{
  "annotation_id": "d32db2ed-f991-4467-a9b3-68df87e27341",
  "date_created": "2026-03-02T18:02:45.091000Z",
  "date_modified": "2026-03-02T18:02:45.091000Z",
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  "private": false,
  "record": {
    "abstract": "The density matrix of a spin s is fixed uniquely if the probabilities to\nobtain the value s upon measuring n.S are known for 4s(s+1) appropriately\nchosen directions n in space. These numbers are just the expectation values of\nthe density operator in coherent spin states, and they can be determined in an\nexperiment carried out with a Stern-Gerlach apparatus. Furthermore, the\nexperimental data can be inverted providing thus a parametrization of the\nstatistical operator by 4s(s+1) positive parameters.",
    "arxiv_id": "quant-ph/9903067",
    "authors": [
      "Jean-Pierre Amiet",
      "Stefan Weigert"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/0305-4470/32/25/101",
    "journal_ref": "J. Phys. A 32 (1999) L269",
    "title": "Reconstructing the density matrix of a spin s through Stern-Gerlach   measurements (II)",
    "url": "https://arxiv.org/abs/quant-ph/9903067"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "355ce6a5-777b-4db9-b624-ee19720252d4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}