MUMBAI, India, June 22 -- Intellectual Property India has published a patent application (202541054148 A) filed by Indian Institute Of Technology Madras Iit Madras; and Centre For Development Of Advanced Computing on June 04, 2025, for System And Method For Cost-Effective And Time-Efficient Key Relaying In Long-Distance Quantum Key Distribution.
Inventors include Anil Prabhakar; Vaibhav Pratap Singh; and Ashutosh Kumar Singh.
The application for the patent was published on June 12, 2026, under issue no. 24/2026.
Abstract: ABSTRACT SYSTEM AND METHOD FOR COST-EFFECTIVE AND TIME-EFFICIENT KEY RELAYING IN LONG-DISTANCE QUANTUM KEY DISTRIBUTION The present invention relates to a trusted relay Quantum Key Distribution (QKD) network system (100) and method for secure long-distance quantum communication. The system comprises alternating standalone QKD transmitter (Alice) nodes and QKD receiver (Bob) nodes, themselves acting as trusted relay nodes, interconnected through quantum communication links (102) and key manager classical communication links (104), thereby reducing hardware complexity, size, weight, and power requirements. A centralized control/decentralized control/QKD-SDN controller (106) coordinates hierarchical but adaptive key generation, relay synchronization, and multi-hop key propagation across the communication network. A recursive multi-stage XOR key stitching process enables secure multi-hop key establishment while reducing trust dependency on intermediate relay nodes. The disclosed architecture enables scalable and time-efficient end-to-end quantum key establishment over multi-hop communication paths and is compatible with existing QKD hardware and communication infrastructures. Figure. 1
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