{
  "annotation_id": "138e6f61-c828-4992-b5cb-b73fde466788",
  "date_created": "2026-03-02T18:02:09.878000Z",
  "date_modified": "2026-03-02T18:02:09.878000Z",
  "file_hash": "ec67160a05509fb99ecc0b52a3bfbe8f040700a2d26d6330b065a0aca31dfe2f",
  "private": false,
  "record": {
    "abstract": "In ghost imaging schemes information about an object is extracted by\nmeasuring the correlation between a beam that passed the object and a reference\nbeam. We present a spatial averaging technique that substantially improves the\nimaging bandwidth of such schemes, which implies that information about\nhigh-frequency Fourier components can be observed in the reconstructed\ndiffraction pattern. In the many-photon regime the averaging can be done in\nparallel and we show that this leads to a much faster convergence of the\ncorrelations. We also consider the reconstruction of the object image, and\ndiscuss the differences between a pixel-like detector and a bucket detector in\nthe object arm. Finally, it is shown how to non-locally make spatial filtering\nof a reconstructed image. The results are presented using entangled beams\ncreated by parametric down-conversion, but they are general and can be extended\nalso to the important case of using classically correlated thermal-like beams.",
    "arxiv_id": "quant-ph/0409215",
    "authors": [
      "M. Bache",
      "E. Brambilla",
      "A. Gatti",
      "L. A. Lugiato"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1364/OPEX.12.006067",
    "journal_ref": "Opt. Express 12, 6067-6081 (2004),\n  http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-24-6067",
    "title": "Ghost imaging schemes: fast and broadband",
    "url": "https://arxiv.org/abs/quant-ph/0409215"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "a6acf9d0-d23a-449b-a306-fff6fa2f4ed4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}