QKD Switching Hub Using Shared Quantum and Classical Channels
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Solution Overview
Problem
Existing quantum key distribution (QKD) systems face challenges in scaling to multiple endpoints due to distance limitations, complexity, and high costs, particularly in terrestrial networks, making it difficult to deploy secure communications systems like BB84 QKD protocols effectively.
Innovation Solution
A QKD linking apparatus that provides QKD communication links with a quantum and classical channel, acting as a hub to connect multiple endpoints, allowing secure key exchange and data routing, and minimizing equipment and fiber usage, enabling deployment in various trust levels and environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If satellite QKD technology is used to achieve global coverage, then security coverage is improved, but cost and system complexity increase significantly
Solution Approach 1:
The patent introduces trusted nodes as intermediary devices that relay quantum keys between endpoint devices. Instead of requiring direct satellite-to-ground links for all communications, the trusted nodes act as mediators that receive, store, and forward quantum keys, thereby extending coverage while maintaining manageable system complexity at each node.
Solution Approach 2:
The patent divides the QKD network into segmented components: endpoint devices, trusted nodes, and quantum switches. Each component performs a specific function, allowing the system to scale by adding individual nodes rather than requiring complete system redesign. This segmentation reduces overall system complexity while expanding coverage.
2Adaptability or versatility
If optical switches or beam-splitters are used to route quantum signals in a mesh network, then connectivity is improved, but scaling to thousands of endpoints becomes difficult
Solution Approach 1:
The patent introduces quantum switches as intermediary devices that simplify routing in mesh networks. These quantum switches are designed to handle quantum signal routing efficiently, reducing the complexity of scaling to thousands of endpoints by providing standardized, manageable routing nodes rather than requiring complex direct peer-to-peer connections.
Solution Approach 2:
The quantum switches and trusted nodes are designed as universal components that can serve multiple functions: routing quantum signals, storing keys, and relaying communications. This multi-functionality reduces the number of specialized components needed, making it easier to scale the network to thousands of endpoints.
3Length of stationary object
If terrestrial QKD links are used with trusted nodes, then distance limitations are addressed, but node location constraints increase
Solution Approach 1:
The patent implements dynamic key management where trusted nodes can be dynamically added, removed, or repositioned based on network needs. The quantum key distribution protocol allows for flexible node placement by enabling keys to be generated and distributed dynamically, rather than requiring fixed, pre-planned node locations. This dynamic approach maintains distance coverage while improving location flexibility.
Data Source
AI summary
A quantum key distributed (QKD) apparatus for use with at least two endpoint devices, the apparatus including QKD links each having a communication medium with a quantum channel and a classical channel, wherein each endpoint has a QKD link connected to the QKD apparatus; transmitters to transmit quantum transmissions over a quantum channel of one of the QKD links; a classical transceiver component to transmit/receive classical data over a classical channel of one of the QKD links; and a controller to route data for quantum transmission to an endpoint via a transmitter assigned to the endpoint over a quantum channel of the QKD link of the endpoint, route classical data to an endpoint via a classical transceiver assigned to the endpoint 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.