在全球广域量子保密通信网络宏伟愿景的驱动下，全天候空间量子保密通信成为量子信息领域的研究热点。基于量子密钥分发（Quantum Key Distribution，QKD）技术的机载量子保密通信是构建空天地一体化量子保密通信网络的最后一块拼图，为破解复杂电磁环境下射频航空通信安全隐患提供了新的解决方案。本项目针对中低空环境下机载平台全天候作战任务、环境、运动等特点，开展机载QKD应用中背景光噪声抑制、量子态退化机理及补偿、精确时间同步等关键技术研究，探索全天候机载QKD实现途径。运用高维量子态编码滤波方法破解背景光噪声问题；通过刻画大气信道致量子偏振态退化模型，采用波前校准补偿技术解决量子态劣化问题；基于极窄激光脉冲和光“稀疏同步”方法提高时间同步精度。本项目研究旨在助推机载QKD全天候应用进程，显著提升军事航空平台遂行复杂电磁环境下的信息作战能力。

Driven by the grand prospect of global secure quantum communication network, quantum communication in all-weather has become the hot issue of quantum information. Based on quantum key distribution (QKD), the airborne quantum communication performs as the last piece of puzzle for the integrated quantum communication network. It provides a new solution for the potential risks of radio frequency aviation communication in the complex electromagnetic environment. Aiming at the characteristics of all-weather combat tasks, flight environment and maneuvering behavior, this project explores some key technologies such as the methods of suppressing background noise, mechanisms of quantum state degradation and high resolution synchronization schemes. In order to explore the approach of realizing all-weather airborne QKD, the influence of background noise is overcome by using high-dimensional quantum coding. The problem of quantum state degradation is investigated by degradation modeling and using wave-front calibration. The accuracy of synchronization is enhanced through optical sparse synchronization method based on narrow-band laser pulse. Our research will be beneficial to accelerate the all-weather application of airborne QKD. It will also improve the operation capability of military aircrafts in complex electromagnetic environment.