Recently, Hwang has proposed a decoy state method in quantum key distribution (QKD). In Hwang's proposal, the average photon number of the decoy state is about two. Here, we propose a new decoy state scheme using vacua or very weak coherent states as decoy states and discuss its advantages.
@article{arxiv.quant-ph/0509076,
title = {Quantum Key Distribution with Vacua or Dim Pulses as Decoy States},
author = {Hoi-Kwong Lo},
journal= {arXiv preprint arXiv:quant-ph/0509076},
year = {2007}
}
Comments
This Abstract was published in June 2004 as a conference proceeding of IEEE ISIT 2004. Here, we proposed for the first time the idea of using a vacua or weak coherent states as decoy states. We also noted, for the first time, that decoy state QKD are unconditionally secure because of the GLLP (Gottesman, Lo, Lutkenhaus, Preskill) result