{
  "annotation_id": "e898d5db-9a3c-40fb-93de-e158c96990c7",
  "date_created": "2026-03-02T18:02:05.752000Z",
  "date_modified": "2026-03-02T18:02:05.752000Z",
  "file_hash": "d18a790930dd5c6206eee60ab351d8b1e89c00f397d9585fa60c454e0fb185c9",
  "private": false,
  "record": {
    "abstract": "We present an optical implementation of two programmable quantum measurement\ndevices. The first one serves for unambiguous discrimination of two\nnonorthogonal states of a qubit. The particular pair of states to be\ndiscriminated is specified by the quantum state of a program qubit. The second\ndevice can perform von Neumann measurements on a single qubit in any basis\nlocated on the equator of the Bloch sphere. Again, the basis is selected by the\nstate of a program qubit. In both cases the data and program qubits are\nrepresented by polarization states of photons. The experimental apparatus\nexploits the fact that two Bell states can be distinguished solely by means of\nlinear optics. The outcome corresponding to the remaining two Bell states\nrepresents an inconclusive result.",
    "arxiv_id": "quant-ph/0401166",
    "authors": [
      "Jan Soubusta",
      "Antonin Cernoch",
      "Jaromir Fiurasek",
      "Miloslav Dusek"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.69.052321",
    "journal_ref": "Phys. Rev. A 69, 052321 (2004).",
    "title": "Experimental realization of a programmable quantum-state discriminator   and a phase-covariant quantum multimeter",
    "url": "https://arxiv.org/abs/quant-ph/0401166"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "5eb60e85-1613-4dac-9f15-5c56953da796",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}