Quantum key distribution in 50-km optic fibers  

作　　者：ZHOU Chunyuan WU Guang CHEN Xiuliang LI Hexiang ZENG Heping 

机构地区：[1]Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China Key Laboratory of Optical and Magnetic Resonance Spectroscopy, and Department of Physics, East China Normal University, Shanghai 200062, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2004年第2期182-188,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Shanghai Priority Academic Discipline,the National Natural Science Foundation of China(Grant No.10374028);the National Fundamental Research Program of China(Grant No.001CB309301).

摘　　要：In this paper, we report our recent experiment of long-distance fiber-optic plug and play quantum cryptography system wherein a Faraday-Mirror was used to compensate for the polarization mode dispersion and phase drifts. The pulse-biased coincident gate single-photon detection technique was used to effectively reduce the noises from the detrimental Rayleigh backscattering. We have achieved a quantum key distribution system with the working distance of 50 km, which was tested to be stable in more than 6 hours continuous work. And we also demonstrated the practical quantum communication in a local area network using the TCP protocol.In this paper, we report our recent experiment of long-distance fiber-optic “plug and play” quantum cryptography system wherein a Faraday-Mirror was used to compensate for the polarization mode dispersion and phase drifts. The pulse-biased conincident gate single-photon detection technique was used to effectively reduce the noises from the detrimental Rayleigh backscattering. We have achieved a quantum key distribution system with the working distance of 50 km, which was tested to be stable in more than 6 hours' continuous work. And we also demonstrated the practical quantum communication in a local area network using the TCP protocol.

关 键 词：quantum cryptography  SINGLE-PHOTON interference  polarization mode dispersion  phase- modula. 

分 类 号：O4[理学—物理]