Which core technology underpins QNu Labs’ 500-km quantum communication network, demonstrated recently to enable ultra-secure data transmission?
Quantum Key Distribution (QKD)
Quantum Key Distribution (QKD) is a method of sharing secret encryption keys using single photons. Because measuring a quantum state disturbs it, any eavesdropper on the channel can be detected, which makes the exchange of keys ultra-secure.
Step 1 — In November 2025, the Department of Science and Technology announced that QNu Labs, a Bengaluru start-up supported under the National Quantum Mission, had demonstrated India's first quantum-safe network of about 500 km.
Step 2 — The network ran over existing optical fibre in the Rajasthan sector, with trusted nodes enabling end-to-end quantum key exchange along the route. Its core technology was therefore QKD.
Step 3 — Satellite-based broadband is a conventional internet service, classical encryption over fibre relies on mathematical hardness rather than quantum physics, and 5G VPN tunnels are ordinary mobile-network security; none of these is the quantum technology behind the QNu Labs network.
Quantum Key Distribution (QKD) option is correct.
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