{
  "abstract": "Coherent perfect absorption (CPA) extinguishes optical fields through interference and dissipation, but conventional implementations rely on material loss that is largely fixed after fabrication. Here we demonstrate all-optically controllable CPA based on frequency conversion in a periodically poled lithium niobate waveguide resonator. Pump-driven frequency conversion couples a resonant signal field at 1581 nm in the main system to a non-resonant environmental mode at 780 nm, creating a dynamically tunable effective loss channel. The nonlinear cavity acts as a tunable lossy beamsplitter without intrinsic material absorption. Under coherent two-sided signal injection, we observe up to 92 % absorption. We further introduce environment-assisted CPA by injecting an external field into the frequency-converted environmental mode, turning the environment from a passive loss reservoir into an addressable coherent control port. Our results establish a frequency-conversion-based platform for all-optical control of dissipation in CPA, combining pump-tunable loss with environment-assisted coherent control.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.04682",
  "author_total": 3,
  "authors": [
    {
      "name": "Rikizo Ikuta"
    },
    {
      "name": "Hirokazu Kobayashi"
    },
    {
      "name": "Hiroki Takahashi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ewyqcr6y37wf6.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.04682",
  "fulltext_url": null,
  "id": "ewyqcr6y37wf6",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.04682",
  "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",
      "physics.optics"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3107|Quantum Mechanics and Non-Hermitian Physics"
    ]
  ],
  "openalex": "W7167617382",
  "pdf_url": "https://arxiv.org/pdf/2607.04682",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ewyqcr6y37wf6.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:12Z",
      "native_id": "2607.04682",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.04682"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "All-optical control of coherent perfect absorption via frequency conversion",
  "title_text": "All-optical control of coherent perfect absorption via frequency conversion",
  "type": "preprint",
  "updated_at": "2026-10-30T12:20:12Z",
  "url": "https://research.draconitic.com/paper/ewyqcr6y37wf6",
  "venue": "arXiv",
  "versions": []
}