India's Defence Research and Development Organisation (DRDO) and the Indian Institute of Technology Delhi (IIT Delhi) have successfully demonstrated free-space quantum secure communication using quantum entanglement over a distance exceeding one kilometer. This experimental achievement marks a significant advancement in quantum cybersecurity, enabling secure communication without the need for optical fiber cables. The technology leverages entangled photons transmitted through open air, making the communication link resistant to hacking and interception, as any attempt to eavesdrop can be detected. This breakthrough paves the way for developments in quantum cyber security, quantum networks, and the future quantum internet. It holds particular promise for applications in defense, finance, and secure military communications, potentially ushering in unbreakable encryption methods and contributing to India's progress in the global race for quantum supremacy.