{
  "abstract": "Bicolor quantum imaging can reach, in principle, phase supersensitivity approaching the Heisenberg limit using squeezed light from high-gain parametric down-conversion, but established quantum-imaging setups typically operate in the low-gain, spontaneous regime, where such scaling is inaccessible. Here, we show experimentally and theoretically that a symmetric nonlinear interferometer, even in the spontaneous regime, retains a phase-sensitivity advantage over configurations where entanglement is not exploited as a quantum-metrological resource, although the achievable phase sensitivity remains shot-noise-limited. This advantage appears as a shift of the optimal working point toward the dark fringe, the low-gain signature of the mechanism underlying high-gain supersensitivity. We derive design choices for phase-optimized nonlinear interferometers accordingly, favoring configurations that exploit entanglement as a metrological resource and specifying their optimal operating point.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.07338",
  "author_total": 4,
  "authors": [
    {
      "name": "Jonas L. Moos"
    },
    {
      "name": "Cristofero Oglialoro"
    },
    {
      "name": "Enno Giese"
    },
    {
      "name": "Markus Gräfe"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/afs7f2sth45nr.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.07338",
  "fulltext_url": null,
  "id": "afs7f2sth45nr",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.07338",
  "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",
      "physics.optics"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7212071445",
  "pdf_url": "https://arxiv.org/pdf/2609.07338",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/afs7f2sth45nr.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:48Z",
      "native_id": "2609.07338",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.07338"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Phase estimation in spontaneous nonlinear interferometry for enhanced quantum imaging",
  "title_text": "Phase estimation in spontaneous nonlinear interferometry for enhanced quantum imaging",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:48Z",
  "url": "https://research.draconitic.com/paper/afs7f2sth45nr",
  "venue": "arXiv",
  "versions": []
}