- Researchers at IIT-Gandhinagar successfully demonstrated a free-space quantum communication link over a distance of 5.5 kilometres through the air. - The demonstration highlights advancements in secure quantum key distribution (QKD) using atmospheric channels instead of optical fibers. - Free-space quantum links overcome the high attenuation and infrastructure limitations of long-distance fiber-optic cables, paving the way for satellite-based and inter-city quantum communication networks. - This aligns with India's broader technological objectives under the National Quantum Mission (NQM) to build indigenous quantum cryptographic capabilities. - **National Quantum Mission:** An ambitious initiative by the Government of India launched to foster scientific R&D, develop quantum computing, communication, and sensing technologies, and bolster national security and technological self-reliance. - **IIT-Gandhinagar:** A premier technological institute in India whose researchers recently demonstrated a pathbreaking free-space quantum key distribution link over 5.5 kilometres of open air. **Introduction** Scientists at IIT-Gandhinagar have successfully demonstrated a quantum communication link over 5.5 kilometres of open air. This achievement marks a crucial step forward for free-space quantum key distribution (QKD), enabling secure communications without relying solely on optical fiber infrastructure, and bolstering India's strategic capabilities under the National Quantum Mission. **Core Issue and Detailed Points** - Researchers at IIT-Gandhinagar successfully demonstrated a free-space quantum communication link over a distance of 5.5 kilometres through the air. - The demonstration highlights advancements in secure quantum key distribution (QKD) using atmospheric channels instead of optical fibers. - Free-space quantum links overcome the high attenuation and infrastructure limitations of long-distance fiber-optic cables, paving the way for satellite-based and inter-city quantum communication networks. - This aligns with India's broader technological objectives under the National Quantum Mission (NQM) to build indigenous quantum cryptographic capabilities. **Key Statutory Bodies, Acts & Concepts** - **National Quantum Mission:** An ambitious initiative by the Government of India launched to foster scientific R&D, develop quantum computing, communication, and sensing technologies, and bolster national security and technological self-reliance. - **IIT-Gandhinagar:** A premier technological institute in India whose researchers recently demonstrated a pathbreaking free-space quantum key distribution link over 5.5 kilometres of open air.