{
  "annotation_id": "b7c6edbd-6b91-45de-a206-3b51bdd4f10c",
  "date_created": "2026-03-02T18:02:33.970000Z",
  "date_modified": "2026-03-02T18:02:33.970000Z",
  "file_hash": "fd2605f7bc5128148d8c178ea6b3ebb07b66783053137cb4b07d8a77060a470c",
  "private": false,
  "record": {
    "abstract": "We demonstrate sub-shot-noise photon-number correlations in a (temporal)\nmultimode mesoscopic ($\\sim 10^3$ detected photons) twin-beam produced by\nps-pulsed spontaneous non-degenerate parametric downconversion. We have\nseparately detected the signal and idler distributions of photons collected in\ntwin coherence areas and found that the variance of the photon-count difference\ngoes below the shot-noise limit by 3.25 dB. The number of temporal modes\ncontained in the twin-beam, as well as the size of the twin coherence areas,\ndepends on the pump intensity. Our scheme is based on spontaneous\ndownconversion and thus does not suffer from limitations due to the finite gain\nof the parametric process. Twin-beams are also used to demonstrate the\nconditional preparation of a nonclassical (sub-Poissonian) state.",
    "arxiv_id": "quant-ph/0612198",
    "authors": [
      "Maria Bondani",
      "Alessia Allevi",
      "Guido Zambra",
      "Matteo G. A. Paris",
      "Alessandra Andreoni"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.76.013833",
    "journal_ref": "Phys. Rev. A 76, 013833 (2007)",
    "title": "Sub-shot-noise photon-number correlation in mesoscopic twin-beam of   light",
    "url": "https://arxiv.org/abs/quant-ph/0612198"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b61ff4f3-6ae5-44bf-8f9f-e7b75b1ecffe",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}