设备弱无关型“4+2”量子保密通信系统及其关键性能优化调控理论研究

现有技术条件下，量子保密通信(QKD)系统中信源特性存在不可控缺陷，是重要的安全漏洞。测量设备无关类型的QKD(MDIQKD)系统是目前的研究热点，因而，信源的相位、强度、维度等主要特性的不可控缺陷对MDIQKD系统关键性能的影响是亟待解决的关键科学问题， 但相关研究少见报道。本项目开展设备弱无关型 "4+2"QKD (WDI "4+2"QKD)系统及其关键性能优化调控理论研究，具体如下:（1）提出WDI"4+2"QKD系统的几种有效通信模式：侧信源自监测模式、双信源自监测模式等;（2）建立WDI"4+2"QKD系统的安全性分析理论模型与关键性能分析方程;（3）优化光量子信源制备、探测及后处理模式，提出WDI "4+2"QKD系统关键性能优化调控的理论方法。这对解决MDIQKD系统信源安全问题，促进对设备可信度弱依赖的高性能QKD系统实验有十分重要的理论意义与潜在的应用价值。

With current technology，there are some uncontrollable factors in the sources of quantum key distribution(QKD)systems, which is in fact an important security loophole. Measurement device independent QKD(MDIQKD) is the hot research at present, this follows that the effects on the key performances of MDIQKD for the main uncontrollabe factors of sources such as phase, intensity and dimension is a key science problem that needs to be investigated, but few studies have been reported at present. This project focus on investigating weak device-independent “4+2” QKD (WDI “4+2” QKD) system (a new system) and its key-performances optimization control, details are as following: first, we will propose several communication modes such as the side sources self-monitoring mode, twin sources self-monitoring mode for the WDI “4+2”QKD system，and the corresponding security analysis model of the WDI“4+2”DKD system will be given, and further more, the formula between the key performances and key-parameters of these modes will also be derived out; third，by optimizing the preparation model, detection model and post-processing model of photon sources, we will explore the key-performances optimization method protocols for the WDI“4+2”QKD system. This project have great meanings in solving the theory problem of sources security in MDIQKD, and is important for promoting the experiment of high performances QKD which is weakly dependent on the trustablity of devices.