Open AccessImproved analysis of measurement-device-independent quantum key distribution with non-phase-randomized coherent states
Author(s) -
Yan Zhu,
Chun-Mei Zhang
Publication year - 2021
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.435687
Subject(s) - quantum key distribution , coherent states , key (lock) , optics , phase modulation , transmission (telecommunications) , modulation (music) , computer science , detector , quantum channel , physics , quantum cryptography , phase (matter) , quantum , quantum mechanics , quantum information , phase noise , telecommunications , photon , computer security , acoustics
Measurement-device-independent quantum key distribution (MDI-QKD) can remove all detector side-channel attacks, which can be implemented with phase-randomized coherent states (PRCS) or non-phase-randomized coherent states (NPRCS). In this paper, we focus on the MDI-QKD protocol with NPRCS and provide an improved analysis. In contrast with the original MDI-QKD with NPRCS which modulates the same intensity of coherent states in the key and test bases, we propose to modulate different intensities of coherent states in the key and test bases. Simulation results show that the secret key rate and transmission distance of MDI-QKD with NPRCS can be significantly improved. Furthermore, it is noteworthy that the modulation of different intensities does not bring extra complexity for experimental researchers, which can be easily done by adding an intensity modulator.