Satellite-relayed intercontinental quantum network

Abstract

In recent years, with the development of long-distance communication, the encryption method has become one of the crucial topics. Quantum communication, with the advantage of no-cloning theorem, is far more secure than traditional communication and could be a key method in encrypted communication. In this paper, we simulate the whole process of quantum encryption, we simulate the satellite-relayed quantum key distribution, the transmission of encrypted information, and the decoding of the received message, meanwhile using Hamming code error correction method to reduce the noise. During the simulation, we successfully realize the transmission of an encrypted picture and efficiently reduce the noise associated with it. In conclusion, our thesis shows that quantum communication could be an ideal method to realize encrypted communication. However, our thesis is only based on the simulation of the satellite-relayed quantum network and the channel noise still destroys some part of the decoded picture, thus more practical testing should be done to confirm this theory and some advanced methods should be used to reduce the channel noise.