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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 8 — Apr. 12, 2010
  • pp: 8587–8594

Decoy-state quantum key distribution with polarized photons over 200 km

Yang Liu, Teng-Yun Chen, Jian Wang, Wen-Qi Cai, Xu Wan, Luo-Kan Chen, Jin-Hong Wang, Shu-Bin Liu, Hao Liang, Lin Yang, Cheng-Zhi Peng, Kai Chen, Zeng-Bing Chen, and Jian-Wei Pan  »View Author Affiliations


Optics Express, Vol. 18, Issue 8, pp. 8587-8594 (2010)
http://dx.doi.org/10.1364/OE.18.008587


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Abstract

We report an implementation of decoy-state quantum key distribution (QKD) over 200 km optical fiber cable through photon polarization encoding. This is achieved by constructing the whole QKD system operating at 320 MHz repetition rate, and developing high-speed transmitter and receiver modules. A novel and economic way of synchronization method is designed and incorporated into the system, which allows to work at a low frequency of 40kHz and removes the use of highly precise clock. A final key rate of 15 Hz is distributed within the experimental time of 3089 seconds, by using super-conducting single photon detectors. This is longest decoy-state QKD yet demonstrated up to date. It helps to make a significant step towards practical secure communication in long-distance scope.

© 2010 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(270.0270) Quantum optics : Quantum optics
(060.5565) Fiber optics and optical communications : Quantum communications

ToC Category:
Quantum Optics

History
Original Manuscript: January 6, 2010
Revised Manuscript: March 22, 2010
Manuscript Accepted: March 29, 2010
Published: April 8, 2010

Citation
Yang Liu, Teng-Yun Chen, Jian Wang, Wen-Qi Cai, Xu Wan, Luo-Kan Chen, Jin-Hong Wang, Shu-Bin Liu, Hao Liang, Lin Yang, Cheng-Zhi Peng, Kai Chen, Zeng-Bing Chen, and Jian-Wei Pan, "Decoy-state quantum key distribution with polarized photons over 200 km," Opt. Express 18, 8587-8594 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-8-8587


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