Overview

• Isro recently demonstrated entanglement-based quantum-secure communication over a 300 metre free-space link that successfully transmitted encrypted video using quantum keys.
• In collaboration with IIT Delhi, DRDO achieved hack-proof quantum communication across a one-kilometre optical channel.
• Both experiments rely on quantum key distribution to detect any eavesdropping attempt by monitoring disturbances in entangled particle states.
• These milestones form the foundation for India’s planned national quantum communication grid to secure critical infrastructure and military networks.
• The developments position India within a global race led by China’s Micius satellite, which currently supports quantum links exceeding 1,200 kilometres.