{
  "annotation_id": "39e4353f-e0a7-4601-adcc-a3ac4acf6a26",
  "date_created": "2026-03-02T18:01:45.772000Z",
  "date_modified": "2026-03-02T18:01:45.772000Z",
  "file_hash": "1262d3412c690428e5fc911e85283bf88d52e80f7497efd298240b53445321ce",
  "private": false,
  "record": {
    "abstract": "We demonstrate, theoretically and experimentally, that statistical mixtures\nof the vacuum state |0\u003e and the single-photon Fock state |1\u003e are nonclassical\naccording to the Vogel criterion (W. Vogel, Phys. Rev. Lett. 84, 1849 (2000)),\nregardless of the vacuum fraction. The ensembles are synthesized via\nconditional measurements on biphotons generated by means of parametric\ndownconversion, and their quadrature statistics are measured using balanced\nhomodyne detection. A comparative review of various quantum state\nnonclassicality criteria is presented.",
    "arxiv_id": "quant-ph/0109057",
    "authors": [
      "A. I. Lvovsky",
      "J. H. Shapiro"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.65.033830",
    "journal_ref": "Physical Review A 65, 033830 (2002)",
    "title": "Nonclassical character of statistical mixtures of the single-photon and   vacuum optical states",
    "url": "https://arxiv.org/abs/quant-ph/0109057"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f6cef7a3-fb88-4095-bc1d-2e340f2651f8",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}