A simple proof of the unconditional security of quantum key distribution

Abstract

Quantum key distribution is the most well-known application of quantum cryptography. Previous proposed proofs of security of quantum key distribution contain various technical subtleties. Here, a conceptually simpler proof of security of quantum key distribution is presented. The new insight is the invariance of the error rate of a teleportation channel: We show that the error rate of a teleportation channel is independent of the signals being transmitted. This is because the non-trivial error patterns are permuted under teleportation. This new insight is combined with the recently proposed quantum to classical reduction theorem. Our result shows that assuming that Alice and Bob have fault-tolerant quantum computers, quantum key distribution can be made unconditionally secure over arbitrarily long distances even against the most general type of eavesdropping attacks and in the presence of all types of noises.

13 pages, extended abstract. Comments will be appreciated

References in corpus (4)

• Simple Proof of Security of the BB84 Quantum Key Distribution Protocol
• Unconditional Security Of Quantum Key Distribution Over Arbitrarily Long Distances
• Quantum repeaters based on entanglement purification
• From Quantum Cheating to Quantum Security

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