{
  "annotation_id": "d071b1e5-93dd-4804-92d8-4ad8991b3503",
  "date_created": "2026-03-02T18:02:45.194000Z",
  "date_modified": "2026-03-02T18:02:45.194000Z",
  "file_hash": "092d75b10433dfd3e58e81ae1502e9eb02113c0c6224098af339d32981028f3d",
  "private": false,
  "record": {
    "abstract": "We generalize the concepts of Internal Time Superoperator, its associated non\nunitary similarity transformations and Liapounov variables, to quantum systems\nwith diagonal singularity, and we give a constructive proof of the existence of\nthese superoperators for systems with purely diagonal Hamiltonian having\nuniform absolutely continuous spectrum on the interval from zero to infinity.",
    "arxiv_id": "quant-ph/9903090",
    "authors": [
      "Roberto Laura",
      "Adolfo R. Ordoniez"
    ],
    "categories": [
      "quant-ph"
    ],
    "journal_ref": "Int. Jour. Theor. Phys., Vol. 36, No. 11, 1997",
    "title": "Internal Time Superoperator for Quantum Systems with Diagonal   Singularity",
    "url": "https://arxiv.org/abs/quant-ph/9903090"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "589e7375-8d69-48a8-85f6-3726e0f96b55",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}