{
  "annotation_id": "9b713361-fa8a-4978-8640-f841b418052d",
  "date_created": "2026-03-02T18:02:02.670000Z",
  "date_modified": "2026-03-02T18:02:02.670000Z",
  "file_hash": "9205ba1e66f53786c1a0d738cf0395eb07edccc7ad339cb0f72ea1a69cfb2523",
  "private": false,
  "record": {
    "abstract": "We analyze the linear optical realization of number-sum Bell measurement and\nnumber-state manipulation by taking into account the realistic experimental\nsituation, specifically imperfectness of single-photon detector. The present\nscheme for number-state manipulation is based on the number-sum Bell\nmeasurement, which is implemented with linear optical elements, i.e., beam\nsplitters, phase shifters and zero-one-photon detectors. Squeezed vacuum states\nand coherent states are used as optical sources. The linear optical Bell state\ndetector is formulated quantum theoretically with a probability operator\nmeasure. Then, the fidelity of manipulation and preparation of number-states,\nparticularly for qubits and qutrits, is evaluated in terms of the quantum\nefficiency and dark count of single-photon detector. It is found that a high\nfidelity is achievable with small enough squeezing parameters and coherent\nstate amplitudes.",
    "arxiv_id": "quant-ph/0312171",
    "authors": [
      "Akira Kitagawa",
      "Katsuji Yamamoto"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.70.052311",
    "title": "Analysis for practical realization of number-state manipulation by   number-sum Bell measurement with linear optics",
    "url": "https://arxiv.org/abs/quant-ph/0312171"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "43957f9e-bf24-41ee-8d6e-e797add09c4b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}