{
  "abstract": "Certifying Bell correlations in increasingly larger multipartite quantum systems is challenging because conventional Bell inequalities rely on many-body correlations, which become experimentally demanding to estimate as system size grows. Here we demonstrate that multipartite Bell correlations can be certified using few-body permutation-invariant (PI) correlations with a fixed maximal correlation order. We experimentally test few-body PI Bell correlation witnesses tailored for six- and eight-photon postselected Dicke states. The addition of a few four-body correlators is found to significantly enhance the noise tolerance compared with previously studied two-body witnesses: for instance, for six qubits, the selected witness tolerates a white-noise fraction of $p_c\\approx0.301$, compared with $p_c\\approx0.048$ for the best two-body PI inequality with the same two settings per party. For six and eight photons respectively, we observe violations of the witness bounds by $32$ and $8.9$ standard deviations, arising from postselected polarisation states with fidelities of $0.933(4)$ and $0.916(11)$ to the corresponding half-excitation Dicke states. The witnesses for the six- and eight-photon cases use the same symmetric two- and four-body correlators, just with different coefficients. These results demonstrate an experimentally accessible approach for certifying multipartite Bell correlations in larger systems without requiring full-body correlation measurements.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.37442",
  "author_total": 12,
  "authors": [
    {
      "name": "Jiacheng Sun"
    },
    {
      "name": "Mengyao Hu"
    },
    {
      "name": "Paweł Cieśliński"
    },
    {
      "name": "Jinfu Chen"
    },
    {
      "name": "Fei Shi"
    },
    {
      "name": "Bowen Wang"
    },
    {
      "name": "Hongyu Yang"
    },
    {
      "name": "Jizhou Wu"
    },
    {
      "name": "Jordi Tura"
    },
    {
      "name": "Valerio Scarani"
    },
    {
      "name": "Dian Wu"
    },
    {
      "name": "Jian Wu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/38z9m4jqskd5y.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.37442",
  "fulltext_url": null,
  "id": "38z9m4jqskd5y",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.37442",
  "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": "W7214917027",
  "pdf_url": "https://arxiv.org/pdf/2609.37442",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/38z9m4jqskd5y.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.37442",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.37442"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Experimental certification of multipartite Bell correlations using only few-body symmetric correlations",
  "title_text": "Experimental certification of multipartite Bell correlations using only few-body symmetric correlations",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/38z9m4jqskd5y",
  "venue": "arXiv",
  "versions": []
}