{
  "annotation_id": "c6d0f42a-777e-4269-a684-fb25483d14a5",
  "date_created": "2026-03-02T18:02:47.594000Z",
  "date_modified": "2026-03-02T18:02:47.594000Z",
  "file_hash": "853a692e2187ff80fe570dfb050bede7e969a826f0df713528a9171f8a225417",
  "private": false,
  "record": {
    "abstract": "It is shown that the quantum jumps in the photon number n from zero to one or\nmore photons induced by backaction evasion quantum nondemolition measurements\nof a quadrature component x of the vacuum light field state are strongly\ncorrelated with the quadrature component measurement results. This correlation\ncorresponds to the operator expectation value \u003cxnx\u003e which is equal to one\nfourth for the vacuum even though the photon number eigenvalue is zero. Quantum\nnondemolition measurements of a quadrature component can thus provide\nexperimental evidence of the nonclassical operator ordering dependence of the\ncorrelations between photon number and field components in the vacuum state.",
    "arxiv_id": "quant-ph/9912072",
    "authors": [
      "Holger F. Hofmann",
      "Takayoshi Kobayashi",
      "Akira Furusawa"
    ],
    "categories": [
      "quant-ph",
      "physics.optics"
    ],
    "doi": "10.1103/PhysRevA.62.013806",
    "journal_ref": "Phys. Rev. A 62, 013806 (2000)",
    "title": "Nonclassical correlations of photon number and field components in the   vacuum state",
    "url": "https://arxiv.org/abs/quant-ph/9912072"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "410dedbe-28ac-4fe8-b454-5c7853c292e9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}