{
  "annotation_id": "5a19933f-9aeb-4db6-869c-68bdc65e4495",
  "date_created": "2026-03-02T18:01:56.505000Z",
  "date_modified": "2026-03-02T18:01:56.505000Z",
  "file_hash": "8486df97535c253a761c33144f545726a23d2c50fe345e7b8512a61f75e4c40d",
  "private": false,
  "record": {
    "abstract": "Contractive states for a free quantum particle were introduced by Yuen [Yuen\nH P 1983 Phys. Rev. Lett. 51, 719] in an attempt to evade the standard quantum\nlimit for repeated position measurements. We show how appropriate families of\ntwo- and three component ``Schroedinger cat states\u0027\u0027 are able to support\nnon-trivial correlations between the position and momentum observables leading\nto contractive behavior. The existence of contractive Schroedinger cat states\nis suggestive of potential novel roles of non-classical states for precision\nmeasurement schemes.",
    "arxiv_id": "quant-ph/0303031",
    "authors": [
      "Lorenza Viola",
      "Roberto Onofrio"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/1367-2630/5/1/305",
    "journal_ref": "New Journal of Physics 5 (2003) 5.1-5.21",
    "title": "Contractive Schroedinger cat states for a free mass",
    "url": "https://arxiv.org/abs/quant-ph/0303031"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "750bef02-6c26-47fc-9f0d-ca8ac4eaa2bb",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}