{
  "annotation_id": "5c3598fb-c24c-476b-9e0b-39ec6dfa3e59",
  "date_created": "2026-03-02T18:02:03.668000Z",
  "date_modified": "2026-03-02T18:02:03.668000Z",
  "file_hash": "0020f5f52af9d9503c7e9b29f15712e662d1012baad1f6b3721b7edf5154cc7c",
  "private": false,
  "record": {
    "abstract": "In this paper we establish a deep connection between the 3 qubit one-to-two\nphase-covariant quantum cloning network of Fuchs et al. [C. Fuchs, N. Gisin,\nR.B. Griffiths, C.S. Niu, and A. Peres, Phys. Rev. A 56 no 4, 1163 (1997)], and\nits economic 2 qubit counterpart due to Niu and Griffiths [Phys.Rev. A 60 no 4,\n2764 (1999)]. A general, necessary and sufficient criterion is derived in order\nto characterize the reducibility of 3 qubit cloners to 2 qubit cloners. When\nthis criterion is fulfilled, economic cloning is possible. We show that the\noptimal isotropic or universal 3 qubit cloning machine is not reducible to a 2\nqubit cloner.",
    "arxiv_id": "quant-ph/0309072",
    "authors": [
      "Thomas Durt",
      "Jiangfeng Du"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "About economic qubit cloning",
    "url": "https://arxiv.org/abs/quant-ph/0309072"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2df86a8e-4119-4be2-bcd7-78619a3e34ce",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}