{
  "annotation_id": "527b745e-539a-4ff4-ad04-57081e9a62ca",
  "date_created": "2026-03-02T18:01:38.613000Z",
  "date_modified": "2026-03-02T18:01:38.613000Z",
  "file_hash": "36d6b7c33d795decad0dac789fa47acf2de24eeb6bd8b6ae6c3a8da753baa40c",
  "private": false,
  "record": {
    "abstract": "While it is known that copying a quantum system does not increase the amount\nof information obtainable about the originals, it may increase the amount\navailable in practice, when one is restricted to imperfect measurements. We\npresent a detection scheme which using imperfect detectors, and possibly noisy\nquantum copying machines (that entangle the copies), allows one to extract more\ninformation from an incoming signal, than with the imperfect detectors alone.\nThe case of single-photon detection with noisy, inefficient detectors and\ncopiers (single controlled-NOT gates in this case) is investigated in detail.\nThe improvement in distinguishability between a photon and vacuum is found to\noccur for a wide range of parameters, and to be quite robust to random noise.\nThe properties that a quantum copying device must have to be useful in this\nscheme are investigated.",
    "arxiv_id": "quant-ph/0008032",
    "authors": [
      "P. Deuar",
      "W. J. Munro"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.62.042304",
    "journal_ref": "Phys. Rev A 61, 042304 (2000)",
    "title": "Quantum copying can increase the practically available information",
    "url": "https://arxiv.org/abs/quant-ph/0008032"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e06857b4-2068-4fef-8fae-80254ea063b2",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}