{
  "annotation_id": "2eb96d90-b26a-4331-85a6-892b3fda0673",
  "date_created": "2026-03-02T18:02:20.541000Z",
  "date_modified": "2026-03-02T18:02:20.541000Z",
  "file_hash": "4c756cdb2c0a03524e5722d3586bc90aab8c878b3f10652354f6a177a562ff78",
  "private": false,
  "record": {
    "abstract": "We present an experimental method to measure the transverse spatial quantum\nstate of an optical field in coordinate space at the single-photon level. The\ncontinuous-variable measurements are made with a photon-counting,\nparity-inverting Sagnac interferometer based on all-reflecting optics. The\ntechnique provides a large numerical aperture without distorting the shape of\nthe wave front, does not introduce astigmatism, and allows for characterization\nof fully or partially coherent optical fields at the single-photon level.\nMeasurements of the transverse spatial Wigner functions for highly attenuated\ncoherent beams are presented and compared to theoretical predictions.",
    "arxiv_id": "quant-ph/0507142",
    "authors": [
      "Brian J. Smith",
      "Bryan Killett",
      "M. G. Raymer",
      "I. A. Walmsley",
      "K. Banaszek"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1364/OL.30.003365",
    "title": "Measurement of the transverse spatial quantum state of light at the   single-photon level",
    "url": "https://arxiv.org/abs/quant-ph/0507142"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1c8b5a2f-5e3b-4281-bb6e-0daf04046c61",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}