%0 Journal Article
%T Real-time low-frequency vibration phase drift tracking and auto-compensation in phase-coded quantum key distribution system<br>相位调制量子密钥分配系统中低频振动相移的实时跟踪补偿
%A Guo Bang-Hong
%A Lu Yi-Qun
%A Wang Fa-Qiang
%A Zhao Feng
%A Hu Ming
%A Lin Yi-Man
%A Liao Chang-Jun
%A Liu Song-Hao
%A <br>郭邦红
%A 路轶群
%A 王发强
%A 赵峰
%A 胡敏
%A 林一满
%A 廖常俊
%A 刘颂豪
%J 物理学报
%D 2007
%I 
%X Phase drift caused by environment is the main source of quantum bit error rate and instability in the double M-Z interferometer quantum key distribution(QKD) system. The phase drift consists of both high-frequency and low-frequency vibrations, the former, which is due to environment noise, is usually conducted via the atmosphere and can be isolated by technological measures (e.g. using foamed-plastics wrapping or rubber pillow ), the latter comes from building-vibration, which vibrates slowly with a serious impact on M-Z interferometer, with a period of 3±0.32 min (min level). A novel real-time tracking and compensation method for phase drift caused by low-frequency vibration is proposed. With the improved scheme, the QKD system based on double M-Z interferometers can operate stably for 24 hours, and key exchange with an error below 6% over 75 kilometers has been achieved in the lab.
%K quantum cryptography
%K quantum key distribution
%K low-frequency concuss
%K real-time phase compensation<br>量子保密通信
%K 量子密钥分配
%K 低频振动
%K 实时相位补偿
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=1DD5037210479480&yid=A732AF04DDA03BB3&vid=014B591DF029732F&iid=DF92D298D3FF1E6E&sid=EC8A602D0661ED8F&eid=74A9E3EBD9AE2843&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=19