Research And Design Of The Control System Of High Speed Cvqkd

The CVQKD is not only unconditional secure but also able to detect the eavesdropper. The facility applied in such system is also simple, low difficulty and high channel capacity. All of these mean much significance to us doing the theory research and launching the experiment. In order to improve the secure key distribution rate obviously, there are still some difficulty in designing the system which is characteristic of good performance, high stability and strong commonality. The article aims at the following content to solve such problem.1. Analysis the CVQKD system based on PCI 6115 DAQ Card. Summarize the system construction, work process and the key function modules to understand the advantage and the insufficient of the system. Finally we proposed to design a high speed DAQ Card.2. Design the high speed DAQ Card to control the CVQKD system. According to the demands of CVQKD, the implemented high speed DAQ Card integrates with high speed AD Card, high speed DA Card, DDR2 with 1GB memory capacity, and supports communication with the host machine through PCI Express interface. The article also shows us the transmission performance between the DAQ Card and the host, as well as with the loop function test result.3. Propose a scheme for high speed CVQKD system based on the DAQ Card. In accordance with the qualification of the DAQ Card, we design the workflow and the key logic module for the system. At the last, we calculate the secure key distribution rate in theory, and illustrate the feasibility of this system.