{
  "annotation_id": "77a95e2e-d6a5-4979-abdb-829e1f794c80",
  "date_created": "2026-03-02T18:01:48.945000Z",
  "date_modified": "2026-03-02T18:01:48.945000Z",
  "file_hash": "039a86a5cd3c9f7d73ac87fbddb1c9ebeb05104588f15c3178ea16daebb754ce",
  "private": false,
  "record": {
    "abstract": "Using continuous wave superposition of spatial modes, we demonstrate\nexperimentally displacement measurement of a light beam below the standard\nquantum limit. Multimode squeezed light is obtained by mixing a vacuum squeezed\nbeam and a coherent beam that are spatially orthogonal. Although the resultant\nbeam is not squeezed, it is shown to have strong internal spatial correlations.\nWe show that the position of such a light beam can be measured using a split\ndetector with an increased precision compared to a classical beam. This method\ncan be used to improve the sensitivity of small displacement measurements.",
    "arxiv_id": "quant-ph/0204017",
    "authors": [
      "N. Treps",
      "U. Andersen",
      "B. Buchler",
      "P. K. Lam",
      "A. Maitre",
      "H. -A. Bachor",
      "C. Fabre"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.88.203601",
    "journal_ref": "Phys. Rev. Lett. 88, 203601 (2002)",
    "title": "Surpassing the standard quantum limit for optical imaging using   non-classical multimode light",
    "url": "https://arxiv.org/abs/quant-ph/0204017"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "085f337a-5da5-4a4d-a191-54a78d3a8862",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}