{
  "abstract": "Characterizing entanglement in quantum materials through experimentally accessible observables remains a central challenge. Quantum Fisher information associated with sums of one-site spin operators provides one route by linking entanglement to measurable magnetic response functions. Extending this approach to local composite observables requires new entanglement bounds. Here we establish a rigorous bound for the total nearest-neighbour vector chirality of periodic spin-$1/2$ chains with an even number of sites. The quantum Fisher information per spin cannot exceed $k+1$ for any $k$-producible state, so exceeding this bound certifies entanglement depth of at least $k+1$. Combining infinite density-matrix renormalization group and thermal pure quantum-state calculations, we demonstrate multipartite entanglement encoded in vector-chiral correlations at zero and finite temperatures in an extended $J_1$-$J_2$ XXZ chain. The spin-current coupling between vector chirality and electric polarization offers, in principle, access to this witness through dielectric loss spectroscopy in multiferroic magnets, extending entanglement diagnostics beyond dipolar spin correlations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.39258",
  "author_total": 1,
  "authors": [
    {
      "name": "Tokuro Shimokawa"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0b60mmk135dnk.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.39258",
  "fulltext_url": null,
  "id": "0b60mmk135dnk",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.39258",
  "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",
      "cond-mat.str-el"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3107|Quantum many-body systems"
    ]
  ],
  "openalex": "W7215103182",
  "pdf_url": "https://arxiv.org/pdf/2609.39258",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0b60mmk135dnk.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:37Z",
      "native_id": "2609.39258",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.39258"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Multipartite entanglement hidden in vector-chiral correlations of spin-1/2 chains",
  "title_text": "Multipartite entanglement hidden in vector-chiral correlations of spin-1/2 chains",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:37Z",
  "url": "https://research.draconitic.com/paper/0b60mmk135dnk",
  "venue": "arXiv",
  "versions": []
}