CN-122001567-A - Quantum key distribution method and quantum key distribution system

CN122001567ACN 122001567 ACN122001567 ACN 122001567ACN-122001567-A

Abstract

The application discloses a quantum key distribution method and a quantum key distribution system. The quantum key distribution method comprises the steps of responding to a service requirement sent by a received first service terminal, determining a quantum key distribution target scheduling path according to a first network state and the service requirement, and sending a quantum key scheduling instruction to a target ground quantum key distribution network and/or a target non-ground quantum key distribution network based on the target scheduling path. Therefore, through overall scheduling of the global resources, unified management and optimal configuration of the global quantum key distribution resources are realized, the transmission distance bottleneck that a single ground quantum key distribution network is limited by optical fiber loss is effectively broken through, and the inherent short plates with fixed coverage range meet the service requirements that the ground quantum key distribution network is difficult to touch in a cross-region mode, and the overall utilization rate of the key resources and the satisfaction rate of user requests are improved.

Inventors

HUANG CHAONAN

Assignees

中电信量子信息科技集团有限公司

Dates

Publication Date: 20260508
Application Date: 20251218

Claims (10)

1. A method of quantum key distribution, the method comprising: responding to a received service demand sent by a first service terminal, and determining a quantum key distribution target scheduling path according to a first network state and the service demand, wherein the first network state is determined by a second network state reported by a ground quantum key distribution network and a third network state reported by a non-ground quantum key distribution network; And issuing a quantum key dispatching instruction to a target ground quantum key dispatching network and/or a target non-ground quantum key dispatching network based on the target dispatching path, wherein the target ground quantum key dispatching network and/or the target non-ground quantum key dispatching network generate a quantum key according to the quantum key dispatching instruction and dispatch the quantum key to the first service terminal and the second service terminal.
2. The method of claim 1, wherein the determining a target scheduling path for quantum key distribution based on the first network state and the traffic demand in response to the received traffic demand sent by the traffic terminal comprises: Determining at least one candidate scheduling path according to the service demand; Determining a link dynamic weight score of the candidate scheduling path according to the first network state, wherein the smaller the link dynamic weight score is, the higher the demand degree matching degree between the candidate scheduling path and the service demand is; And determining the target scheduling path according to the link dynamic weight score, wherein the target scheduling path is the one with the smallest link dynamic weight score in the candidate scheduling paths.
3. The method of claim 2, wherein said determining a link dynamic weight score for said candidate scheduling path based on said first network state comprises: And normalizing the first key generation rate, the first link availability state, the first link overhead cost and the first historical stability score to convert the first key generation rate, the first link availability state, the first link overhead cost and the first historical stability score to [0,1] to obtain a second key generation rate, a second link availability state, a second link overhead cost and a second historical stability score, wherein the first network state comprises the first key generation rate, the first link availability state, the first link overhead cost and the first historical stability score.
4. The method of claim 3, wherein the higher the generation rate of the first key generation rate, the lower the value of the second key generation rate, the higher the availability of the first link availability status, the lower the value of the second link availability status, the lower the first link overhead cost, the lower the value of the second link overhead cost, the higher the first historical stability score, and the lower the value of the second historical stability score.
5. The method of claim 3, wherein said determining a link dynamic weight score for said candidate scheduling path based on said first network state comprises: Respectively determining the second key generation rate, the second link availability state, the second link overhead cost and the weight coefficient corresponding to the second historical stability score according to the service demand; And determining the link dynamic weight score according to the second key generation rate, the second link availability state, the second link overhead cost, the second historical stability score and the weight coefficient.
6. The method of claim 5, wherein the higher the key generation rate requirement of the service requirement, the greater the weight coefficient corresponding to the second key generation rate, the higher the link availability status requirement of the service requirement, the greater the corresponding weight coefficient, the more stringent the control requirement of the overhead cost of the service requirement, the greater the weight coefficient corresponding to the overhead cost of the second link, the greater the historical stability score requirement of the service requirement on the link, and the greater the weight coefficient corresponding to the second historical stability score.
7. The method according to claim 1, wherein said issuing quantum key scheduling instructions to a target terrestrial quantum key distribution network and/or a target non-terrestrial quantum key distribution network based on said target scheduling path comprises: Issuing the quantum key scheduling instruction to the target ground quantum key distribution network, wherein a first city node in the target ground quantum key distribution network generates a quantum key according to the quantum key scheduling instruction and transmits the quantum key to a second city node through a relay node, the second city node transmits the quantum key to the second service terminal, the first city node is a city node of a first city in which the first service terminal is located, and the second city node is a city node of a second city in which the second service terminal is located, or Issuing the quantum key scheduling instruction to the target non-terrestrial quantum key distribution network, wherein a first satellite, a first ground station and a second ground station in the target non-terrestrial quantum key distribution network generate a quantum key according to the quantum key scheduling instruction, the first ground station transmits the quantum key to the first service terminal, the second ground station transmits the quantum key to the second service terminal, the first ground station is a ground station of a third city in which the first service terminal is located, and the second ground station is a ground station of a fourth city in which the second service terminal is located, or Issuing a quantum key dispatching instruction to the target ground quantum key dispatching network and the target non-ground quantum key dispatching network, wherein the second satellite, the third ground station and the fourth ground station in the target non-ground quantum key dispatching network generate a quantum key according to the quantum key dispatching instruction, the third ground station sends the quantum key to a fifth city node, the fourth ground station sends the quantum key to a sixth city node, the fifth city node sends the quantum key to the first service terminal, the sixth city node sends the quantum key to the second service terminal, the third ground station is a ground station of a fifth city in which the first service terminal is located, the fourth ground station is a ground station of a sixth city in which the second service terminal is located, the fifth city node is a city node of the fifth city in which the first service terminal is located, and the sixth city node is a city node of the sixth city in which the second service terminal is located.
8. The method according to claim 1, wherein said issuing quantum key scheduling instructions to a target terrestrial quantum key distribution network and/or a target non-terrestrial quantum key distribution network based on said target scheduling path comprises: and under the condition that the quantum key synchronous distribution is completed, a quantum key distribution resource release instruction is issued to the target ground quantum key distribution network and/or the target non-ground quantum key distribution network.
9. The method according to claim 1, wherein the method further comprises: monitoring a fourth network state of the target scheduling path and the service requirement in real time; And re-determining the target scheduling path under the condition that the fourth network state does not meet the service requirement and/or the service requirement is changed.
10. A quantum key distribution system is characterized in that the system comprises a global scheduling controller, a ground quantum key distribution network, a non-ground quantum key distribution network, a first service terminal and a second service terminal, wherein, The ground quantum key distribution network is configured to report a second network state to the global scheduling controller; The non-terrestrial quantum key distribution network is configured to report a third network state to the global scheduling controller; The global schedule controller is configured to determine a first network state from the second network state and the third network state; the first service terminal is configured to send a service requirement to the global scheduling controller; The global schedule controller is configured to determine a quantum key distribution target schedule path according to the first network state and the traffic demand in response to the received traffic demand; issuing a quantum key scheduling instruction to a target ground quantum key distribution network and/or a target non-ground quantum key distribution network based on the target scheduling path; The target terrestrial quantum key distribution network and/or the target non-terrestrial quantum key distribution network are configured to generate a quantum key according to the quantum key scheduling instruction and distribute the quantum key to the first service terminal and the second service terminal.

