{
  "annotation_id": "796e4154-8cf1-406f-b6e0-ba0bc702e2ad",
  "date_created": "2026-03-02T18:02:03.198000Z",
  "date_modified": "2026-03-02T18:02:03.198000Z",
  "file_hash": "db4a45cd9ae71dd8df379842d985ef29c46ab7ab864178b4f137dbbb3cc62845",
  "private": false,
  "record": {
    "abstract": "We study a general theory on the interference of a two-photon wavepacket in a\nbeam splitter. The theory is carried out in the Schr\\\"{o}dinger picture so that\nthe quantum nature of the two-photon interference is explicitly presented. We\nfind that the topological symmetry of the probability-amplitude spectrum of the\ntwo-photon wavepacket dominates the manners of two-photon interference which\nare distinguished according to increasing and decreasing the coincidence\nprobability for the absence of interference. However, two-photon entanglement\ncan be witnessed by the interference manner. We demonstrate the necessary and\nsufficient conditions for the perfect two-photon interference. For a two-photon\nentangled state with an anti-symmetric spectrum, it passes a 50/50 beam\nsplitter with the perfect transparency. The theory contributes an unified\nunderstanding to a variety of the two-photon interference effects.",
    "arxiv_id": "quant-ph/0311011",
    "authors": [
      "Kaige Wang"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Quantum Theory of Two-Photon Wavepacket Interference in a Beam Splitter",
    "url": "https://arxiv.org/abs/quant-ph/0311011"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4ee6e65f-d4f0-48f4-a265-011a5cd3f499",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}