Design And Implementation Of Control Protocols In Experimental Quantum Key Stribution Network

With the proposal of quantum computer, the safety of traditional secure communication becomes vulnerable. Quantum key distribution has been proposed to solve the problem. With the development of point-to-point QKD technology, using limited resource to serve more users, QKD technology is being developed towards network. The thesis concentrates on the study of control protocols related to quantum key distribution and the interference problem integrating QKD with classical optical network.In regard to the control protocols related to quantum key distribution in Windows, using Visual C++6.0integrated development environment, this paper implements the protocols in C++language, mainly including:1) positive phase sweeping and compensation to ensure the stability of system;2) generation of initial key by BB84protocol, and extraction of error free key from initial key by error detection and correction algorithm;3) data encryption using error free key by AES and transmission in the classical channel. In this way, we verify the secure communications function of the QKD system.In regard to the interference problem integrating QKD with classical optical network, the research group has proposed a simple and effective wavelength assignment scheme and the thesis has verified the effectiveness by MATLAB. In the end, the control module can flexibly control the switch node to ensure that any two of the users can distribute quantum key between each other.