India’s First 5.56 km Free‑Space Quantum Key Distribution Link Demonstrated

QNu Labs, in collaboration with the Bhaskaracharya National Institute for Space Applications and Geo-informatics (BISAG-N) and IIT Gandhinagar, successfully demonstrated India's first 5.56 km free-space Quantum Key Distribution (QKD) link. Conducted between BISAG-N and IIT Gandhinagar, the field trial achieved a stable Quantum Bit Error Rate below 5% and generated secure keys integrated with BISAG-N's Vedic Kavach platform. The architecture combined QNu Labs' Armos hardware-based QKD device with Vedic Kavach's software-based post-quantum cryptography, aiming to strengthen resilience against quantum-era security threats and advance India's secure communication infrastructure.