{
  "annotation_id": "eef41e0c-06d4-429a-b77f-1fa937a97a7f",
  "date_created": "2026-03-02T18:02:38.002000Z",
  "date_modified": "2026-03-02T18:02:38.002000Z",
  "file_hash": "0f5834becc7cb896fdd5eb288288d292af165ddbd92cf6f59940173bd487ceef",
  "private": false,
  "record": {
    "abstract": "We propose an extended quantum mechanical formalism that is based on a wave\noperator $\\vr$, which is related to the ordinary density matrix via\n$\\rho=\\vr\\vr^\\dagger$. This formalism allows a (generalized) unitary evolution\nbetween pure and mixed states. It also preserves much of the connection between\nsymmetries and conservation laws. The new formalism is illustrated for the case\nof a two level system.",
    "arxiv_id": "quant-ph/9504019",
    "authors": [
      "B. Reznik"
    ],
    "categories": [
      "quant-ph",
      "gr-qc",
      "hep-th"
    ],
    "doi": "10.1103/PhysRevLett.76.1192",
    "journal_ref": "Phys.Rev.Lett. 76 (1996) 1192-1195",
    "title": "Unitary Evolution Between Pure and Mixed States",
    "url": "https://arxiv.org/abs/quant-ph/9504019"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "901c2dcc-a7ce-4edd-94bc-3729bdbe89d0",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}