{
  "annotation_id": "8881dd65-6145-4040-b273-c9749d1ae10d",
  "date_created": "2026-03-02T18:02:02.802000Z",
  "date_modified": "2026-03-02T18:02:02.802000Z",
  "file_hash": "5fbc361b96052b803291bdb48b299f56333001b849cedaea1574b43539a44189",
  "private": false,
  "record": {
    "abstract": "Measurement of photon-number statistics of fields composed of photon pairs\ngenerated in spontaneous parametric downcoversion pumped by strong ultrashort\npulses is described. Final detection quantum efficiencies, noises as well as\npossible loss of one or both photons from a pair are taken into account.\nMeasured data provided by an intensified single-photon CCD camera are analyzed\nalong the developed model. The joint signal-idler photon-number distribution is\nobtained using the expectation maximization algorithm. Covariance of the signal\nand idler photon-numbers equals 80 %. Statistics of the generated photon pairs\nare identified to be Poissonian in our case. Distribution of the integrated\nintensities of the signal and idler fields shows strong correlations between\nthe fields. Negative values of this distribution occurring in some regions\nclearly demonstrate a nonclassical character of the light composed of photon\npairs.",
    "arxiv_id": "quant-ph/0310065",
    "authors": [
      "J. Perina Jr",
      "O. Haderka",
      "M. Hamar"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Statistical properties of twin beams generated in spontaneous parametric   downconversion",
    "url": "https://arxiv.org/abs/quant-ph/0310065"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1caa5d97-3e5f-488b-a9e6-70a090e86cd3",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}