Wy. Hwang et al., Eavesdropper's optimal information in variations of Bennett-Brassard 1984 quantum key distribution in the coherent attacks, PHYS LETT A, 279(3-4), 2001, pp. 133-138
We calculate eavesdropper's optimal information on raw bits in Bennett-Bras
sard 1984 quantum key distribution (BB84 QKD) and six-state scheme in coher
ent attacks, using a formula by Lo and Chau (Science 283 (1999) 2050) with
single photon assumption. We find that eavesdropper's optimal information i
n QKD without public announcement of bases (Phys. Lett. A 244 (1998) 489) i
s the same as that of a corresponding QKD with it in the coherent attack. W
e observe a sum-rule concerning each party's information. (C) 2001 Elsevier
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