{
  "annotation_id": "df43b617-c577-411f-9c40-90737cb1a7cf",
  "date_created": "2026-03-02T18:02:23.793000Z",
  "date_modified": "2026-03-02T18:02:23.793000Z",
  "file_hash": "a1ccd82fc6b59e433d53290a32a1f36ba91e1118b9081598f39b9e5a804030b9",
  "private": false,
  "record": {
    "abstract": "Quantum cloning of two identical mixed qubits $\\rho \\otimes \\rho $ is\nstudied. We propose the quantum cloning transformations not only for the\ntriplet (symmetric) states but also for the singlet (antisymmetric) state. We\ncan copy these two identical mixed qubits to M (M\u003e2) copies. This quantum\ncloning machine is optimal in the sense that the shrinking factor between the\ninput and the output single qubit achieves the upper bound. The result shows\nthat we can copy two identical mixed qubits with the same quality as that of\ntwo identical pure states.",
    "arxiv_id": "quant-ph/0601017",
    "authors": [
      "H. Fan",
      "B. Y. Liu",
      "K. J. Shi"
    ],
    "categories": [
      "quant-ph"
    ],
    "journal_ref": "Quantum Inf. Comput. 7, 551 (2007).",
    "title": "Quantum cloning of identical mixed qubits",
    "url": "https://arxiv.org/abs/quant-ph/0601017"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "330feef6-721e-4b75-9940-30d5728e70d1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}