{
  "abstract": "Measurement error in the Watanabe-Sagawa-Ueda formulation is the excess estimation error of a classical record over the quantum statistical limit. We show that, at the quantum-instrument level, this excess has an exact decomposition. The record-only error matrix equals a residual-aware error matrix plus a positive Schur-complement term fixed by Fisher information left in the unread post-measurement system. Thus measurement error separates into intrinsic instrument loss and record-restriction loss",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.31311",
  "author_total": 2,
  "authors": [
    {
      "name": "Masayuki Ohzeki"
    },
    {
      "name": "Taiga Suzuki"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/08et3ex55cgpv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.31311",
  "fulltext_url": null,
  "id": "08et3ex55cgpv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.31311",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7214659559",
  "pdf_url": "https://arxiv.org/pdf/2609.31311",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/08et3ex55cgpv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:12Z",
      "native_id": "2609.31311",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.31311"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Residual Fisher Information in Measurement-Error Uncertainty",
  "title_text": "Residual Fisher Information in Measurement-Error Uncertainty",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:12Z",
  "url": "https://research.draconitic.com/paper/08et3ex55cgpv",
  "venue": "arXiv",
  "versions": []
}