The DRDO Industry Academia-Centre of Excellence (DIA-CoE), IIT Delhi demonstrated quantum communications technologies in New Delhi. It has been developed by their collaborative initiative of the entanglement-based quantum key distribution approaches for robust and secure communication, demonstrating entanglement distribution and quantum key distribution (QKD) over a 50 km fiber link in laboratory. A separate field test has demonstrated entanglement distribution and QKD over 8 km of optical fiber in IIT Delhi campus, said the Ministry of Defence in a press release on Tuesday.