Description

Quantum key distribution method and quantum key distribution system Technical Field The present application relates to the field of communications technologies, and in particular, to a quantum key distribution method and a quantum key distribution system. Background In a quantum key distribution network based on ground communication, quantum key distribution is limited by optical fiber loss, the transmission distance is short, the network coverage is fixed, and the service requirement is difficult to meet. Disclosure of Invention The application provides a quantum key distribution method and a quantum key distribution system. The embodiment of the application provides a quantum key distribution method, which comprises the following steps: responding to a received service demand sent by a first service terminal, and determining a quantum key distribution target scheduling path according to a first network state and the service demand, wherein the first network state is determined by a second network state reported by a ground quantum key distribution network and a third network state reported by a non-ground quantum key distribution network; And issuing a quantum key dispatching instruction to a target ground quantum key dispatching network and/or a target non-ground quantum key dispatching network based on the target dispatching path, wherein the target ground quantum key dispatching network and/or the target non-ground quantum key dispatching network generate a quantum key according to the quantum key dispatching instruction and dispatch the quantum key to the first service terminal and the second service terminal. Therefore, through overall scheduling of the global resources, unified management and optimal configuration of the global quantum key distribution resources are realized, the transmission distance bottleneck that a single ground quantum key distribution network is limited by optical fiber loss is effectively broken through, and the inherent short plates with fixed coverage range meet the service requirements that the ground quantum key distribution network is difficult to touch in a cross-region mode, and the overall utilization rate of the key resources and the satisfaction rate of user requests are improved. In some embodiments, the determining, in response to the received service requirement sent by the service terminal, a target scheduling path of quantum key distribution according to the first network state and the service requirement includes: Determining at least one candidate scheduling path according to the service demand; Determining a link dynamic weight score of the candidate scheduling path according to the first network state, wherein the smaller the link dynamic weight score is, the higher the demand degree matching degree between the candidate scheduling path and the service demand is; And determining the target scheduling path according to the link dynamic weight score, wherein the target scheduling path is the one with the smallest link dynamic weight score in the candidate scheduling paths. Therefore, objectification of scheduling path selection is achieved through quantized link dynamic weight scoring, subjectivity and blindness of path selection are avoided to a certain extent, matching of a target scheduling path and service demands is guaranteed, meanwhile, the link dynamic weight scoring can comprehensively reflect performance of the scheduling path in aspects of key generation capacity, stability, cost and the like, the selected target scheduling path can meet core demands of services, link stability and cost control can be considered, and accordingly high efficiency, reliability and economy of quantum key distribution are guaranteed to a certain extent, and quality of quantum key service is improved. In some embodiments, the determining a link dynamic weight score for the candidate scheduling path according to the first network state includes: And normalizing the first key generation rate, the first link availability state, the first link overhead cost and the first historical stability score to convert the first key generation rate, the first link availability state, the first link overhead cost and the first historical stability score to [0,1] to obtain a second key generation rate, a second link availability state, a second link overhead cost and a second historical stability score, wherein the first network state comprises the first key generation rate, the first link availability state, the first link overhead cost and the first historical stability score. Therefore, dimension differences of different parameters are eliminated through normalization processing, a reliable data basis is provided for accurate calculation of dynamic weight scores of subsequent links, and the normalized parameters can objectively reflect the influence of each original parameter on the path quality, so that scientificity and rationality of a dynamic weight scoring result of the links are