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This field trial validates the feasibility of long-distance free-space Quantum Key Distribution (QKD) in atmospheric conditions, achieving a stable 5.56 km link with secure key rates suitable for real-world deployment. By integrating quantum channels with post-quantum cryptography and robust tracking systems, the demonstration establishes a hybrid security architecture that remains functional even if the quantum channel is temporarily unavailable. This milestone marks a significant step forward in practical quantum communication infrastructure, moving beyond theoretical proofs to operational field trials.

Source coveringThe Quantum Insider

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QNu Labs, BISAG-N and IIT Gandhinagar Demonstrate 5 km-Scale Free-Space QKD Link

The Quantum InsiderOctober 5, 20264 min read

Insider Brief PRESS RELEASE — QNu Labs (www.qnulabs.com), a global leader in end-to-end hybrid quantum cybersecurity solutions, along with the Bhaskaracharya National Institute for Space Applications and Geo-informatics (BISAG-N), and IIT Gandhinagar, have successfully completed a 5.56 km free-space Quantum Key Distribution (QKD) field trial, marking India’s first free-space QKD link at the 5 km […]

QNu Labs, BISAG-N and IIT Gandhinagar completed a 5.56-kilometer free-space quantum key distribution trial, integrating keys transmitted through the atmosphere with a post-quantum cryptography application. The link achieved a secure key rate of 230–260 bits per second with a quantum bit error rate below 5%, supporting successful encryption, transmission and decryption of a test message. The hybrid system combined quantum key distribution with post-quantum cryptography and quantum…

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