{
  "annotation_id": "c031815d-de12-47f0-8b1a-6444d1c59bae",
  "date_created": "2026-03-02T18:02:34.490000Z",
  "date_modified": "2026-03-02T18:02:34.490000Z",
  "file_hash": "2166a25e77649c4c6106565b9ce6051080df1ff6f7315daff80f201ede30c1c5",
  "private": false,
  "record": {
    "abstract": "We propose and demonstrate a method for measuring the spectral density matrix\nof a single photon pulse. The method is based on registering Hong-Ou-Mandel\ninterference between photon to be measured and a pair of attenuated and\nsuitably delayed laser pulses described by a known spectral amplitude. The\ndensity matrix is retrieved from a two-dimensional interferogram of coincidence\ncounts. The method has been implemented for a type-I downconversion source,\npumped by ultrashort laser pulses. The experimental results agree well with a\ntheoretical model which takes into account the temporal as well as spatial\neffects in the source.",
    "arxiv_id": "quant-ph/0702200",
    "authors": [
      "Wojciech Wasilewski",
      "Piotr Kolenderski",
      "Robert Frankowski"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.99.123601",
    "journal_ref": "Phys. Rev. Lett. 99, 123601 (2007)",
    "title": "Spectral density matrix of a single photon measured",
    "url": "https://arxiv.org/abs/quant-ph/0702200"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "59c8a5c1-483e-4eb9-98bd-73e6d659a3cf",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}