ENA Sectors 2025-06-17 15:56:15 <p><span style="font-size:14px"><strong>New Delhi, Jun 17 (KNN)</strong> India marked a significant milestone in quantum technology with the successful demonstration of free-space quantum secure communication by the DRDO-Industry-Academia Centre of Excellence (DIA-CoE) at IIT Delhi. </span></p> <p><span style="font-size:14px">The experiment, conducted on the IIT Delhi campus, achieved quantum entanglement-based secure communication over a free-space optical link spanning more than one kilometre.</span></p> <p><span style="font-size:14px">The demonstration, led by Prof. Bhaskar Kanseris research group under the DRDO-sanctioned project Design and Development of Photonic Technologies for Free Space QKD, attained a secure key rate of approximately 240 bits per second with a quantum bit error rate of less than 7 percent. </span></p> <p><span style="font-size:14px">This entanglement-assisted quantum key distribution (QKD) marks a foundational step towards real-time quantum cybersecurity applications, including the development of quantum networks and a future quantum internet.</span></p> <p><span style="font-size:14px">The technology leverages the unique properties of quantum entanglement, which ensures that any attempt to intercept or measure communication is immediately detectable&mdash;enhancing both the security and robustness of encryption. </span></p> <p><span style="font-size:14px">Unlike traditional prepare-and-measure methods, entanglement-based QKD remains secure even in the presence of compromised or imperfect devices, making it highly suitable for critical sectors such as defence, finance, telecommunications, and national security.</span></p> <p><span style="font-size:14px">One key advantage of free-space QKD is the elimination of costly and disruptive optical fibre installations, especially in difficult terrains and urban areas. </span></p> <p><span style="font-size:14px">The current demonstration follows a series of quantum advances by the same team, including Indias first intercity quantum link between Vindhyachal and Prayagraj in 2022, and a 100-km fiber-based quantum key distribution test conducted in 2024.</span></p> <p><span style="font-size:14px">These developments are part of a broader effort to foster indigenous research and innovation through DRDOs Centres of Excellence, established at 15 premier institutions including IITs and IISc, aimed at advancing next-generation defence technologies.</span></p> <p><em><strong><span style="font-size:14px">(KNN Bureau)</span></strong></em></p> 42479 https://knnindia.co.in/news/newsdetails/sectors/drdoiit-delhi-achieve-quantum-entanglement-based-secure-communication-over-1-km-link 2025-06-17 15:56:15 knnindia.co.in