{
  "annotation_id": "aa2c4954-4e41-40f7-a436-531f8bdafb62",
  "date_created": "2026-03-02T18:02:44.471000Z",
  "date_modified": "2026-03-02T18:02:44.471000Z",
  "file_hash": "1dce353398b9dfcf83f595b545aa3f71709da40b7126822f30fcf299d2203231",
  "private": false,
  "record": {
    "abstract": "We present a formulation of feedback in quantum systems in which the best\nestimates of the dynamical variables are obtained continuously from the\nmeasurement record, and fed back to control the system. We apply this method to\nthe problem of cooling and confining a single quantum degree of freedom, and\ncompare it to current schemes in which the measurement signal is fed back\ndirectly in the manner usually considered in existing treatments of quantum\nfeedback. Direct feedback may be combined with feedback by estimation, and the\nresulting combination, performed on a linear system, is closely analogous to\nclassical LQG control theory with residual feedback.",
    "arxiv_id": "quant-ph/9812004",
    "authors": [
      "A. C. Doherty",
      "K. Jacobs"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.60.2700",
    "journal_ref": "Phys.Rev. A60 (1999) 2700",
    "title": "Feedback-control of quantum systems using continuous state-estimation",
    "url": "https://arxiv.org/abs/quant-ph/9812004"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "dfaa272d-1b38-4a5e-9c69-6bb9439d6d56",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}