Exact minimum and maximum of yield with a finite number of decoy light intensities

Tsurumaru, Toyohiro; Soujaeff, Alexandre; Takeuchi, Shigeki

Exact minimum and maximum of yield with a finite number of decoy light intensities

Authors

Tsurumaru, Toyohiro

Soujaeff, Alexandre

Takeuchi, Shigeki

Description

In this paper, for the decoy state method using a finite number of decoy light intensities, we present an improved upper and lower bounds for the asymptotic yield y_n for n-photon states. In particular if all the light intensities are less than or equal to one, they are not only a lower or upper bound, but in fact are the exact minimum or maximum.
20 pages, 2 figures