{
  "abstract": "A ruler reads an unknown length against a calibrated scale. The quantum data ruler reads a matrix element of an unknown state against the signal of a known reference, from their ratio. It is exact for any Hamiltonian and any time, since transition operators change by a state-dependent constant times one function of time, removing the vanishing-signal limit. The readout is unbiased under dephasing and amplitude damping, and recovers the coherent ergotropy of a quantum battery that two-point measurement erases. The structure survives the classical limit as action--angle Fourier modes.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.07827",
  "author_total": 1,
  "authors": [
    {
      "name": "Wangjun Lu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/53gfep42cjhrr.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.07827",
  "fulltext_url": null,
  "id": "53gfep42cjhrr",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.07827",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3109|Advanced Thermodynamics and Statistical Mechanics"
    ]
  ],
  "openalex": "W7220984886",
  "pdf_url": "https://arxiv.org/pdf/2610.07827",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-06",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/53gfep42cjhrr.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:22Z",
      "native_id": "2610.07827",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.07827"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Quantum Data Ruler",
  "title_text": "Quantum Data Ruler",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:22Z",
  "url": "https://research.draconitic.com/paper/53gfep42cjhrr",
  "venue": "arXiv",
  "versions": []
}