Intellectual Property India Publishes Patent Application for A Quantum Key Distribution Network Architecture With Adaptive Key-State-Aware Routing And Secure Route-Epoch Synchronization

MUMBAI, India, Oct. 5 -- Intellectual Property India has published a patent application (202641115613 A) filed by Mr. C. Kumaraswamireddy; Mr. C. Hariprasad; Ms. J. Rajalakshmi; Mr. Pochampally Chandra Sekhar Reddy; Mr. Amarnath K; Ms. Khateeja Samrin; Dr. S. Nalini; Dr. Ramadoss R; Mrs. A. Angeline Valentina Sweety; and Dr. Ch. Babji Prasad on September 26, 2026, for A Quantum Key Distribution Network Architecture With Adaptive Key-State-Aware Routing And Secure Route-Epoch Synchronization.

Inventors include Mr. C. Kumaraswamireddy; Mr. C. Hariprasad; Ms. J. Rajalakshmi; Mr. Pochampally Chandra Sekhar Reddy; Mr. Amarnath K; Ms. Khateeja Samrin; Dr. S. Nalini; Dr. Ramadoss R; Mrs. A. Angeline Valentina Sweety; and Dr. Ch. Babji Prasad.

The application for the patent was published on October 02, 2026, under issue no. 40/2026.

Abstract: The present invention provides a quantum key distribution (QKD) network architecture comprising a plurality of QKD nodes, quantum communication links, key management modules, an adaptive QKD controller and a route-epoch synchronizer. The architecture obtains quantum-link and key-resource parameters including quantum bit error rate, key generation rate, available key reserve, key freshness and node or link availability, and converts selected parameters into key-state fingerprints. Candidate communication paths are evaluated using the key-state fingerprints and a composite path-selection mechanism that considers quantum-link condition and key-resource consumption. A selected path is associated with a route epoch and a route commitment state, and participating key management nodes validate the route epoch before performing key relay or key delivery. When a quantum link or key resource enters a degraded condition, the affected route can be isolated and an alternative route can be selected using a new route epoch. The architecture thereby synchronizes route decisions with changing quantum-channel and key-management conditions while reducing stale route use, unnecessary key consumption and repeated global route computation. The architecture is applicable to trusted-node, distributed and hybrid QKD networks. Accompanied Drawing [FIGS. 1-2].

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