Unconditional Security Of Quantum Key Distribution Over Arbitrarily Long Distances

Details Unconditional Security Of Quantum Key Distribution Over Arbitrarily Long Distances Unconditional Security Of Quantum Key Distribution Over Arbitrarily Long Distances

1998-03-03

arxiv.org/abs/quant-ph/9803006v5

Science 283 (1999) 2050-2056

Physics

Quantum Physics

This reprint version contains the same material as the one published in Science 283, 2050-2056 (1999). We also include the ref

Scientific paper

10.1126/science.283.5410.2050

Quantum key distribution is widely thought to offer unconditional security in communication between two users. Unfortunately, a widely accepted proof of its security in the presence of source, device and channel noises has been missing. This long-standing problem is solved here by showing that, given fault-tolerant quantum computers, quantum key distribution over an arbitrarily long distance of a realistic noisy channel can be made unconditionally secure. The proof is reduced from a noisy quantum scheme to a noiseless quantum scheme and then from a noiseless quantum scheme to a noiseless classical scheme, which can then be tackled by classical probability theory.

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