{
  "annotation_id": "1b444fa2-77c2-4257-a62c-dac9726f92f5",
  "date_created": "2026-03-02T18:01:56.067000Z",
  "date_modified": "2026-03-02T18:01:56.067000Z",
  "file_hash": "8eed0ecae1fe954649b0e136cac36ec3ced7b7c95103e1b52e39b4c3d07ad86c",
  "private": false,
  "record": {
    "abstract": "We investigate a new class of quantum cloning machines that equally duplicate\nall real states in a Hilbert space of arbitrary dimension. By using the\nno-signaling condition, namely that cloning cannot make superluminal\ncommunication possible, we derive an upper bound on the fidelity of this class\nof quantum cloning machines. Then, for each dimension d, we construct an\noptimal symmetric cloner whose fidelity saturates this bound. Similar\ncalculations can also be performed in order to recover the fidelity of the\noptimal universal cloner in d dimensions.",
    "arxiv_id": "quant-ph/0302172",
    "authors": [
      "Patrick Navez",
      "Nicolas J. Cerf"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.68.032313",
    "journal_ref": "Phys. Rev. A 68, 032313 (2003).",
    "title": "Cloning a real d-dimensional quantum state on the edge of the   no-signaling condition",
    "url": "https://arxiv.org/abs/quant-ph/0302172"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e96e3438-b19b-49bb-aeea-d9f38736503d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}