{
  "annotation_id": "7c8f50d5-feb4-4cd9-9920-a786f5d33b9b",
  "date_created": "2026-03-02T18:02:03.647000Z",
  "date_modified": "2026-03-02T18:02:03.647000Z",
  "file_hash": "1356620f6070fdc713dd52e16a8e1012f24f26a59fa84466b7ec40d65e2565ed",
  "private": false,
  "record": {
    "abstract": "Motivated by the existence of bi-Hamiltonian classical systems and the\ncorrespondence principle, in this paper we analyze the problem of finding\n  Hermitian scalar products which turn a given flow on a Hilbert space into a\nunitary one. We show how different invariant Hermitian scalar products give\nrise to different descriptions of a quantum system in the Ehrenfest and\n  Heisenberg picture.",
    "arxiv_id": "quant-ph/0312033",
    "authors": [
      "G. Marmo",
      "A. Simoni",
      "F. Ventriglia"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1142/S0217751X04018385",
    "title": "Quantum Systems and Alternative Unitary Descriptions",
    "url": "https://arxiv.org/abs/quant-ph/0312033"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "500032d7-dc84-48dc-9915-84a23bfc810e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}