量子经典网络融合中量子密钥分发（QKD）系统极弱信号的单光子特性对环境和网络的噪声非常敏感，而噪声是影响QKD系统成码率和量子误码率（QBER）的主要不利因素。本项目研究噪声对量子信号物理损伤机理，分析网络结构与接入网协议，优化关键器件，获得低 QBER 的QKD，解决与现有光网络接入技术难题。首次提出“五点法”和DD-OFDM信道与器件监测技术研究融合网络特异性、敏感性噪声指标；重点针对这一难题拟建立量子经典融合通信网络模型，研究多自由度联合调制 QKD系统，基于波分复用与PON 技术构建融合网络，探索QKD安全码率和可信授权等信息理论，研究获得密钥管理层不同定值的共享密钥分配和配置方案；进一步研究融合网络中稳定运行监测及开放的密钥传输参数库，提出监测与消弱噪声方案，优化QKD系统与融合网络，改善安全性和稳定性，对QKD 系统和网络集成、信息安全应用有重要理论价值和现实意义。

Quantum key distribution systems（QKDs）is very sensitive to the noise in the combined system between the quantum network and the classical network, due to the weak character of the single photon in the practical environment, while the noise is the fundamental function which is not conducive to the key generation rate and the quantum bit error rate (QBER). This project will study the damage mechanism of quantum noise on the quantum signal, analyze the network structure and the access protocol, optimize the key devices of the network to achieve lower QBER for QKD system and solve the access technical problems with the existing optical network. Also, this project will adopt the "five-point" and DD-OFDM channel monitoring technology to study the noise performance of the combined networks for the specificity and sensitivity for the first time. Moreover, the project will focus on establishing the communication model of the combined networks, studying the combined modulated QKD with multiple degrees of freedom, exploring QKD rate and trusted authorization information theory based on the WDM and PON technologies, getting shared key distribution and configuration with different values in the key management layer. Furthermore, the project will investigate the monitoring of the combined networks in the long-term stable operation and the open key transmission parameters library, propose the scheme to monitor and weaken the noise, optimize QKD system and the combined networks and improve the security and stability. The realization of this project would have great practical significance and profound strategic influence on integrating the QKD system and the current network communication as well as improving the information security.