{
  "annotation_id": "22a26855-51c8-4bea-85aa-f3ce842afbec",
  "date_created": "2026-03-02T18:01:48.278000Z",
  "date_modified": "2026-03-02T18:01:48.278000Z",
  "file_hash": "29aefa5b8fc7fe3e3b1fbfc205b610a0f13a76625811d5e8f3b73eca93b0ddda",
  "private": false,
  "record": {
    "abstract": "The usual formulation of quantum theory is rather abstract. In recent work I\nhave shown that we can, nevertheless, obtain quantum theory from five\nreasonable axioms. Four of these axioms are obviously consistent with both\nclassical probability theory and quantum theory. The remaining axiom requires\nthat there exists a continuous reversible transformation between any two pure\nstates. The requirement of continuity rules out classical probability theory.\nIn this paper I will summarize the main points of this new approach. I will\nleave out the details of the proof that these axioms are equivalent to the\nusual formulation of quantum theory (for these see quant-ph/0101012).",
    "arxiv_id": "quant-ph/0111068",
    "authors": [
      "Lucien Hardy"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Why Quantum Theory?",
    "url": "https://arxiv.org/abs/quant-ph/0111068"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "0fd33d6b-f025-4f46-996e-11376592ef31",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}