{
  "annotation_id": "7074b4b4-9aaf-4b2f-86c6-c6f7d7bbf830",
  "date_created": "2026-03-02T18:01:42.587000Z",
  "date_modified": "2026-03-02T18:01:42.587000Z",
  "file_hash": "981f97d46bcebcb4ffb924a5c0c8b452bf7de3734bacce1de5c985ba4f8e7397",
  "private": false,
  "record": {
    "abstract": "We study the entanglement in the quantum Heisenberg XY model in which the\nso-called W entangled states can be generated for 3 or 4 qubits. By the concept\nof concurrence, we study the entanglement in the time evolution of the XY\nmodel. We investigate the thermal entanglement in the two-qubit isotropic XY\nmodel with a magnetic field and in the anisotropic XY model, and find that the\nthermal entanglement exists for both ferromagnetic and antiferromagnetic cases.\nSome evidences of the quantum phase transition also appear in these simple\nmodels.",
    "arxiv_id": "quant-ph/0101013",
    "authors": [
      "Xiaoguang Wang"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.stat-mech"
    ],
    "doi": "10.1103/PhysRevA.64.012313",
    "journal_ref": "Phys. Rev. A 64, 012313 (2001)",
    "title": "Entanglement in the Quantum Heisenberg XY model",
    "url": "https://arxiv.org/abs/quant-ph/0101013"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "757a3493-2c96-4445-ae26-bacb79daa7eb",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}