India, April 17 -- In a landmark achievement, C-DOT, jointly with Sterlite Technologies Limited (STL), has successfully tested India's first QKD transmission over a 4-core Multi-Core Fibre (MCF) - marking a major milestone in the nation's journey towards quantum-secured communication networks.Multi-Core Fibre (MCF) technology provides a powerful solution by enabling data transmission across multiple cores within a single fibre, significantly saving physical space and infrastructure costs. In the context of QKD - which typically requires a dedicated dark fibre for the quantum channel, MCF offers a significant advantage: it enables the physical separation of quantum and classical signals into distinct cores within single fibre. This allows fo...