Compared with two-level quantum key distribution (QKD), highdimensional QKD enable two distant parties to share a secret key at a higher rate. We provide a finite-key security analysis for the recently proposed practical highdimensional decoy-state QKD protocol based on time-energy entanglement. We employ two methods to estimate the statistical fluctuation of the postselection probability and give a tighter bound on the secure-key capacity. By numerical evaluation, we show the finite-key effect on the secure-key capacity in different conditions. Moreover, our approach could be used to optimize parameters in practical implementations of highdimensional QKD.
@article{arxiv.1605.04536,
title = {Finite-key analysis of a practical decoy-state high-dimensional quantum key distribution},
author = {Haize Bao and Wansu Bao and Yang Wang and Chun Zhou and Ruike Chen},
journal= {arXiv preprint arXiv:1605.04536},
year = {2016}
}