{
  "annotation_id": "23e85bd6-2070-49d5-8a35-a63b602884ed",
  "date_created": "2026-03-02T18:01:42.362000Z",
  "date_modified": "2026-03-02T18:01:42.362000Z",
  "file_hash": "f75e9c5f34ee32a28942da52bc585b0eddeb0d3f0276e83338ab0a585291e80d",
  "private": false,
  "record": {
    "abstract": "In conventional quantum nondemolition measurements, the interaction between\nsignal and probe preserves the measured variable. Alternatively, it is possible\nto restore the original value of the variable by feedback. In this paper, we\ndescribe a quantum nondemolition measurement of a quadrature component of the\nlight field using a feedback compensated beam splitter. The noise induced by\nthe vacuum port of the beam splitter is compensated by a linear feedback\nresulting in an effective amplification of the observed variable. This\namplification is then be reversed by optical parametric amplification to\nrestore the original value of the field component.",
    "arxiv_id": "quant-ph/0103106",
    "authors": [
      "Holger F. Hofmann",
      "Takayoshi Kobayashi",
      "Akira Furusawa"
    ],
    "categories": [
      "quant-ph",
      "physics.optics"
    ],
    "title": "Quantum nondemolition measurement of a light field component by a   feedback compensated beam splitter",
    "url": "https://arxiv.org/abs/quant-ph/0103106"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ac8682e7-009e-421d-8725-801354f3ba61",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}