Open AccessA stable long-distance quantum key distribution system
Author(s) -
Guang Wu,
Zhou Chun-Yuan,
Xiuliang Chen,
Xiaodong Han,
Heping Zeng
Publication year - 2005
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.54.3622
Subject(s) - quantum key distribution , photon , physics , quantum network , quantum , computer science , optics , topology (electrical circuits) , quantum mechanics , quantum information , mathematics , combinatorics
A stable long-distance quantum key distribution system which has been just completed in our laboratory is demonstrated in this paper. The idea of “plug and pl ay" was adopted to automatically compensate the polarization mode dispersion and phase shift. A symmetrical capacitance-balance technique and magic-T network were used in the single-photon detection module, wherein a detection efficiency of more than 5% and a dark count probability of lower than 29×10-6/p ulse were achieved. As a result, we have realized stable (longer than 12 h) quantum k ey distribution experiment in 506 km single mode fiber with mean photon number of 007 and quantum bit error rate of 4%.