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Quantum key distribution (QKD) ensures secure communication based on the principles of quantum ________.
- Entanglement
- Superposition
- Uncertainty
- All of these
Answer: All of these
QKD (e.g., BB84 protocol) uses quantum properties: any eavesdropping disturbs quantum states (uncertainty), detectable by legitimate users. Enables theoretically unbreakable encryption. India's National Quantum Mission supports R&D. [[DST Reports]]