India's Defence Research and Development Organisation (DRDO) in collaboration with the Indian Institute of Technology Delhi (IIT Delhi) has successfully demonstrated free-space quantum secure communication using quantum entanglement over a distance exceeding one kilometer. This experimental setup, achieved through the DRDO-Industry-Academia Centre of Excellence (DIA-CoE) at IIT Delhi, enables secure communication without relying on optical fiber cables. The technology leverages entangled photons, pairs of light particles that remain interconnected across open air, allowing instantaneous correlation between measurements. This breakthrough paves the way for advancements in quantum cybersecurity, quantum networks, and the future quantum internet. The system is designed to be hack-proof, preventing interception or espionage even with advanced hacking tools, which marks a significant step forward for secure communications in defense, finance, and other critical sectors. The achievement is viewed as a game-changer in India's pursuit of quantum supremacy and secure communication technologies.