{
  "annotation_id": "bc68364f-f183-49e3-bd51-cfe6959d50a8",
  "date_created": "2026-03-02T18:02:19.905000Z",
  "date_modified": "2026-03-02T18:02:19.905000Z",
  "file_hash": "6b7b939b123e7643ba5786e494ffb192bd8be4c272f9e436516c188d23a599de",
  "private": false,
  "record": {
    "abstract": "We study the transition of a quantum system $S $ from a pure state to a mixed\none, which is induced by the quantum criticality of the surrounding system $E$\ncoupled to it. To characterize this transition quantitatively, we carefully\nexamine the behavior of the Loschmidt echo (LE) of $E$ modelled as an Ising\nmodel in a transverse field, which behaves as a measuring apparatus in quantum\nmeasurement. It is found that the quantum critical behavior of $E$ strongly\naffects its capability of enhancing the decay of LE: near the critical value of\nthe transverse field entailing the happening of quantum phase transition, the\noff-diagonal elements of the reduced density matrix describing $S$ vanish\nsharply.",
    "arxiv_id": "quant-ph/0509007",
    "authors": [
      "H. T. Quan",
      "Z. Song",
      "X. F. Liu",
      "P. Zanardi",
      "C. P. Sun"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.str-el"
    ],
    "doi": "10.1103/PhysRevLett.96.140604",
    "journal_ref": "Phys. Rev. Lett. 96, 140604 (2006)",
    "title": "Decay of Loschmidt Echo Enhanced by Quantum Criticality",
    "url": "https://arxiv.org/abs/quant-ph/0509007"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "09bdfe77-d6db-41d7-844e-23f2f1e3e0c1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}