{
  "abstract": "We present an analytical framework for the emergence of nonclassical radiation in strongly laser-driven quantum systems, with a focus on high-order harmonic generation (HHG). Starting from a Pauli–Fierz description, we employ a parametric factorization of the coupled light–matter wavefunction that reduces the dynamics to coupled equations for a field-driven electronic state and a quantized light mode. Within this framework, we identify a simple and predictive mechanism for nonclassicality: it originates from the nonlinear dependence of the electronic dipole response on the light-mode coordinate. An approximately constant dipole yields coherent radiation, a linear dependence produces squeezing, and higher-order nonlinearities give rise to Wigner-function negativity. We illustrate this mechanism for atomic and molecular model systems and analyze its scaling in multi-emitter configurations, indicating routes toward high-photon-number nonclassical radiation in HHG. Our results provide a transparent connection between strong-field dynamics and quantum-optical properties of emitted light, offering a basis for engineering nonclassical states in intense laser–matter interactions.",
  "abstract_shown": true,
  "affiliations": [
    "Friedrich Schiller University Jena",
    "Fraunhofer Institute for Applied Optics and Precision Engineering"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Ivan Gonoskov",
      "orcid": "0000-0001-7873-4774"
    },
    {
      "affs": [
        0
      ],
      "name": "Christian Hünecke"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Stefanie Gräfe",
      "orcid": "0000-0002-1747-5809"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9hzxgdkdyq6g6.bib",
  "cited_by": 0,
  "doi": "10.1088/1367-2630/aeae67",
  "fulltext_url": null,
  "id": "9hzxgdkdyq6g6",
  "issns": [
    "1367-2630"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.1088/1367-2630/aeae67",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3107|Laser-Matter Interactions and Applications"
    ]
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  "openalex": "W7117771774",
  "pdf_url": "https://iopscience.iop.org/article/10.1088/1367-2630/aeae67/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": "IOP Publishing",
  "ris": "https://research.draconitic.com/paper/9hzxgdkdyq6g6.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:56Z",
      "native_id": "10.1088/1367-2630/aeae67",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.1088/1367-2630/aeae67"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "openalex:3107|Laser-Matter Interactions and Applications",
      "subfield": "optics-photonics"
    }
  ],
  "title": "Emergence of nonclassical radiation in strongly laser-driven quantum systems",
  "title_text": "Emergence of nonclassical radiation in strongly laser-driven quantum systems",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:17:56Z",
  "url": "https://research.draconitic.com/paper/9hzxgdkdyq6g6",
  "venue": "New Journal of Physics",
  "versions": []
}