PreprintarXiv licencearXiv
Experimental demonstration of finite-size general security via discrete-modulated CVQKD with real time postprocessing
Abstract
Continuous-variable quantum key distribution (CVQKD) is compatible with telecommunication infrastructure, but implementing composable security with experimentally practical resources has remained challenging, particularly for discrete-modulated (DM) protocols. We report the first experimental demonstration of a DM CVQKD system that generates composable secret keys against general attacks with finite-size block lengths on the order of ∼ 106 rounds via a quadrature phase shift keying (QPSK) system. Our implementation follows a variable-length, general security framework enabled by modern entropy accumulation techniques and conic optimization, whose experimental pipeline allows real-time operation on near-commercial hardware.
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BibTeX
@misc{bodenstedt2026experimental,
title = {{Experimental demonstration of finite-size general security via discrete-modulated CVQKD with real time postprocessing}},
author = {Sven Bodenstedt and Carlos Pascual-García and Nil Canta i Pujol and Martí Sales-Moragues and Mariana Navarro and Pau Gómez Kabelka and Sebastián Etcheverry and Saeed Ghasemi},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.20596},
eprint = {2609.20596},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.20596},
}
RIS
TY - UNPB
TI - Experimental demonstration of finite-size general security via discrete-modulated CVQKD with real time postprocessing
AU - Sven Bodenstedt
AU - Carlos Pascual-García
AU - Nil Canta i Pujol
AU - Martí Sales-Moragues
AU - Mariana Navarro
AU - Pau Gómez Kabelka
AU - Sebastián Etcheverry
AU - Saeed Ghasemi
PY - 2026
DA - 2026/09/17
PB - arXiv
DO - 10.48550/arxiv.2609.20596
UR - https://arxiv.org/abs/2609.20596
AB - Continuous-variable quantum key distribution (CVQKD) is compatible with telecommunication infrastructure, but implementing composable security with experimentally practical resources has remained challenging, particularly for discrete-modulated (DM) protocols. We report the first experimental demonstration of a DM CVQKD system that generates composable secret keys against general attacks with finite-size block lengths on the order of ∼ 10^6 rounds via a quadrature phase shift keying (QPSK) system. Our implementation follows a variable-length, general security framework enabled by modern entropy accumulation techniques and conic optimization, whose experimental pipeline allows real-time operation on near-commercial hardware.
ER -