{
  "annotation_id": "2be18350-d9fc-4933-bc15-02f09132a67c",
  "date_created": "2026-03-02T18:02:06.452000Z",
  "date_modified": "2026-03-02T18:02:06.452000Z",
  "file_hash": "d6d94fbebea5eda78d178ab43322319837cefa7e589a426cdca24ac2bdf648f6",
  "private": false,
  "record": {
    "abstract": "Triggered single-photon sources produce the vacuum state with non-negligible\nprobability, but produce a much smaller multiphoton component. It is therefore\nreasonable to approximate the output of these photon sources as a mixture of\nthe vacuum and single-photon states. We show that it is impossible to increase\nthe probability for a single photon using linear optics and photodetection on\nfewer than four modes. This impossibility is due to the incoherence of the\ninputs; if the inputs were pure-state superpositions, it would be possible to\nobtain a perfect single-photon output. In the more general case, a chain of\nbeam splitters can be used to increase the probability for a single photon, but\nat the expense of adding an additional multiphoton component. This improvement\nis robust against detector inefficiencies, but is degraded by dark counts or\nmultiphoton components in the input.",
    "arxiv_id": "quant-ph/0402018",
    "authors": [
      "Dominic W. Berry",
      "Stefan Scheel",
      "Casey R. Myers",
      "Barry C. Sanders",
      "Peter L. Knight",
      "Raymond Laflamme"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/1367-2630/6/1/093",
    "journal_ref": "New J. Phys. 6, 93 (2004)",
    "title": "Post-processing with linear optics for improving the quality of   single-photon sources",
    "url": "https://arxiv.org/abs/quant-ph/0402018"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3605a7fc-01f3-4531-a168-922c24be0ed3",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}