Optimal ratio between phase basis and bit basis in QKD

Details Optimal ratio between phase basis and bit basis in QKD Optimal ratio between phase basis and bit basis in QKD

2008-05-21

arxiv.org/abs/0805.3190v2

Physical Review A, Vol. 79, 020303(R) (2009)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevA.79.020303

In the original BB84 protocol, the bit basis and the phase basis are used with equal probability. Lo et al (J. of Cryptology, 18, 133-165 (2005)) proposed to modify the ratio between the two bases by increasing the final key generation rate. However, the optimum ratio has not been derived. In this letter, 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.

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