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Proceedings Paper

Decoy state quantum key distribution in telecom dark fiber
Author(s): Wei Chen; Zheng-fu Han; Zhen-qiang Yin; Qing-lin Wu; Guo Wei; Guang-can Guo
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Paper Abstract

The imperfect components of a quantum key distribution (QKD) system will degrade its security. The highly attenuated weak coherent laser source used in today's QKD system is vulnerable to PNS attacks due to multi-photon optical pulses. Decoy State QKD, which is capable of beating PNS attacks and providing unconditional security, has been an attractive scheme recently. We have used a one way Faraday-Michelson phase modulated QKD system to implement 123km decoy state QKD in the lab. Furthermore a field decoy state QKD experiment of 32km dark fiber in Beijing is fulfilled. The optical pulse repetition rate is 1MHz and the final secure key is 9.59×10-7 (6.784×10-6) bit per pulse for 123km (32km). The experiment result indicates that the decoy state scheme can be successfully used in real-life metropolitan QKD sessions.

Paper Details

Date Published: 26 November 2007
PDF: 6 pages
Proc. SPIE 6827, Quantum Optics, Optical Data Storage, and Advanced Microlithography, 682709 (26 November 2007); doi: 10.1117/12.756067
Show Author Affiliations
Wei Chen, Univ. of Science and Technology of China (China)
Zheng-fu Han, Univ. of Science and Technology of China (China)
Zhen-qiang Yin, Univ. of Science and Technology of China (China)
Qing-lin Wu, Univ. of Science and Technology of China (China)
Guo Wei, Univ. of Science and Technology of China (China)
Guang-can Guo, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 6827:
Quantum Optics, Optical Data Storage, and Advanced Microlithography
Chris A. Mack; Jinfeng Kang; Jun-en Yao; Guangcan Guo; Song-hao Liu; Osamu Hirota; Guofan Jin; Kees A. Schouhamer Immink; Keiji Shono, Editor(s)

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