Most of the existing metropolitan quantum networks are implemented based on a single quantum key distribution protocol,and interconnecting metropolitan quantum networks implemented by different protocols are the development trend of large-scale quantum networks,but there are still some problems in the provision of inter-domain key services,such as low possibility of success and mismatch between key supply and demand.To solve the above problems,this paper proposes two on-demand inter-domain key service provisioning strategies for multi-domain cross-protocol quantum networks,namely,on-demand provisioning strategy based on BB84 bypass first(BB84-BF)and on-demand provisioning strategy based on MDI bypass first(MDI-BF).Meanwhile,a service provisioning model for multi-domain cross-protocol quantum networks is constructed,and an on-demand inter-domain key service provisioning algorithm is designed.Moreover,numerical simulations and performance evaluation are carried out under two scenarios:high key rate demand and low key rate demand for two-domain and three-domain quantum network topologies.Simulation results verify that the proposed on-demand provisioning strategies have better applicability to different multi-domain quantum networks.In addition,for different key rate requirements,the MDI-BF strategy and BB84-BF strategys have different performance advantages under different performance indicators.For example,in terms of the success possibility of inter-domain key service requests,the MDI-BF strategy is more suitable for the low key rate requirements(～30％higher than the traditional strategies in two domain topologies),while the BB84-BF strategy is more suitable for the high key rate requirements(～19％higher than the traditional strategies under two domain topologies).In addition,compared with the traditional strategies,the proposed on-demand provisioning strategies can increase the balance degree between key supply and demand by more than one order of magnitude.Hence,the proposed strategies can reduce the cost of inter-domain key service provisioning and improve the realistic security level.
关键词
多域量子网络/量子密钥分发/跨协议/密钥业务提供
Key words
multi-domain quantum networks/quantum key distribution/cross-protocol/key service provisioning
维普
万方数据