{
  "annotation_id": "161cd84f-8cf8-4560-bd5a-7937c9c3e463",
  "date_created": "2026-03-02T18:01:38.497000Z",
  "date_modified": "2026-03-02T18:01:38.497000Z",
  "file_hash": "de61151b5175534f15e3ed885f9eae257396ba46231955775388a236390302a1",
  "private": false,
  "record": {
    "abstract": "We analyze the estimation of a finite ensemble of quantum bits which have\nbeen sent through a depolarizing channel. Instead of using the depolarized\nqubits directly, we first apply a purification step and show that this improves\nthe fidelity of subsequent quantum estimation. Even though we lose some qubits\nof our finite ensemble the information is concentrated in the remaining\npurified ones.",
    "arxiv_id": "quant-ph/0004096",
    "authors": [
      "Holger Mack",
      "Dietmar G. Fischer",
      "Matthias Freyberger"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.62.042301",
    "journal_ref": "Phys. Rev. A 62, 042301 (2000)",
    "title": "Enhanced Quantum Estimation via Purification",
    "url": "https://arxiv.org/abs/quant-ph/0004096"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "23415edb-1e77-4e51-82b7-4f8d2f51222a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}