Continuous-Variable Quantum Key Distribution with Multi-Mode Signals

连续可变量子密钥分发（CV-QKD）使用光的幅度和相位调制，以便在两个合法用户之间交换安全密钥。由于CV-QKD信号的强度极低，与信号相关的量子不确定性在信号测量中引入了噪声，同时在量子物理定律下提供了安全性。CV-QKD在许多方面类似于经典的相干通信，其中对测量数据的数字信号数据处理是最常见的。通过这项研究，我们的目标是在.NET环境下开发用于光纤和自由空间通信信道的多模CV-QKD系统的有效数据处理。本研究的主要目标是利用多模式的量子信号来开发具有高信噪比的CV-QKD系统。它还包括数据生成和采集设备的编程和接口，机载数据处理和协调。特别强调的是在图形处理单元中运行的纠错码。该研究还研究了与多模CV-QKD系统相关的漏洞。

Continuous Variable Quantum Key Distribution (CV-QKD) uses amplitude and phase modulation of light in order to exchange secure keys between two legitimate users. Since the intensity of the CV-QKD signal is extremely low, the quantum uncertainty associated with the signal introduces noise in the signal measurement while at the same time provides security under the laws of quantum physics. CV-QKD resembles to classical coherent communication in many of its aspects where digital signal data processing on the measurement data is a most common one.With this research, we are aiming to develop efficient data processing in .NET environment for multi-mode CV-QKD systems for fibre as well as for free-space communication channels. The primary goal of this research is to develop CV-QKD system that offers high signal to noise ratio by utilizing multiple modes of the quantum signals. It also includes programming and interfacing of data generation and acquisition devices, on board data manipulation and reconciliation. Particular emphasis is given on error correction codes running in graphics processing units. The research is also studying the vulnerabilities associated with multi-mode CV-QKD systems.