{
  "annotation_id": "60e22a6a-a229-4c2b-a680-5a3bca971671",
  "date_created": "2026-03-02T18:02:48.005000Z",
  "date_modified": "2026-03-02T18:02:48.005000Z",
  "file_hash": "1753f09971ae28f5620f71ede62a59061db5a7472592d947f3f45a4b8ca63d90",
  "private": false,
  "record": {
    "abstract": "We show that the condition of no faster-than-light signalling restricts the\nnumber of quantum states that can be cloned in a given Hilbert space. This\ncondition leads to the constraints on a probabilistic quantum cloning machine\n(PQCM) recently found by Duan and Guo.",
    "arxiv_id": "quant-ph/9905024",
    "authors": [
      "Lucien Hardy",
      "David D. Song"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1016/S0375-9601(99)00448-X",
    "journal_ref": "Phys.Lett. A259 (1999) 331-333",
    "title": "No Signalling and Probabilistic Quantum Cloning",
    "url": "https://arxiv.org/abs/quant-ph/9905024"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f0764312-c508-4f83-9c0f-c05769f0fd4d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}