Open AccessReal-time low-frequency vibration phase drift tracking and auto-compensation in phase-coded quantum key distribution system
Author(s) -
Banghong Guo,
Lu Yi-qun,
Wang Fa-Qiang,
Feng Zhao,
Min Hu,
Lin Yi-Man,
Liao Chang-Jun,
Songhao Liu
Publication year - 2007
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.56.3695
Subject(s) - quantum key distribution , vibration , interferometry , compensation (psychology) , astronomical interferometer , physics , phase (matter) , frequency drift , tracking (education) , ultra low frequency , noise (video) , phase noise , optics , acoustics , computer science , phase locked loop , photon , quantum mechanics , psychology , pedagogy , artificial intelligence , image (mathematics) , psychoanalysis
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.