ID Quantique’s white paper explains Quantum Key Distribution (QKD) as a quantum-safe method for exchanging encryption keys, immune to advances in computing or mathematics. Exploiting quantum physics—where observation disturbs quantum states—QKD ensures any eavesdropping is detectable. Using single photons over optical fiber or free space, QKD provides provably secure, future-proof key exchange, complementing AES for data confidentiality. Challenges like range limits are addressed with trusted nodes, satellites, and quantum repeaters. IDQ’s commercial QKD systems serve finance, government, and telecom sectors, paving the way for global quantum-secure networks.

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