{
  "annotation_id": "e3e16af4-7a5b-4db1-b19d-f0dc32259bd9",
  "date_created": "2026-03-02T18:01:49.267000Z",
  "date_modified": "2026-03-02T18:01:49.267000Z",
  "file_hash": "1659157fa5d77941416d526c8bed586ae7520750da343f659e490ba195983031",
  "private": false,
  "record": {
    "abstract": "Optical quantum nondemolition devices can provide essential tools for quantum\ninformation processing. Here, we describe several optical interferometers that\nsignal the presence of a single photon in a particular input state without\ndestroying it. We discuss both entanglement-assisted and\nnon-entanglement-assisted interferometers, with ideal and realistic detectors.\nWe found that existing detectors with 88% quantum efficiency and single-photon\nresolution can yield output fidelities of up to 89%, depending on the input\nstate. Furthermore, we construct expanded protocols to perform QND detections\nof single photons that leave the polarization invariant. For detectors with 88%\nefficiency we found polarization-preserving output fidelities of up to 98.5%.",
    "arxiv_id": "quant-ph/0202046",
    "authors": [
      "Pieter Kok",
      "Hwang Lee",
      "Jonathan P. Dowling"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.66.063814",
    "journal_ref": "Phys. Rev. A, Vol. 66, 063814 (2002)",
    "title": "Single-photon quantum nondemolition detectors constructed with linear   optics and projective measurements",
    "url": "https://arxiv.org/abs/quant-ph/0202046"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2ed437fb-f974-4c90-ba38-aaeed7867823",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}