{
  "annotation_id": "1cffa594-e32f-4827-82ce-4dc4cbd0f445",
  "date_created": "2026-03-02T18:02:02.263000Z",
  "date_modified": "2026-03-02T18:02:02.263000Z",
  "file_hash": "7a74b906971893cab22e2614fa82c4730d5199126b4f25b63125d23755c9b1cb",
  "private": false,
  "record": {
    "abstract": "We present an experimental demonstration of closed-loop quantum parameter\nestimation in which real-time feedback is used to achieve robustness to\nmodeling uncertainty. By performing broadband estimation of a magnetic field\nacting on hyperfine spins in a cold atom ensemble, we show that accuracy is not\ncompromised by fluctuations in total atom number even though the measured\nsignal in our canonical configuration depends only on the product of the field\nand atom number. This methodology could be essential for efforts to utilize\nconditional squeezing in spin-resonance measurements.",
    "arxiv_id": "quant-ph/0309034",
    "authors": [
      "JM Geremia",
      "John K. Stockton",
      "Hideo Mabuchi"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Closed-loop Quantum Parameter Estimation: Spins in a Magnetic Field",
    "url": "https://arxiv.org/abs/quant-ph/0309034"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "6bb5197f-92b4-4d7b-be08-343422b110be",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}