CLASSICAL MESSAGING CANNOT REPLACE A QUANTUM COMMUNICATION CHANNEL

• A no-go theorem proving that no finite amount of classical communication can faithfully simulate a quantum communication channel when multiple senders are involved.
• Establishes a hard, mathematical boundary between classical and quantum information processing, reinforcing the concept of quantum advantage.
• Relevant for UPSC under Science & Tech (GS-III): quantum technologies, National Quantum Mission, indigenous fundamental research, and India’s positioning in quantum communications.