{
  "annotation_id": "59fc411d-5cdf-4272-aa00-991a024ba375",
  "date_created": "2026-03-02T18:01:38.623000Z",
  "date_modified": "2026-03-02T18:01:38.623000Z",
  "file_hash": "ce1fd035c95f44af768bca5baa3adcb0c7a2349767533b5a3e401e0963c49a32",
  "private": false,
  "record": {
    "abstract": "An \"almost diagonal\" reduced density matrix (in coordinate representation) is\nusually a result of environment induced decoherence and is considered the sign\nof classical behavior. We point out that the proton of a ground state hydrogen\natom can possess such a density matrix. We demonstrate on this example that an\n\"almost diagonal\" reduced density matrix may derive from an interaction with a\nlow number of degrees of freedom (in our case with a single electron) which\nplay the role of the environment. We also show that decoherence effects in our\nexample can only be observed if the interaction with the measuring device is\nsignificantly faster than the interaction with the environment (the electron).\nIn the opposite case, when the interaction with the environment is significant\nduring the measurement process, coherence is restored.\n  Finally, we propose a neutron scattering experiment on cold He atoms to\nobserve decoherence which shows up as an additional contribution to the\ndifferential scattering cross section.",
    "arxiv_id": "quant-ph/0008131",
    "authors": [
      "Gyula Bene",
      "Szabolcs Borsanyi"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Decoherence within a single atom",
    "url": "https://arxiv.org/abs/quant-ph/0008131"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "7682c84c-2a76-4c7e-b943-5dcb47bfac0b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}