QKD Hub-and-Spoke Switching for Scalable Multi-Endpoint Key Routing
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Solution Overview
Problem
Current QKD technologies face challenges in scaling secure communications to multiple endpoints due to distance limitations, complexity, and high costs, particularly in terrestrial and satellite-based systems, making it difficult to create a scalable and cost-effective QKD network.
Innovation Solution
A QKD linking apparatus that uses a hub-and-spoke architecture with dedicated quantum and classical channels for each endpoint, enabling secure key exchange and data routing between multiple endpoints, allowing for flexible trust levels and reduced equipment requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite QKD technology is used for global coverage, then coverage area is improved, but device complexity and cost increase significantly
Solution Approach 1:
The system segments the QKD network into multiple ground-based nodes that each perform QKD independently, rather than requiring complex satellite-based QKD transmitters/receivers. This divides the global coverage function into smaller, manageable terrestrial segments that can be deployed more simply.
Solution Approach 2:
The patent introduces trusted nodes as intermediaries that facilitate secure communication between endpoints without requiring direct satellite-to-ground QKD links. These intermediate nodes perform key distribution and routing functions that would otherwise require complex satellite technology.
2Ease of operation
If trusted nodes are used as repeaters in mesh QKD architecture, then key distribution is enabled, but location flexibility is reduced due to distance limitations
Solution Approach 1:
The system creates a universal QKD network architecture where trusted nodes can serve multiple functions: key distribution, routing, and relaying. This multi-functionality allows the same node infrastructure to support various configurations and locations without requiring specialized equipment for each function.
Solution Approach 2:
The patent extends the QKD network into a multi-dimensional architecture that includes hierarchical levels (endpoints, trusted nodes, core network) and multiple routing paths. This dimensional expansion allows nodes to be placed more flexibly by utilizing alternative routing dimensions rather than being constrained by direct line-of-sight distance limitations.
3Ease of operation
If optical switches or beam-splitters are used for quantum signal switching, then signal routing is achieved, but network scalability to thousands of endpoints is difficult
Solution Approach 1:
The system replaces physical optical switching mechanisms with a software-controlled routing architecture based on pre-distributed quantum keys. Instead of mechanically switching optical signals at each endpoint, the network uses cryptographic key management to enable or disable communication paths, substituting mechanical/optical switching with information-theoretic control.
Solution Approach 2:
The system performs preliminary key distribution between all pairs of endpoints and trusted nodes before actual communication begins. This pre-computation of quantum keys enables rapid, scalable routing decisions without requiring real-time optical switching complexity, as the routing logic simply selects from pre-established key pairs.
Data Source
AI summary
A quantum key distributed (QKD) apparatus for linking endpoint devices in a network, which includes: QKD links each including a quantum channel and a classical channel, wherein each endpoint has a QKD link; quantum transmitters to transmit quantum transmissions over a quantum channel of one of the QKD links; classical transceivers to transmit classical data over a classical channel of one of the QKD links and to receive classical data over the classical channel of said QKD link; and a controller connected to the quantum transmitters and the classical transceivers to route data generated for quantum transmission to an endpoint over a quantum channel of the QKD link of the endpoint; route classical data for classical transmission to an endpoint via a classical transceiver over a classical channel of the QKD link of the endpoint; and route classical data over the classical channel of the QKD link of an endpoint.