{
  "annotation_id": "dab8f709-731b-47b3-90f3-83e398dfc47f",
  "date_created": "2026-03-02T18:01:48.467000Z",
  "date_modified": "2026-03-02T18:01:48.467000Z",
  "file_hash": "5c3f5e3c9e6aa6ac9992f451509e1dcf34d6a54f78ada14c7ade93aead83ab11",
  "private": false,
  "record": {
    "abstract": "We propose a quantum device that can approximate any projective measurement\non a qubit. The desired measurement basis is selected by the quantum state of a\n\"program register\". The device is optimized with respect to maximal average\nfidelity (assuming uniform distribution of measurement bases). An interesting\nresult is that if one uses two qubits in the same state as a program the\naverage fidelity is higher than if he/she takes the second program qubit in the\northogonal state (with respect to the first one). The average information\nobtainable by the proposed measurements is also calculated and it is shown that\nit can get different values even if the average fidelity stays constant.\nPossible experimental realization of the simplest proposed device is presented.",
    "arxiv_id": "quant-ph/0202152",
    "authors": [
      "Jaromir Fiurasek",
      "Miloslav Dusek",
      "Radim Filip"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.89.190401",
    "journal_ref": "Phys. Rev. Lett. 89, 190401 (2002).",
    "title": "Universal measurement apparatus controlled by quantum software",
    "url": "https://arxiv.org/abs/quant-ph/0202152"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "5038ba78-fee3-48b6-a617-3195410130e7",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}