{
  "abstract": "Future quantum communication networks will conceivably support cryptographic tasks that require entanglement among more than two users. Quantum secret sharing is a prime example where entanglement provides a direct means to coordinate untrusted parties with security from eavesdropping in a multi-party setting. However, the canonical GHZ-based protocols can be vulnerable to participant attacks, in which untrusted parties try to learn the secret without collaborating. Here, we experimentally evaluate a discrete-variable $(n,n)$-threshold quantum secret-sharing protocol whose finite-key analysis provides composable security against general attacks, including participant attacks. Using two domain-engineered entangled photon pair sources, we generate 4-qubit GHZ states at rates above $5\\times10^3$ fourfold events per second and a maximum asymptotic secret key rate of $750 \\pm 10$ bits per second. We then distribute the state through a 4-arm star network comprising 20km of fibre in total. From the measured event rates and error statistics, we infer that a randomised 24-hour execution with the optimised basis probability would yield a composable finite-key lower bound of 8.7 Mbits, under the assumption that the measured source and device statistics remain stationary.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.13367",
  "author_total": 8,
  "authors": [
    {
      "name": "Russell M. J. Brooks"
    },
    {
      "name": "Joseph Ho"
    },
    {
      "name": "Joseph Niblo"
    },
    {
      "name": "Janka Memmen"
    },
    {
      "name": "Anna Pappa"
    },
    {
      "name": "Jens Eisert"
    },
    {
      "name": "Nathan Walk"
    },
    {
      "name": "Alessandro Fedrizzi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9wbpqfr6jvj4v.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.13367",
  "fulltext_url": null,
  "id": "9wbpqfr6jvj4v",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.13367",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7213231229",
  "pdf_url": "https://arxiv.org/pdf/2609.13367",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-11",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9wbpqfr6jvj4v.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.13367",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.13367"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "High-rate multipartite quantum secret sharing with composable security",
  "title_text": "High-rate multipartite quantum secret sharing with composable security",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/9wbpqfr6jvj4v",
  "venue": "arXiv",
  "versions": []
}