{
  "annotation_id": "31667c7f-f6a2-4a9e-bf9a-ce0a6e5e2548",
  "date_created": "2026-03-02T18:01:52.566000Z",
  "date_modified": "2026-03-02T18:01:52.566000Z",
  "file_hash": "1babe82c64b157866b485fda5a9548a85dc879854b14cdfd6c28aecb37f2ba76",
  "private": false,
  "record": {
    "abstract": "An n-qubit quantum register can in principle be completely controlled by\noperating on a single qubit that interacts with the register via an appropriate\nfixed interaction. We consider a hypothetical system consisting of n spin-1/2\nnuclei that interact with an electron spin via a magnetic interaction. We\ndescribe algorithms that measure non-trivial joint observables on the register\nby acting on the control spin only. For large n this is not an efficient model\nfor universal quantum computation but it can be modified to an efficient one if\none allows n possible positions of the control particle.\n  This toy model of measurements illustrates in which way specific interactions\nbetween the register and a probe particle support specific types of joint\nmeasurements in the sense that some joint observables can be measured by simple\nsequences of operations on the probe particle.",
    "arxiv_id": "quant-ph/0207134",
    "authors": [
      "Dominik Janzing",
      "Thomas Decker",
      "Thomas Beth"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.67.042320",
    "journal_ref": "Phys. Rev. A 67: 042320, 2003",
    "title": "Performing joint measurements and transformations on several qubits by   operating on a single control qubit",
    "url": "https://arxiv.org/abs/quant-ph/0207134"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "abb833c4-af08-40fc-b3e3-89d978811205",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}