Abstract
In the original Bennett-Brassard 1984 protocol, the bit basis and the phase basis are used with equal probability. Lo et al. [J. Cryptology 18, 133 (2005)] proposed modifying the ratio between the two bases by increasing the final key generation rate. However, the optimum ratio has not yet been derived. In this Rapid Communication, in order to examine this problem, the ratio between the two bases is optimized for exponential constraints, given Eve’s information distinguishability and the final error probability.
- Received 4 June 2008
DOI:https://doi.org/10.1103/PhysRevA.79.020303
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