Improved one-way rates for BB84 and 6-state protocols

Details Improved one-way rates for BB84 and 6-state protocols Improved one-way rates for BB84 and 6-state protocols

2007-12-10

arxiv.org/abs/0712.1494v2

Quantum Information & Computation, Vol.8, No.8/9, pp0756-0772, (2008)

Physics

Quantum Physics

17 pages, to appear in Quantum Information & Computation. Replaced by accepted version

Scientific paper

We study the advantages to be gained in quantum key distribution (QKD) protocols by combining the techniques of local randomization, or noisy preprocessing, and structured (nonrandom) block codes. Extending the results of [Smith, Renes, and Smolin, quant-ph/0607018] pertaining to BB84, we improve the best-known lower bound on the error rate for the 6-state protocol from 14.11% for local randomization alone to at least 14.59%. Additionally, we also study the effects of iterating the combined preprocessing scheme and find further improvements to the BB84 protocol already at small block lengths.

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