Quantum Satellite Wide Area Network Construction and Performance Simulation Based on Quantum Repeater

∗In order to improve the communication performance during longdistance transmission of quantum states, this paper establishes a quantum relay model between the sender and the receiver to achieve long-distance communication. Specifically, we propose a quantum state entanglement purification process based on fishing strategy by analyzing the model of quantum repeater and then build a wide area network architecture on this basis. Finally, numerical simulation results represent that the bit error rate of quantum information transmission decreases with the fidelity of entanglement purification increases and the throughput rate increases with the probability of successful entanglement purification increases. Therefore, the use of quantum repeater can effectively improve the transmission performance of quantum states as well as provide a theoretical basis for future practical secure quantum wide area network communication.