{
  "annotation_id": "8a63cf87-f0c5-489c-9bfb-82d0acce27f9",
  "date_created": "2026-03-02T18:02:17.092000Z",
  "date_modified": "2026-03-02T18:02:17.092000Z",
  "file_hash": "b83ea60f87920500141cc156dbb7c42fd61a20b53a67dfee01774a2f077cd023",
  "private": false,
  "record": {
    "abstract": "We consider unitary evolution of finite bipartite quantum systems and study\ntime dependence of purity for initial cat states -- coherent superpositions of\nGaussian wave-packets. We derive explicit formula for purity in systems with\nnonzero time averaged coupling, a typical situation for systems where an\nuncoupled part of the Hamiltonian is Liouville integrable. Previous analytical\nstudies have been limited to harmonic oscillator systems but with our theory we\nare able to derive analytical results for general integrable systems. Two\nregimes are clearly identified, at short times purity decays due to decoherence\nwhereas at longer times it decays because of relaxation.",
    "arxiv_id": "quant-ph/0503200",
    "authors": [
      "Marko Znidaric",
      "Tomaz Prosen"
    ],
    "categories": [
      "quant-ph",
      "nlin.SI"
    ],
    "doi": "10.1088/1464-4266/7/9/012",
    "journal_ref": "J. Opt. B: Quantum Semiclass. Opt. 7, 306-311 (2005)",
    "title": "Decoherence in regular systems",
    "url": "https://arxiv.org/abs/quant-ph/0503200"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "283c6223-acbc-4691-a6b7-5d14558d72fe",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}