Open AccessPractical continuous-variable quantum key distribution without finite sampling bandwidth effects
Author(s) -
Huasheng Li,
Chao Wang,
Peng Huang,
Duan Huang,
Tao Wang,
Guihua Zeng
Publication year - 2016
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.24.020481
Subject(s) - quantum key distribution , computer science , bandwidth (computing) , sampling (signal processing) , electronic engineering , algorithm , data acquisition , key (lock) , control theory (sociology) , real time computing , optics , physics , telecommunications , control (management) , detector , engineering , computer security , artificial intelligence , operating system , photon
In a practical continuous-variable quantum key distribution system, finite sampling bandwidth of the employed analog-to-digital converter at the receiver's side may lead to inaccurate results of pulse peak sampling. Then, errors in the parameters estimation resulted. Subsequently, the system performance decreases and security loopholes are exposed to eavesdroppers. In this paper, we propose a novel data acquisition scheme which consists of two parts, i.e., a dynamic delay adjusting module and a statistical power feedback-control algorithm. The proposed scheme may improve dramatically the data acquisition precision of pulse peak sampling and remove the finite sampling bandwidth effects. Moreover, the optimal peak sampling position of a pulse signal can be dynamically calibrated through monitoring the change of the statistical power of the sampled data in the proposed scheme. This helps to resist against some practical attacks, such as the well-known local oscillator calibration attack.