The linear constraint of secret key rate capacity is overcome by the tiwn-field quantum key distribution (QKD). However, the complex phase-locking and phase-tracking technique requirements throttle the real-life applications of twin-field protocol. The asynchronous measurement-device-independent (AMDI) QKD or called mode-pairing QKD protocol can relax the technical requirements and keep the similar performance of twin-field protocol. Here, we propose an AMDI-QKD protocol with a nonclassical light source by changing the phase-randomized weak coherent state to a phase-randomized coherent-state superposition in the signal state time window. Simulation results show that our proposed hybrid source protocol significantly enhances the key rate of the AMDI-QKD protocol, while exhibiting robustness to imperfect modulation of nonclassical light sources.
@article{arxiv.2304.04569,
title = {Asynchronous measurement-device-independent quantum key distribution with hybrid source},
author = {Jun-Lin Bai and Yuan-Mei Xie and Yao Fu and Hua-Lei Yin and Zeng-Bing Chen},
journal= {arXiv preprint arXiv:2304.04569},
year = {2023}
}