Quantum Key Distribution (QKD) for satellite networks enables ultra-secure communication by leveraging quantum mechanics to generate and transmit encryption keys. It prevents eavesdropping through photon-based encoding and quantum entanglement, with any interception attempt immediately altering the key and triggering alerts. Satellite-based QKD addresses the range limitations of terrestrial fiber optics, making global quantum communication feasible. Use cases span defense, banking, critical infrastructure, and diplomatic channels. Emerging standards, hybrid quantum-classical systems, and interoperability challenges shape the deployment roadmap as nations invest heavily in space-based quantum technologies .
