{
  "annotation_id": "71f4f38f-97cc-4047-9b55-9c85ea6be430",
  "date_created": "2026-03-02T18:02:12.630000Z",
  "date_modified": "2026-03-02T18:02:12.630000Z",
  "file_hash": "385e092d0fdc9d6d5da20b394c5a5e3b260b90372309eb73b3ecd6c654449a46",
  "private": false,
  "record": {
    "abstract": "Systems of exchange-coupled spins are commonly used to model ferromagnets.\nThe quantum correlations in such magnets are studied using tools from quantum\ninformation theory. Isotropic ferromagnets are shown to possess a universal\nlow-temperature density matrix which precludes entanglement between spins, and\nthe mechanism of entanglement cancellation is investigated, revealing a core of\nstates resistant to pairwise entanglement cancellation. Numerical studies of\none-, two-, and three-dimensional lattices as well as irregular geometries\nshowed no entanglement in ferromagnets at any temperature or magnetic field\nstrength.",
    "arxiv_id": "quant-ph/0411125",
    "authors": [
      "J. S. Pratt"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.93.237205",
    "journal_ref": "Phys. Rev. Lett. 93, 237205 (2004)",
    "title": "Universality in the entanglement structure of ferromagnets",
    "url": "https://arxiv.org/abs/quant-ph/0411125"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8f67527f-e86a-4f01-8e47-c450070d4bf4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}