{
  "annotation_id": "686b373e-b044-4c43-a888-9d7e044c91e3",
  "date_created": "2026-03-02T18:02:09.889000Z",
  "date_modified": "2026-03-02T18:02:09.889000Z",
  "file_hash": "4d69e23700fd2775c90953c1c3ed8531d609bc33adca42e03dd7286566dc0c10",
  "private": false,
  "record": {
    "abstract": "Recently, a non-Gaussian field, which may be a useful basis for entanglement\ndistillation and efficient quantum teleportation, has been experimentally\nproduced by subtracting a photon from a squeezed Gaussian field. We investigate\nthe nonclassicality of such the field using negativity in the Wigner function\nand the existence of positive well-defined $P$ function. We obtain the\ncondition to see negativity in the Wigner function for the case including the\nmixed Gaussian incoming field, the threshold photodetection and the inefficient\nhomodyne measurement. We show how similar the photon-subtracted state is to a\nsuperposition of coherent states.",
    "arxiv_id": "quant-ph/0409218",
    "authors": [
      "M. S. Kim",
      "E. Park",
      "P. L. Knight",
      "H. Jeong"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.71.043805",
    "journal_ref": "Phys. Rev. A 71, 043805 (2005)",
    "title": "Nonclassicality of a photon-subtracted Gaussian field",
    "url": "https://arxiv.org/abs/quant-ph/0409218"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d7d1e72e-6cc0-4ac5-b4d7-294ebb7e96ff",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}