Performance Evaluation and Optimization Method in QKD Network for Digital Power Grid

In the actual operating environment, the data traffic of each quantum VPN tunnel is different, which will affect the amount of key consumed by each service data encryption. In this work, the key generation rate, bandwidth bottleneck and delay generation mechanism of the transmission link of the multi-relay network node of service packets is analysed. We propose an end-to-end available key rate measurement method by analyzing the end-to-end delay for trusted-relay QKD network. Such performance evaluation method can help us optimize the route in a real-time manner to ensure the fast encryption, decide whether allow newly added services based on the encryption capability of QKD network and monitor the posture of QKD network. The effectiveness of our method is verified by simulation with NS2.