network

Teng-Yun Chen, Jian Wang, Hao Liang, Wei-Yue Liu, Yang Liu, Xiao Jiang, Yuan Wang, Xu Wan, Wen-Qi Cai, Lei Ju, Luo-Kan Chen, Liu-Jun Wang, Yuan Gao, Kai Chen, Cheng-Zhi Peng, Zeng-Bing Chen, and Jian-Wei Pan  »View Author Affiliations

Optics Express, Vol. 18, Issue 26, pp. 27217-27225 (2010)

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We have demonstrated a metropolitan all-pass quantum communication network in field fiber for four nodes. Any two nodes of them can be connected in the network to perform quantum key distribution (QKD). An optical switching module is presented that enables arbitrary 2-connectivity among output ports. Integrated QKD terminals are worked out, which can operate either as a transmitter, a receiver, or even both at the same time. Furthermore, an additional link in another city of 60 km fiber (up to 130 km) is seamless integrated into this network based on a trusted relay architecture. On all the links, we have implemented protocol of decoy state scheme. All of necessary electrical hardware, synchronization, feedback control, network software, execution of QKD protocols are made by tailored designing, which allow a completely automatical and stable running. Our system has been put into operation in Hefei in August 2009, and publicly demonstrated during an evaluation conference on quantum network organized by the Chinese Academy of Sciences on August 29, 2009. Real-time voice telephone with one-time pad encoding between any two of the five nodes (four all-pass nodes plus one additional node through relay) is successfully established in the network within 60km.

© 2010 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.5565) Fiber optics and optical communications : Quantum communications
(270.5565) Quantum optics : Quantum communications

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: August 9, 2010
Revised Manuscript: November 8, 2010
Manuscript Accepted: December 6, 2010
Published: December 10, 2010

Teng-Yun Chen, Jian Wang, Hao Liang, Wei-Yue Liu, Yang Liu, Xiao Jiang, Yuan Wang, Xu Wan, Wei-Qi Cai, Lei Ju, Luo-Kan Chen, Liu-Jun Wang, Yuan Gao, Kai Chen, Cheng-Zhi Peng, Zeng-Bing Chen, and Jian-Wei Pan, "Metropolitan all-pass and inter-city quantum communication network," Opt. Express 18, 27217-27225 (2010)

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