Key rates for quantum key distribution protocols with asymmetric noise
Abstract
We consider the asymptotic key rates achieved in the simplest quantum key distribution protocols, namely the BB84 and the six-state protocols, when non-uniform noise is present in the system. We first observe that higher qubit error rates do not necessarily imply lower key rates. Secondly, we consider protocols with advantage distillation and show that it can be advantageous to use the basis with higher quantum bit error rate for the key generation. We then discuss the relation between advantage distillation and entanglement distillation protocols. We show that applying advantage distillation to a string of bits formed by the outcomes of measurements in the basis with higher quantum bit error rate is closely connected to the two-to-one entanglement distillation protocol DEJMPS. Finally, we discuss the implications of these results for implementations of quantum key distribution.
Cite
@article{arxiv.2002.07305,
title = {Key rates for quantum key distribution protocols with asymmetric noise},
author = {Gláucia Murta and Filip Rozpędek and Jérémy Ribeiro and David Elkouss and Stephanie Wehner},
journal= {arXiv preprint arXiv:2002.07305},
year = {2020}
}
Comments
11 pages, 7 figures. Typos corrected and references added. Close to the published version