{
  "annotation_id": "72e05172-d3ba-40fc-ab79-3f618f501d77",
  "date_created": "2026-03-02T18:02:33.508000Z",
  "date_modified": "2026-03-02T18:02:33.508000Z",
  "file_hash": "fb3fe42c5c8d85e2447e0c3a7783fbc3f4db696859f0d4bf991e361a0e1a5b6d",
  "private": false,
  "record": {
    "abstract": "While exact cloning of an unknown quantum state is prohibited by the\nlinearity of quantum mechanics, approximate cloning is possible and has been\nused, e.g., to derive limits on the security of quantum communication\nprotocols. In the case of asymmetric cloning, the information from the input\nstate is distributed asymmetrically between the different output states. Here,\nwe consider asymmetric phase-covariant cloning, where the goal is to optimally\ntransfer the phase information from a single input qubit to different output\nqubits. We construct an optimal quantum cloning machine for two qubits that\ndoes not require ancilla qubits and implement it on an NMR quantum information\nprocessor.",
    "arxiv_id": "quant-ph/0612132",
    "authors": [
      "Hongwei Chen",
      "Xianyi Zhou",
      "Dieter Suter",
      "Jiangfeng Du"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.75.012317",
    "title": "Experimental Realization of $1 \\to 2$ Asymmetric Phase-Covariant Quantum   Cloning",
    "url": "https://arxiv.org/abs/quant-ph/0612132"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "e33590d8-c243-4e2a-8d55-0c8ddb4ee837",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}