{
  "annotation_id": "9381eec5-e77e-4580-8aa7-a7ce173c5f5f",
  "date_created": "2026-03-02T18:01:52.879000Z",
  "date_modified": "2026-03-02T18:01:52.879000Z",
  "file_hash": "9525e15182229e1c13596ab130e817d68364b9952321ce6af0ed3ac320a1d123",
  "private": false,
  "record": {
    "abstract": "We discuss the theory and experimental considerations of a quantum feedback\nscheme for producing deterministically reproducible spin squeezing. Continuous\nnondemolition atom number measurement from monitoring a probe field\nconditionally squeezes the sample. Simultaneous feedback of the measurement\nresults controls the quantum state such that the squeezing becomes\nunconditional. We find that for very strong cavity coupling and a limited\nnumber of atoms, the theoretical squeezing approaches the Heisenberg limit.\nStrong squeezing will still be produced at weaker coupling and even in free\nspace (thus presenting a simple experimental test for quantum feedback). The\nmeasurement and feedback can be stopped at any time, thereby freezing the\nsample with a desired amount of squeezing.",
    "arxiv_id": "quant-ph/0208160",
    "authors": [
      "L. K. Thomsen",
      "S. Mancini",
      "H. M. Wiseman"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/0953-4075/35/23/316",
    "journal_ref": "J. Phys. B: At. Mol. Opt. Phys. 35 (2002) 4937-4952",
    "title": "Continuous quantum nondemolition feedback and unconditional atomic spin   squeezing",
    "url": "https://arxiv.org/abs/quant-ph/0208160"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "75f0b2e0-2867-421c-8ab3-296bcb65b62d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}