{
  "abstract": "Modern precision experiments often probe unknown classical fields with bosonic sensors in quantum-noise-limited regimes where vacuum fluctuations limit conventional readout. We introduce quantum signal learning, a sensing framework that extends metrology to a broader property-learning setting, and propose a quantum-enhanced protocol that simultaneously estimates many properties of a classical signal with shot noise suppressed below the vacuum level. Our scheme requires only two-mode squeezing, passive optics, and static homodyne measurements, and enables post hoc classical estimation of many properties from the same experimental dataset. We prove that our protocol enables a quantum speedup for common classical sensing tasks, including measuring electromagnetic correlations, real-time feedback control of interferometric cavities, and Fourier-domain matched filtering. To establish these separations, we introduce an optimal-transport conditioning method and show both worst-case exponential separations from all entanglement-free strategies and practical speedups over homodyne and heterodyne baselines. We further show that when squeezing is treated as a resource, a protocol with squeezed light can sense a structured classical background exponentially faster than any coherent classical probe.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "article",
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "name": "Jordan Cotler"
    },
    {
      "name": "Daine L. Danielson"
    },
    {
      "name": "Ishaan Kannan"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1xyta0wf3w9ck.bib",
  "cited_by": 0,
  "doi": "10.1103/6ps1-mw9l",
  "fulltext_url": "http://doi.org/10.1103/6ps1-mw9l",
  "id": "1xyta0wf3w9ck",
  "issns": [
    "2160-3308"
  ],
  "landing_url": "http://link.aps.org/doi/10.1103/6ps1-mw9l",
  "language": "en",
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "feed-journal",
      "physics/general"
    ],
    [
      "lcc",
      "QC1-999"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7130737683",
  "pdf_url": "http://doi.org/10.1103/6ps1-mw9l",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": "American Physical Society",
  "ris": "https://research.draconitic.com/paper/1xyta0wf3w9ck.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:16Z",
      "native_id": "10.1103/6ps1-mw9l",
      "source": "feed-aps",
      "url": "http://link.aps.org/doi/10.1103/6ps1-mw9l"
    },
    {
      "first_seen": "2026-10-30T13:44:08Z",
      "native_id": "86dc6bbc9bc64ae2b712238cddeb7b02",
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      "url": "https://doi.org/10.1103/6ps1-mw9l"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "journal-openalex:3107|Quantum many-body systems",
      "subfield": "amo"
    }
  ],
  "title": "Quantum Advantage for Sensing Properties of Classical Fields",
  "title_text": "Quantum Advantage for Sensing Properties of Classical Fields",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T13:44:08Z",
  "url": "https://research.draconitic.com/paper/1xyta0wf3w9ck",
  "venue": "Physical Review X",
  "versions": []
}