Quantum Cryptographic Network Caching for Key Resource Bottlenecks
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Solution Overview
Problem
Conventional quantum cryptographic communication systems are limited by the constrained generation rate of quantum keys, leading to depletion of resources and reduced performance when communication load is concentrated on specific nodes, necessitating more efficient utilization of quantum key resources.
Innovation Solution
Implementing a cache server in strategically selected nodes within the quantum cryptographic communication network to store data, reducing the demand for quantum keys by processing service requests using cached data, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum key distribution is used for secure communication, then communication security is improved, but quantum key resources are depleted quickly leading to performance degradation
Solution Approach 1:
The patent pre-calculates weights for all nodes based on their quantum key demand and communication characteristics before deployment. This preliminary assessment allows the system to proactively identify which nodes should host cache servers, preventing quantum key depletion before it occurs rather than reacting after resources are exhausted
Solution Approach 2:
The patent introduces cache servers as intermediary components between quantum key distribution nodes and application nodes. These cache servers store frequently accessed data locally, allowing nodes to retrieve data without requiring additional quantum key exchanges, thus mediating between the need for secure communication and the limited quantum key resources
2Productivity
If communication load is concentrated on specific nodes, then service efficiency is improved, but quantum key resources at those nodes are depleted faster
Solution Approach 1:
The patent applies local quality by deploying cache servers selectively at specific nodes based on their calculated weights, rather than uniformly across all nodes. Nodes with high communication load and quantum key demand receive cache server deployment, while other nodes do not. This localized approach optimizes resource distribution according to actual needs
Solution Approach 2:
The patent changes the parameter of node capacity by dynamically assessing each node's quantum key demand, communication traffic patterns, and number of users. These parameter changes allow the system to identify which nodes can benefit from cache servers, transforming the static resource allocation into a dynamic, demand-driven distribution
3Quantity of substance
If cache servers are deployed at all nodes, then quantum key resource utilization is improved, but system complexity and deployment cost increase
Solution Approach 1:
The patent applies partial action by deploying cache servers at only a subset of nodes rather than all nodes. The weight calculation identifies which specific nodes would benefit most from cache server deployment, allowing partial optimization without the complexity and cost of universal deployment. This selective approach achieves significant resource utilization improvement with minimal system complexity increase
Data Source
AI summary
The present disclosure relates to a method, a device, and a computer program for constructing a quantum cryptographic communication network. More specifically, the present disclosure provides a method for constructing, in a device, a quantum cryptographic communication network including multiple unit nodes which include multiple quantum cryptographic communication unit nodes, including application nodes and quantum key distribution nodes, and one or more relay unit nodes configured to relay between the quantum key distribution nodes, the method including: calculating, for one or more target unit nodes among the multiple unit nodes, a weight reflecting a quantum key demand at the target unit nodes according to communication between the application nodes among the multiple quantum cryptographic communication unit nodes; and selecting one or more unit nodes, which are to be provided with cache servers for the communication between the application nodes, from among the target unit nodes based on the calculated weight.