{
  "annotation_id": "66d3bcd3-e4a1-4f16-97fb-4876f0059073",
  "date_created": "2026-03-02T18:02:40.455000Z",
  "date_modified": "2026-03-02T18:02:40.455000Z",
  "file_hash": "670f5d97675ba997f53358468e09eebbb1c16bde1f16a91c85b9b71fa07880ff",
  "private": false,
  "record": {
    "abstract": "We present a network consisting of quantum gates which produces two imperfect\ncopies of an arbitrary qubit. The quality of the copies does not depend on the\ninput qubit. We also show that for a restricted class of inputs it is possible\nto use a very similar network to produce three copies instead of two. For\nqubits in this class, the copy quality is again independent of the input and is\nthe same as the quality of the copies produced by the two-copy network.",
    "arxiv_id": "quant-ph/9703046",
    "authors": [
      "V. Buzek",
      "S. L. Braunstein",
      "M. Hillery",
      "D. Bruss"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.56.3446",
    "title": "Quantum copying: A network",
    "url": "https://arxiv.org/abs/quant-ph/9703046"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "472ca613-5c00-4aaf-b8c1-aa826321c598",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}