{
  "annotation_id": "74524d1e-a69d-4a7c-ba05-ecb9b2c10af6",
  "date_created": "2026-03-02T18:01:59.137000Z",
  "date_modified": "2026-03-02T18:01:59.137000Z",
  "file_hash": "11f222e286890eaa2ab2a818bb26124d23b8afb0cde8baee79cad45c2a5122ea",
  "private": false,
  "record": {
    "abstract": "We report on tomographic means to study the stability of a qubit register\nbased on a string of trapped ions. In our experiment, two ions are held in a\nlinear Paul trap and are entangled deterministically by laser pulses that\ncouple their electronic and motional states. We reconstruct the density matrix\nusing single qubit rotations and subsequent measurements with near-unity\ndetection efficiency. This way, we characterize the created Bell states, the\nstates into which they subsequently decay, and we derive their entanglement,\napplying different entanglement measures.",
    "arxiv_id": "quant-ph/0307210",
    "authors": [
      "C. F. Roos",
      "G. P. T. Lancaster",
      "M. Riebe",
      "H. Haeffner",
      "W. Haensel",
      "S. Gulde",
      "C. Becher",
      "J. Eschner",
      "F. Schmidt-Kaler",
      "R. Blatt"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Tomography of entangled massive particles",
    "url": "https://arxiv.org/abs/quant-ph/0307210"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "10f2dbea-30a9-4df3-9b65-af077f678a96",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}