{
  "annotation_id": "ca82d1db-a4d2-46cd-ac43-312d7992134c",
  "date_created": "2026-03-02T18:02:00.258000Z",
  "date_modified": "2026-03-02T18:02:00.258000Z",
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  "private": false,
  "record": {
    "abstract": "Quantum cloning machine for arbitrary mixed states in symmetric subspace is\nproposed. This quantum cloning machine can be used to copy part of the output\nstate of another quantum cloning machine and is useful in quantum computation\nand quantum information. The shrinking factor of this quantum cloning achieves\nthe well-known upper bound. When the input is identical pure states, two\ndifferent fidelities of this cloning machine are optimal.",
    "arxiv_id": "quant-ph/0308058",
    "authors": [
      "Heng Fan"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.68.054301",
    "journal_ref": "Phys.Rev.A 68, 054301 (2003).",
    "title": "Quantum Cloning of Mixed States in Symmetric Subspace",
    "url": "https://arxiv.org/abs/quant-ph/0308058"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "a3eeaf1b-f5e2-4844-98d8-2a469cc40849",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}