{
  "annotation_id": "e8f473f3-636d-4990-afc5-bb1c1611379b",
  "date_created": "2026-03-02T18:02:27.397000Z",
  "date_modified": "2026-03-02T18:02:27.397000Z",
  "file_hash": "44dbb6f76daae0aeba7ed0405456bacf1f12ca8c4bc2901a2132bec76fed6eb8",
  "private": false,
  "record": {
    "abstract": "Non-classical joint measurements can hugely improve the efficiency with which\ncertain figures of merit of quantum systems are measured. We use such a\nmeasurement to determine a particular figure of merit, the purity, for a\npolarization qubit. In the process we highlight some of subtleties involved in\ncommon methods for generating decoherence in quantum optics.",
    "arxiv_id": "quant-ph/0606191",
    "authors": [
      "R. B. A. Adamson",
      "L. K. Shalm",
      "A. M. Steinberg"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.75.012104",
    "journal_ref": "Phys. Rev. A 75, 012104 (2007)",
    "title": "Preparation of pure and mixed polarization qubits and the direct   measurement of figures of merit",
    "url": "https://arxiv.org/abs/quant-ph/0606191"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "cad71e00-cd0a-429c-804b-a4b9950f4962",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}