India achieves 5.56-km free-space Quantum Key Distribution link
cellit.in Oct 5, 2026

India achieves 5.56-km free-space Quantum Key Distribution link

AI-summarised brief · reviewed before publication

India successfully demonstrated a 5.56‑km free‑space Quantum Key Distribution (QKD) link between BISAG‑N and IIT Gandhinagar on September 27‑28, using QNu Labs’ Armos QKD device and a Pointing, Acquisition and Tracking system. The trial maintained a Quantum Bit Error Rate below five percent and generated secure keys at 230‑260 bits per second, which were integrated with BISAG‑N’s Vedic Kavach post‑quantum cryptography platform for end‑to‑end encryption. The collaboration combined hardware‑based QKD with software‑based post‑quantum security, showcasing a resilient architecture for future quantum‑secure networks.

💡 Why It Matters

  • · The field test validates India’s capability to deploy practical quantum‑secure links without fiber, paving the way for satellite‑based quantum communication and strengthening national resilience against quantum‑era cyber threats.