{
  "annotation_id": "f04b0428-7479-4ca6-8e65-f477a0dbae29",
  "date_created": "2026-03-02T18:01:59.487000Z",
  "date_modified": "2026-03-02T18:01:59.487000Z",
  "file_hash": "a20efeaf1b8cbe96c93ca0ef53a6e56901d6a327d0593ec0a63ebd1bf3e8d852",
  "private": false,
  "record": {
    "abstract": "We study the far field spatial distribution of the quantum fluctuations in\nthe transverse profile of the output light beam generated by a type II Optical\nParametric Oscillator below threshold, including the effects of transverse\nwalk-off. We study how quadrature field correlations depend on the\npolarization. We find spatial EPR entanglement in quadrature-polarization\ncomponents: For the far field points not affected by walk-off there is almost\ncomplete noise suppression in the proper quadratures difference of any\northogonal polarization components. We show the entanglement of the state of\nsymmetric intense, or macroscopic, spatial light modes. We also investigate\nnonclassical polarization properties in terms of the Stokes operators. We find\nperfect correlations in all Stokes parameters measured in opposite far field\npoints in the direction orthogonal to the walk-off, while locally the field is\nunpolarized and we find no polarization squeezing.",
    "arxiv_id": "quant-ph/0306134",
    "authors": [
      "Roberta Zambrini",
      "Alessandra Gatti",
      "Luigi Lugiato",
      "Maxi San Miguel"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.68.063809",
    "title": "Polarization quantum properties in type-II Optical Parametric Oscillator   below threshold",
    "url": "https://arxiv.org/abs/quant-ph/0306134"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4d3081ec-980a-4513-9451-3145555e25a5",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}