Untrusted node networks initially implemented by measurement-device-independent quantum key distribution(MDI-QKD)protocol are a crucial step on the roadmap of the quantum Internet.Considering extensive QKD implementat...Untrusted node networks initially implemented by measurement-device-independent quantum key distribution(MDI-QKD)protocol are a crucial step on the roadmap of the quantum Internet.Considering extensive QKD implementations of trusted node networks,a workable upgrading tactic of existing networks toward MDI networks needs to be explicit.Here,referring to the nonstandalone(NSA)network of 5G,we propose an NSA-MDI scheme as an evolutionary selection for existing phase-encoding BB84 networks.Our solution can upgrade the BB84 networks and terminals that employ various phase-encoding schemes to immediately support MDI without hardware changes.This cost-effective upgrade effectively promotes the deployment of MDI networks as a step of untrusted node networks while taking full advantage of existing networks.In addition,the diversified demands on security and bandwidth are satisfied,and network survivability is improved.展开更多
The main obstacle of realizing long-distance quantum key distribution(QKD)[1]is that the secret key rate(SKR)decreases with the loss of the quantum channel.Specifically,the transmittanceηof a quantum channel depends ...The main obstacle of realizing long-distance quantum key distribution(QKD)[1]is that the secret key rate(SKR)decreases with the loss of the quantum channel.Specifically,the transmittanceηof a quantum channel depends on its distance,namelyη=10^(−αl/10),whereα=0.2dB/km for a typical fiber channel,and l is the distance of the channel.For most single-photon-based QKD protocols,including the well-known BB84[1].展开更多
基金National Key Research and Development Program of China(2018YFA0306400)National Natural Science Foundation of China(61475148,61575183,61622506,61627820,61675189)+1 种基金China Postdoctoral Science Foundation(2021M693098)Anhui Initiative in Quantum Information Technologies.
文摘Untrusted node networks initially implemented by measurement-device-independent quantum key distribution(MDI-QKD)protocol are a crucial step on the roadmap of the quantum Internet.Considering extensive QKD implementations of trusted node networks,a workable upgrading tactic of existing networks toward MDI networks needs to be explicit.Here,referring to the nonstandalone(NSA)network of 5G,we propose an NSA-MDI scheme as an evolutionary selection for existing phase-encoding BB84 networks.Our solution can upgrade the BB84 networks and terminals that employ various phase-encoding schemes to immediately support MDI without hardware changes.This cost-effective upgrade effectively promotes the deployment of MDI networks as a step of untrusted node networks while taking full advantage of existing networks.In addition,the diversified demands on security and bandwidth are satisfied,and network survivability is improved.
基金This work has been supported by the National Key Research and Development Program of China(Grant Nos.2016YFA0302600)the National Natural Science Foundation of China(Grant Nos.61822115,61775207,61961136004),and Anhui Initiative in Quantum Informa-tion Technologies.
文摘The main obstacle of realizing long-distance quantum key distribution(QKD)[1]is that the secret key rate(SKR)decreases with the loss of the quantum channel.Specifically,the transmittanceηof a quantum channel depends on its distance,namelyη=10^(−αl/10),whereα=0.2dB/km for a typical fiber channel,and l is the distance of the channel.For most single-photon-based QKD protocols,including the well-known BB84[1].
