{
  "annotation_id": "31f53489-9d8e-4734-8084-9d7ecfee59c1",
  "date_created": "2026-03-02T18:02:16.527000Z",
  "date_modified": "2026-03-02T18:02:16.527000Z",
  "file_hash": "fb3d01fa44757628ebac8c7959abd900ae3630c6c358dfe5632342cf62cd1e63",
  "private": false,
  "record": {
    "abstract": "We calculate the atomic (spin) Wigner function for the single mode Dicke\nmodel in the regime of large number of two-level atoms. The dynamics of this\nquasi-probability function on the Bloch sphere allows us to visualize the\nconsequences of the entanglement process between the boson and the spin\nsubsystems. Such investigation shows a distinct localization behavior of the\nspin state with respect to the polar and azimuthal Bloch sphere angles. A\ncomplete {\\em breakdown of reflection symmetry} in the azimuthal angle is shown\nin the non-integrable case, even at short evolution times. Also, in the\nclassically chaotic situation, the appearance of {\\em sub-planck structures} in\nthe Wigner function is shown, and its evolution analyzed.",
    "arxiv_id": "quant-ph/0507025",
    "authors": [
      "L. Sanz",
      "K. Furuya"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Entanglement, chaos and atomic Wigner function of the Dicke model",
    "url": "https://arxiv.org/abs/quant-ph/0507025"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "38b77968-948a-4fb5-bd63-f69b12d00f72",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}