Continuous Variable Quantum Key Distribution: Finite-Key Analysis of Composable Security against Coherent Attacks
Abstract
We provide a security analysis for continuous variable quantum key distribution protocols based on the transmission of squeezed vacuum states measured via homodyne detection. We employ a version of the entropic uncertainty relation for smooth entropies to give a lower bound on the number of secret bits which can be extracted from a finite number of runs of the protocol. This bound is valid under general coherent attacks, and gives rise to keys which are composably secure. For comparison, we also give a lower bound valid under the assumption of collective attacks. For both scenarios, we find positive key rates using experimental parameters reachable today.
Cite
@article{arxiv.1112.2179,
title = {Continuous Variable Quantum Key Distribution: Finite-Key Analysis of Composable Security against Coherent Attacks},
author = {Fabian Furrer and Torsten Franz and Mario Berta and Anthony Leverrier and Volkher B. Scholz and Marco Tomamichel and Reinhard F. Werner},
journal= {arXiv preprint arXiv:1112.2179},
year = {2014}
}
Comments
v2: new author, technical inaccuracy corrected, new plots, v3: substantially improved key rates against coherent attacks (due to correction of an error in the numerical computation)