{
  "annotation_id": "ccdb9741-c661-4bfd-a516-25d315363baa",
  "date_created": "2026-03-02T18:02:34.663000Z",
  "date_modified": "2026-03-02T18:02:34.663000Z",
  "file_hash": "12571de0312ac36a450a88a4bb3c9161335ecce0b9915c8544a7b9fa5d2787f6",
  "private": false,
  "record": {
    "abstract": "The LH-II of purple bacteria Rhodospirillum (Rs.) molischianum and\nRhodopseudomonas (Rps.) acidophila adopts a highly symmetrical ring shape, with\na radius of about 7 nm. In the case of Rps. acidophila the ring has a ninefold\nsymmetry axis, and in LH-II from Rs. molischianum the ring has an eightfold\nsymmetry axis. These rings are found to exibit two bands of excitons. A\nsimplified mathematical description of the exciton states is given in Hu, X. \u0026\nSchulten, K. (1997) Physics Today 50, 28-34. Using this description, we will\nshow, by suitable labeling of the lowest energy (Qy) excited states of\nindividual BChls, that the resulting exciton states are the quantum Fourier\ntransform of the BChls excited states. For Rs. molischianum ring exciton states\nwill be modeled as the four qubit quantum Fourier transform and the explicit\ncircuit will be derived. Exciton states for Rps. acidophila ring cannot be\nmodeled with an integer number of qubits. Both quantum Fourier transforms are\ninstances of the hidden subgroup problem and this opens up a possibility that\nboth purple bacteria implement an efficient quantum circuit for light\nharvesting.",
    "arxiv_id": "quant-ph/0702203",
    "authors": [
      "Samir Lipovaca"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Purple bacteria and quantum Fourier transform",
    "url": "https://arxiv.org/abs/quant-ph/0702203"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d115ca74-348c-49ed-9cca-011282a028f8",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}