{
  "annotation_id": "cda284c3-a339-4679-9ce2-c15eab89341e",
  "date_created": "2026-03-02T18:02:03.462000Z",
  "date_modified": "2026-03-02T18:02:03.462000Z",
  "file_hash": "8f3b8ceb18cb32cbc10091195b1eaf27fdcf0fea4a04755605ce6f146d5c19b9",
  "private": false,
  "record": {
    "abstract": "We show that, contrarily to the widespread belief, in quantum mechanics\nrepeatable measurements are not necessarily described by orthogonal\nprojectors--the customary paradigm of \"observable\". Nonorthogonal\nrepeatability, however, occurs only for infinite dimensions. We also show that\nwhen a non orthogonal repeatable measurement is performed, the measured system\nretains some \"memory\" of the number of times that the measurement has been\nperformed.",
    "arxiv_id": "quant-ph/0310041",
    "authors": [
      "F. Buscemi",
      "G. M. D\u0027Ariano",
      "P. Perinotti"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.92.070403",
    "journal_ref": "Phys. Rev. Lett 92, 070403 (2004)",
    "title": "There exist non orthogonal quantum measurements that are perfectly   repeatable",
    "url": "https://arxiv.org/abs/quant-ph/0310041"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "58c4f15d-70da-44e7-b4d8-747a5ad3d972",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}