{
  "annotation_id": "99a7ee4a-f32d-43e2-8d4f-189a617091eb",
  "date_created": "2026-03-02T18:02:34.613000Z",
  "date_modified": "2026-03-02T18:02:34.613000Z",
  "file_hash": "f653318c8f25fd2e9cc2ceed9c33b90872c4b51f767db51e44567af173ba2762",
  "private": false,
  "record": {
    "abstract": "We explore a dynamic signature of quantum phase transition (QPT) in an\nisotropic Lipkin-Meshkov-Glick (LMG) model by studying the time evolution of a\ncentral qubit coupled to it. We evaluate exactly the time-dependent purity,\nwhich can be used to measure quantum coherence, of the central qubit. It is\nfound that distinctly different behaviors of the purity as a function of the\nparameter reveal clearly the QPT point in the system. It is also clarified that\nthe present model is equivalent to an anti Jaynes-Cummings model under certain\nconditions.",
    "arxiv_id": "quant-ph/0702268",
    "authors": [
      "H. T. Quan",
      "Z. D. Wang",
      "C. P. Sun"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.76.012104",
    "journal_ref": "Phys. Rev. A 76, 012104 (2007)",
    "title": "Quantum Critical Dynamics of A Qubit Coupled to An Isotropic   Lipkin-Meshkov-Glick Bath",
    "url": "https://arxiv.org/abs/quant-ph/0702268"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "6adb411a-a575-4972-b639-9a7715730276",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}