{
  "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 $\\sim 10^{6}$ 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.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.20596",
  "author_total": 8,
  "authors": [
    {
      "name": "Sven Bodenstedt"
    },
    {
      "name": "Carlos Pascual-García"
    },
    {
      "name": "Nil Canta i Pujol"
    },
    {
      "name": "Martí Sales-Moragues"
    },
    {
      "name": "Mariana Navarro"
    },
    {
      "name": "Pau Gómez Kabelka"
    },
    {
      "name": "Sebastián Etcheverry"
    },
    {
      "name": "Saeed Ghasemi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/d6q1z23j120wd.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.20596",
  "fulltext_url": null,
  "id": "d6q1z23j120wd",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.20596",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7213603840",
  "pdf_url": "https://arxiv.org/pdf/2609.20596",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/d6q1z23j120wd.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2609.20596",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.20596"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Experimental demonstration of finite-size general security via discrete-modulated CVQKD with real time postprocessing",
  "title_text": "Experimental demonstration of finite-size general security via discrete-modulated CVQKD with real time postprocessing",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/d6q1z23j120wd",
  "venue": "arXiv",
  "versions": []
}