{
  "annotation_id": "94cd6c8d-23d9-435d-861e-c4f8355a089c",
  "date_created": "2026-03-02T18:02:20.650000Z",
  "date_modified": "2026-03-02T18:02:20.650000Z",
  "file_hash": "8283d85aaa013610289b070565a2a2f8ff62696dc55e040e088aeebb9e134fb6",
  "private": false,
  "record": {
    "abstract": "We examine two exactly solvable models of decoherence -- a central\nspin-system, (i) with and (ii) without a self--Hamiltonian, interacting with a\ncollection of environment spins. In the absence of a self--Hamiltonian we show\nthat in this model (introduced some time ago to illustrate environment--induced\nsuperselection) generic assumptions about the coupling strengths can lead to a\nuniversal (Gaussian) suppression of coherence between pointer states. On the\nother hand, we show that when the dynamics of the central spin is dominant a\ndifferent regime emerges, which is characterized by a non--Gaussian decay and a\ndramatically different set of pointer states. We explore the regimes of\nvalidity of the Gaussian--decay and discuss its relation to the spectral\nfeatures of the environment and to the Loschmidt echo (or fidelity).",
    "arxiv_id": "quant-ph/0508184",
    "authors": [
      "F. M. Cucchietti",
      "J. P. Paz",
      "W. H. Zurek"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.72.052113",
    "journal_ref": "Phys. Rev. A 72, 052113 (2005)",
    "title": "Decoherence from spin environments",
    "url": "https://arxiv.org/abs/quant-ph/0508184"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f2ac60ff-379f-4ef1-bd78-c9dd0867d98c",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}