{
  "annotation_id": "9c516f84-6942-49d9-804b-019b92c02523",
  "date_created": "2026-03-02T18:01:38.007000Z",
  "date_modified": "2026-03-02T18:01:38.007000Z",
  "file_hash": "05e252a9279ae99ebe2b73da2ae5581ff8a2b3edf2b3c581577b22ee589e7667",
  "private": false,
  "record": {
    "abstract": "We examine the measurability of the temporal ordering of two events, as well\nas event coincidences. In classical mechanics, a measurement of the\norder-of-arrival of two particles is shown to be equivalent to a measurement\ninvolving only one particle (in higher dimensions). In quantum mechanics, we\nfind that diffraction effects introduce a minimum inaccuracy to which the\ntemporal order-of-arrival can be determined unambiguously. The minimum\ninaccuracy of the measurement is given by dt=1/E where E is the total kinetic\nenergy of the two particles. Similar restrictions apply to the case of\ncoincidence measurements. We show that these limitations are much weaker than\nlimitations on measuring the time-of-arrival of a particle to a fixed location.",
    "arxiv_id": "quant-ph/0003130",
    "authors": [
      "J. Oppenheim",
      "B. Reznik",
      "W. Unruh"
    ],
    "categories": [
      "quant-ph",
      "gr-qc"
    ],
    "doi": "10.1088/0305-4470/35/35/308",
    "journal_ref": "J.Phys.A35:7641-7652,2002",
    "title": "Temporal Ordering in Quantum Mechanics",
    "url": "https://arxiv.org/abs/quant-ph/0003130"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0945adc8-3446-4085-be85-b99f6a5bf859",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}