{
  "annotation_id": "3a45c628-36f3-4be3-93d0-7f6d97eedc44",
  "date_created": "2026-03-02T18:02:34.646000Z",
  "date_modified": "2026-03-02T18:02:34.646000Z",
  "file_hash": "f4459499d7ffb92e1cb26d637a9cdb7e379488a7b67be7770116cfbde5cf64be",
  "private": false,
  "record": {
    "abstract": "Pure entangled states of two spatial qudits have been produced by using the\nmomentum transverse correlation of the parametric down-converted photons [Phys.\nRev. Lett. \\textbf{94} 100501]. Here we show a generalization of this process\nto enable the creation of mixed states of spatial qudits and by using the\ntechnique proposed we generate mixed states of spatial qubits. We also report\nhow the process of quantum tomography is experimentally implemented to\ncharacterize these states. This tomographic reconstruction is based on the free\nevolution of spatial qubits, coincidence detection and a filtering process. The\nreconstruction method can be generalized for the case of two spatial qudits.",
    "arxiv_id": "quant-ph/0703108",
    "authors": [
      "G. Lima",
      "F. A. Torres-Ruiz",
      "L. Neves",
      "A. Delgado",
      "C. Saavedra",
      "S. P\u00e1dua"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/1742-6596/84/1/012012",
    "title": "State reconstruction for composite systems of two spatial qubits",
    "url": "https://arxiv.org/abs/quant-ph/0703108"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "905d4d71-a4f4-4dc7-8abe-20bb2df50618",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}