Effective discrete-modulated continuous variable QKD under general attacks using dimension reduction
Abstract
Continuous variable quantum key distribution via discrete modulations ensures information-theoretic security using standard telecom technologies, providing affordable and scalable quantum communications with simplified classical postprocessing. However, existing security proofs against general attacks often rely on restrictive assumptions, such as a bounded dimension for coherent states, or require impractically large block sizes. In this work, we develop a finite-size security analysis that removes these limitations while incorporating realistic experimental features. Our approach combines an optimization under infinite dimensions, a security proof against general attacks, a trusted detector model accounting for the receiver imperfections, and postselection strategies to reuse discarded measurement outcomes. We report positive key rates in the finite-size regime for relevant block sizes of the order of 107. These results contribute to narrowing the gap between theoretical security proofs and practical implementations of discrete-modulated continuous variable quantum key distribution protocols.
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BibTeX
@misc{navarro2026effective,
title = {{Effective discrete-modulated continuous variable QKD under general attacks using dimension reduction}},
author = {Mariana Navarro and Mateus Araújo and Antonio Acín and Carlos Pascual-García},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2606.20346},
eprint = {2606.20346},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.20346},
}
RIS
TY - UNPB
TI - Effective discrete-modulated continuous variable QKD under general attacks using dimension reduction
AU - Mariana Navarro
AU - Mateus Araújo
AU - Antonio Acín
AU - Carlos Pascual-García
PY - 2026
DA - 2026/09/09
PB - arXiv
DO - 10.48550/arxiv.2606.20346
UR - https://arxiv.org/abs/2606.20346
AB - Continuous variable quantum key distribution via discrete modulations ensures information-theoretic security using standard telecom technologies, providing affordable and scalable quantum communications with simplified classical postprocessing. However, existing security proofs against general attacks often rely on restrictive assumptions, such as a bounded dimension for coherent states, or require impractically large block sizes. In this work, we develop a finite-size security analysis that removes these limitations while incorporating realistic experimental features. Our approach combines an optimization under infinite dimensions, a security proof against general attacks, a trusted detector model accounting for the receiver imperfections, and postselection strategies to reuse discarded measurement outcomes. We report positive key rates in the finite-size regime for relevant block sizes of the order of 10^7. These results contribute to narrowing the gap between theoretical security proofs and practical implementations of discrete-modulated continuous variable quantum key distribution protocols.
ER -