{
  "annotation_id": "6aa42e8c-8a7d-4fbd-9c55-eb1550916829",
  "date_created": "2026-03-02T18:01:59.680000Z",
  "date_modified": "2026-03-02T18:01:59.680000Z",
  "file_hash": "893bf6c618067d4b3e00950f0fa8701e65dd9e71d4fbd1a5d5c2554c54f243fa",
  "private": false,
  "record": {
    "abstract": "We address the problem of estimating the expectation value \u003cO\u003e of an\narbitrary operator O via a universal measuring apparatus that is independent of\nO, and for which the expectation values for different operators are obtained by\nchanging only the data-processing. The ``universal detector\u0027\u0027 performs a joint\nmeasurement on the system and on a suitably prepared ancilla. We characterize\nsuch universal detectors, and show how they can be obtained either via Bell\nmeasurements or via local measurements and classical communication between\nsystem and ancilla.",
    "arxiv_id": "quant-ph/0306025",
    "authors": [
      "G. M. D\u0027Ariano",
      "P. Perinotti",
      "M. F. Sacchi"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1209/epl/i2003-10079-1",
    "journal_ref": "Europhys. Lett. 65, 165 (2004)",
    "title": "Quantum universal detectors",
    "url": "https://arxiv.org/abs/quant-ph/0306025"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8ca472df-9e34-4637-a31e-0a5a06058830",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}