{
  "annotation_id": "b287ec62-7a61-416c-ad0e-d175c7956c3e",
  "date_created": "2026-03-02T18:02:31.205000Z",
  "date_modified": "2026-03-02T18:02:31.205000Z",
  "file_hash": "7e1786175c08a85577805b3a07be31ecaa0211d1993f8a573353776dc2619d51",
  "private": false,
  "record": {
    "abstract": "The efficiency of parameter estimation of quantum channels is studied in this\npaper. We introduce the concept of programmable parameters to the theory of\nestimation. It is found that programmable parameters obey the standard quantum\nlimit strictly; hence no speedup is possible in its estimation. We also\nconstruct a class of non-unitary quantum channels whose parameter can be\nestimated in a way that the standard quantum limit is broken. The study of\nestimation of general quantum channels also enables an investigation of the\neffect of noises on quantum estimation.",
    "arxiv_id": "quant-ph/0610060",
    "authors": [
      "Zhengfeng Ji",
      "Guoming Wang",
      "Runyao Duan",
      "Yuan Feng",
      "Mingsheng Ying"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1109/TIT.2008.929940",
    "journal_ref": "IEEE Trans. Inf. Theory, Vol. 54, No. 11, 5172-5185, 2008",
    "title": "Parameter estimation of quantum channels",
    "url": "https://arxiv.org/abs/quant-ph/0610060"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "43e44654-55bf-4d8b-8e10-720a8a3fffee",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}