{
  "annotation_id": "ef6976e2-7812-4286-94e2-88e0de26979f",
  "date_created": "2026-03-02T18:02:45.094000Z",
  "date_modified": "2026-03-02T18:02:45.094000Z",
  "file_hash": "5d47fae5cf73866c2a32c579d994a6a7d8d81eb9f9f98c04c9b5b6b0793076c7",
  "private": false,
  "record": {
    "abstract": "The dephasing influence of a dissipative environment reduces linear\nsuperpositions of macroscopically distinct quantum states (sometimes also\ncalled Schr\\\"odinger cat states) usually almost immediately to a statistical\nmixture. This process is called decoherence. Couplings to the environment with\na certain symmetry can lead to slow decoherence. In this Letter we show that\nthe collective coupling of a large number of two-level atoms to an\nelectromagnetic field mode in a cavity that leads to the phenomena of\nsuperradiance has such a symmetry, at least approximately. We construct\nsuperpositions of macroscopically distinct quantum states decohering only on a\nclassical time scale and propose an experiment in which the extraordinarily\nslow decoherence should be observable.",
    "arxiv_id": "quant-ph/9903040",
    "authors": [
      "Daniel Braun",
      "Petr A. Braun",
      "Fritz Haake"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.mes-hall",
      "physics.optics"
    ],
    "doi": "10.1016/S0030-4018(99)00480-0",
    "journal_ref": "Opt. Comm. {\\bf 179}, 195 (2000)",
    "title": "Long-lived Quantum Coherence between Macroscopically Distinct States in   Superradiance",
    "url": "https://arxiv.org/abs/quant-ph/9903040"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1f3a96e7-be24-4261-a030-685a24755c7d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}