{
  "annotation_id": "71d27e13-6dc6-45de-86fa-8fd0cddd08c8",
  "date_created": "2026-03-02T18:02:10.185000Z",
  "date_modified": "2026-03-02T18:02:10.185000Z",
  "file_hash": "92991b01f444a30c72b424139fcab800e31024a7374fadb1b0464f62e182cc76",
  "private": false,
  "record": {
    "abstract": "We consider the problem of the validity of a statistical mechanical\ndescription of two-site entanglement in an infinite spin chain described by the\nXY model Hamiltonian. We show that the two-site entanglement of the state,\nevolved from the initial equilibrium state, after a change of the magnetic\nfield, does not approach its equilibrium value. This suggests that two-site\nentanglement, like (single-site) magnetization, is a nonergodic quantity in\nthis model. Moreover we show that these two nonergodic quantities behave in a\ncomplementary way.",
    "arxiv_id": "quant-ph/0407114",
    "authors": [
      "Aditi Sen De",
      "Ujjwal Sen",
      "Maciej Lewenstein"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.stat-mech"
    ],
    "doi": "10.1103/PhysRevA.70.060304",
    "journal_ref": "Phys. Rev. A (Rapid Comm.) 70, 060304 (2004)",
    "title": "Nonergodicity of entanglement and its complementary behavior to   magnetization in infinite spin chain",
    "url": "https://arxiv.org/abs/quant-ph/0407114"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3d7747d3-f026-4152-a5dd-b787e0e3294d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}