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

Abstract

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

References in corpus (5)

• Quantum information with Gaussian states
• Upper bounds of eavesdropper's performances in finite-length code with decoy method
• Secure and efficient decoy-state quantum key distribution with inexact pulse intensities
• General theory for decoy-state quantum key distribution with arbitrary number of intensities
• Simple protocol for secure decoy-state quantum key distribution with a loosely controlled source