New Delhi, June 17 -- 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.

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.

The demonstration, led by Prof. Bhaskar Kanseri's 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.

This entanglement-assisted quantum key distribution (Q...