Parameter Optimization Of QKD Protocols And Design Of Quantum Key Application Strategies For Power Dispatching

Power dispatching data network(PDDN),which is an important part of large-scale interconnected power grids,carries a large amount of important dispatching and monitoring information,so the security of its information transmission must be highly concerned and strictly guaranteed.Quantum key distribution(QKD)technology is based on physical principles such as quantum uncertainty principle,unclonable unknown quantum states,and measuring collapse principle.It can provide quantum keys with unconditional secure for PDDN to ensure the long-term security of its information transmission.However,the key rate of the current QKD protocol is generally low,and it is difficult to adapt to the complex power system application environment.Therefore,it is.of great theoretical significance and practical value to optimize the parameters of QKD protocol to improve its keying performance and design the quantum key application strategy for power dispatching.In this paper,the improved local search algorithm(LSA)is used-to optimize the parameters of several typical QKD protocols,and a reasonable quantum key application strategy is proposed for power application scenarios.The specific work and achievements of this paper are as follows.First,aiming at the imperfection of the source and measurement device of the QKD system,the BB84 protocol and the measurement-device-independent(MDI)protocol(symmetry and asymmetric)model based on decoy-state(DS)is established,the improved LSA is used to optimize all parameters including pulse intensity and base selection probability,which improved the security key rate and transmission distance of the two protocols,and the performance of the two protocols is compared.Then,aiming at the non-ideal QKD channel,the protocol model of reference-frame-independent(RFI)BB84 and MDI protocol based on DS are established,the performance of the two protocols is optimized with LSA,and the effects of different reference frame offset angles on its security keying rate are compared.The results show that RFI protocol is robust to strong interference,so that the power QKD application system does not need too much time to adjust the reference system.Finally,aiming at the hierarchical PDDN of centralized control architecture in China,the DS-BB84 and DS-MDI quantum key integrating application strategy for power dispatching is designed,and the performance of the conventional QKD network without RFI and the QKD network with RFI on some links were tested for dynamic performance of quantum key applications under normal and abnormal operating conditions,respectively.The test results show that the quantum key integrating application strategy proposed in this paper maximizes the actual security of power dispatch data transmission while fully considering the differences in information security requirements of different services.The results of this paper can provide effective theoretical guidance for the construction of QKD platform in PDDN.