{
  "annotation_id": "22e6332d-62bf-4e74-a42a-d26bcf18a62f",
  "date_created": "2026-03-02T18:02:10.287000Z",
  "date_modified": "2026-03-02T18:02:10.287000Z",
  "file_hash": "ef8cd3a4bd327ae2d85971f041283717af06ee69d4ce9666d77c1d5dfe41b6dc",
  "private": false,
  "record": {
    "abstract": "We derive the optimal N to M phase-covariant quantum cloning for equatorial\nstates in dimension d with M=kd+N, k integer. The cloning maps are optimal for\nboth global and single-qudit fidelity. The map is achieved by an ``economical\u0027\u0027\ncloning machine, which works without ancilla.",
    "arxiv_id": "quant-ph/0407103",
    "authors": [
      "Francesco Buscemi",
      "Giacomo Mauro D\u0027Ariano",
      "Chiara Macchiavello"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.71.042327",
    "journal_ref": "Phys. Rev. A 71, 042327 (2005)",
    "title": "Economical Phase-Covariant Cloning of Qudits",
    "url": "https://arxiv.org/abs/quant-ph/0407103"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "63412dfc-2a36-4252-a46d-9f4050bdca75",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}