Open AccessAn effective active phase compensation method for quantum key distribution system
Author(s) -
Jindong Wang,
Qin Xiao-Juan,
Zhengjun Wei,
Xiaobao Liu,
Liao Chang-Jun,
Songhao Liu
Publication year - 2010
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.59.281
Subject(s) - quantum key distribution , computer science , compensation (psychology) , key (lock) , phase (matter) , faraday cage , quantum , electronic engineering , physics , quantum mechanics , psychology , computer security , psychoanalysis , magnetic field , engineering
Quantum key distribution (QKD) system must be robust enough in practical communication. The system performance is notably affected by phase drift. For the fiber-based phase-encoded quantum key distribution system, the Faraday-Michelson QKD scheme can auto-compensate the birefringence of fiber, but phase drift caused by environment variations is still a serious problem in practical operation. In this paper, the major schemes to compensate for the phase drift are analyzed in detail and an “five-phase”effective active phase compensation method is proposed. The comparison with other two major active phase compensation schemes also given. The result shows that this method uses less time to acquire the parameter of phase drift with the same precision and it can be used in phase-encoded QKD systems without introducing additional devices.