{
  "annotation_id": "f6901862-b578-49e7-af77-4394037920d6",
  "date_created": "2026-03-02T18:02:30.795000Z",
  "date_modified": "2026-03-02T18:02:30.795000Z",
  "file_hash": "8334c7b9230cc8842e38b1f24a274b1ce45d6e6424aa5fa354fa9bbf0d9bbb78",
  "private": false,
  "record": {
    "abstract": "We consider the problem of broadcasting quantum information encoded in the\ndisplacement parameter for an harmonic oscillator, from N to M\u003eN copies of a\nthermal state. We show the Weyl-Heisenberg covariant broadcasting map that\noptimally reduces the thermal photon number, and we prove that it minimizes the\nnoise in conjugate quadratures at the output for general input states. We find\nthat from two input copies broadcasting is feasible, with the possibility of\nsimultaneous purification (superbroadcasting).",
    "arxiv_id": "quant-ph/0609046",
    "authors": [
      "G. M. D\u0027Ariano",
      "P. Perinotti",
      "M. F. Sacchi"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1134/S0030400X07070259",
    "journal_ref": "Optics and Spectroscopy 103, 170 (2007)",
    "title": "Superbroadcasting of harmonic oscillators mixed states",
    "url": "https://arxiv.org/abs/quant-ph/0609046"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ec9097c7-3ccb-465d-9412-cf9b16bbe869",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}