{
  "annotation_id": "bee11799-2d81-425d-9c24-606c02a7fd52",
  "date_created": "2026-03-02T18:01:48.832000Z",
  "date_modified": "2026-03-02T18:01:48.832000Z",
  "file_hash": "2c5f26bd89d12076fce422271670889037ff283ab182c46fb41a68dfd102c428",
  "private": false,
  "record": {
    "abstract": "Heisenberg in 1929 introduced the \"collapse of the wavepacket\" into quantum\ntheory. We review here an experiment at Berkeley which demonstrated several\naspects of this idea. In this experiment, a pair of daughter photons was\nproduced in an entangled state, in which the sum of their two energies was\nequal to the sharp energy of their parent photon, in the nonlinear optical\nprocess of spontaneous parametric down-conversion. The wavepacket of one\ndaughter photon collapsed upon a measurement-at-a-distance of the other\ndaughter\u0027s energy, in such a way that the total energy of the two-photon system\nwas conserved. Heisenberg\u0027s energy-time uncertainty principle was also\ndemonstrated to hold in this experiment.",
    "arxiv_id": "quant-ph/0201036",
    "authors": [
      "R. Y. Chiao",
      "P. G. Kwiat"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1002/1521-3978(200205)50:5/7\u003c614::AID-PROP614\u003e3.0.CO;2-R",
    "title": "Heisenberg\u0027s Introduction of the `Collapse of the Wavepacket\u0027 into   Quantum Mechanics",
    "url": "https://arxiv.org/abs/quant-ph/0201036"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d8ef6261-b9f6-442c-adff-9d1b34b1ca85",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}