{
  "annotation_id": "4a605d14-1662-4cb1-b114-2c367492ef2b",
  "date_created": "2026-03-02T18:02:02.263000Z",
  "date_modified": "2026-03-02T18:02:02.263000Z",
  "file_hash": "c766600a3d05d7ce75ba761e26d0d4bf95be0a221e0b425077a7f3b240fe89e0",
  "private": false,
  "record": {
    "abstract": "Recently Galv\\~{a}o and Hardy have shown that quantum cloning can improve the\nperformance of some quantum computation tasks. However such performance\nenhancement is possible only if quantum correlations survive the cloning\nprocess. We investigate preservation of the quantum correlations in the process\nof non--local cloning of entangled pairs of two--level systems. We consider\ndifferent kinds of quantum cloning machines and compare their effectiveness in\nthe cloning of non--maximally entangled pure states. A mean entanglement is\nintroduced in order to obtain a quantitative evaluation of an average\nefficiency for the different cloning machines. We show that a reduction of the\nquantum correlations is significant and it strongly depends upon the kind of\ncloning machine used. Losses of the entanglement are largest in the case of the\nuniversal quantum cloning machine. Generally, in all cases considered the\nlosses of the entanglement are so drastic that the method of enhancement for\nthe performance of the quantum computation using the quantum cloning seems to\nbe questionable.",
    "arxiv_id": "quant-ph/0309019",
    "authors": [
      "Pawe\u0142 Masiak"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1080/0950034031000095605",
    "journal_ref": "Journal of Modern Optics, vol. 50, no. 12, 1873-1881 (2003)",
    "title": "Entanglement preservation in quantum cloning",
    "url": "https://arxiv.org/abs/quant-ph/0309019"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0769b6ee-5abd-4f76-8a6f-9391a8c19371",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}