{
  "annotation_id": "a44ee422-02a4-4840-a514-7de7c630fc31",
  "date_created": "2026-03-02T18:02:06.270000Z",
  "date_modified": "2026-03-02T18:02:06.270000Z",
  "file_hash": "e5083868d84c9206b3f69a6c502fd62ce7db3a0440dff500227cfe6ac6e07ab0",
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  "record": {
    "abstract": "A weak continuous quantum measurement of an atomic spin ensemble can be\nimplemented via Faraday rotation of an off-resonance probe beam, and may be\nused to create and probe nonclassical spin states and dynamics. We show that\nthe probe light shift leads to nonlinearity in the spin dynamics and limits the\nuseful Faraday measurement window. Removing the nonlinearity allows a\nnon-perturbing measurement on the much longer timescale set by decoherence. The\nnonlinear spin Hamiltonian is of interest for studies of quantum chaos and\nreal-time quantum state estimation.",
    "arxiv_id": "quant-ph/0403096",
    "authors": [
      "Greg A. Smith",
      "Souma Chaudhury",
      "Andrew Silberfarb",
      "Ivan H. Deutsch",
      "Poul S. Jessen"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.93.163602",
    "journal_ref": "Phys. Rev. Lett. 93 p.163602 (October 15, 2004)",
    "title": "Continuous Weak Measurement and Nonlinear Dynamics in a Cold Spin   Ensemble",
    "url": "https://arxiv.org/abs/quant-ph/0403096"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "cc5a7b8d-a24c-44c7-bb45-9f17800f7154",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}