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Experimental Study on Practical Quantum Key Distribution Scheme with Time-Multiplexed Technique |
| HUANG Yu-Xian1, HU Hua-Peng1, LIANG Rui-Sheng*, LU Yi-Qun1, WANG Jin-Dong1 |
| 1Lab of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 5100062Hefei Institute of Intelligent Machine, Chinese Academy of Sciences, Hefei 230031 |
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| Cite this article: |
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HUANG Yu-Xian, HU Hua-Peng, LIANG Rui-Sheng et al 2008 Chin. Phys. Lett. 25 2485-2487 |
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Abstract We present a scheme that is capable of detecting photon numbers during the quantum key distribution (QKD) based on an improved differential phase shift (DPS) system without Trojan horse attack. A time-multiplexed detector (TMD) is set in for the photon-number resolution. Two fibre loops are used for detecting photon numbers as well as distributing keys. The long-term stabilization is guaranteed by two Faraday mirrors (FM) at Bob's site to automatically compensate for polarization defect. Our experimental study (90km QKD is completed) indicates that such a system is stable and secure which nearly reaches the performance of a single photon scheme.
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| Keywords:
42.50.-p
42.50.Ar
42.50.Dv
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Received: 21 November 2007
Published: 26 June 2008
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