Open AccessPhase compensation based on step-length control in continuous-variable quantum key distribution
Author(s) -
Dengwen Li,
Peng Huang,
Tao Wang,
Shiyu Wang,
Rui Chen,
Guihua Zeng
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.020670
Subject(s) - quantum key distribution , compensation (psychology) , computer science , bottleneck , phase (matter) , key (lock) , continuous variable , variable (mathematics) , control theory (sociology) , algorithm , feed forward , quantum , optics , control (management) , physics , mathematics , mathematical optimization , engineering , artificial intelligence , psychology , mathematical analysis , computer security , quantum mechanics , control engineering , psychoanalysis , embedded system
Phase compensation is a dispensable procedure to reduce the difference between legitimate parties in continuous-variable quantum key distribution (CVQKD) because of the unavoidable phase drift of the quantum signals. However, it is a difficult task to compensate the fast drifted phase accurately. Here, we propose a novel phase compensation scheme based on an optimal iteration algorithm. Analysis shows that this scheme can make the phase compensation reach a higher precision level while simultaneously ensuring the efficiency. When the accuracy is determined, we can minimize the number of iterations by controlling the step-length to increase the algorithm efficiency. Moreover, we can improve the accuracy of phase compensation by means of changing the step-length. This work breaks the bottleneck of accuracy problem in phase compensation and contributes to the performance of the whole CVQKD system.