{
  "annotation_id": "db0adff2-e0b8-42e3-99a4-00ed320d30e7",
  "date_created": "2026-03-02T18:02:40.983000Z",
  "date_modified": "2026-03-02T18:02:40.983000Z",
  "file_hash": "1664add7e055c1eed697446073d9f6747fb19b3c4eeb2dea14d0fb33e732ce0f",
  "private": false,
  "record": {
    "abstract": "We investigate the possibilities of preserving and manipulating the coherence\nof atomic two-level systems by ideal projective homodyne detection and\nfeedback. For this purpose, the photon emission process is described on time\nscales much shorter than the lifetime of the excited state using a model based\non Wigner-Weisskopf theory. The backaction of this emission process is\nanalytically described as a quantum diffusion of the Bloch vector. It is shown\nthat the evolution of the atomic wavefunction can be controlled completely\nusing the results of homodyne detection. This allows the stabilization of a\nknown quantum state or the creation of coherent states by a feedback mechanism.\nHowever, the feedback mechanism can never compensate the dissipative effects of\nquantum fluctuations even though the coherent state of the system is known at\nall times.",
    "arxiv_id": "quant-ph/9707046",
    "authors": [
      "Holger F. Hofmann",
      "Guenter Mahler",
      "Ortwin Hess"
    ],
    "categories": [
      "quant-ph",
      "physics.atom-ph",
      "physics.optics"
    ],
    "doi": "10.1103/PhysRevA.57.4877",
    "journal_ref": "Phys.Rev.A 57, 4877 (1998)",
    "title": "Quantum control of atomic systems by time resolved homodyne detection   and feedback",
    "url": "https://arxiv.org/abs/quant-ph/9707046"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7e1cb08a-2e41-4efa-be5e-a7bb3e2de2f2",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}