{
  "abstract": "Optical decoherence degrades quantum correlations in squeezed states of light, severely limiting the quantum-nondemolition (QND) sensitivity of gravitational-wave detectors. Here, we propose the path-degenerate quantum interferometry scheme that obviates the need for entire optical subsystems---including additional filter cavities, auxiliary parametric amplifiers, and Faraday isolators---thereby drastically reducing spatial mode mismatches while inherently integrating variational output, a long-standing theoretical proposal to further deepen the QND regime. We experimentally demonstrate a core aspect of this scheme, achieving a shot-noise-preserving signal enhancement that directly counteracts the detrimental effects of readout loss. By delivering an improved signal-to-quantum-noise ratio solely through the consolidation and reduction of currently considered optical subsystems, our approach offers a highly optimized route toward enhanced quantum-noise reduction in upcoming LIGO upgrades and next-generation gravitational-wave observatories.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.12204",
  "author_total": 5,
  "authors": [
    {
      "name": "Jonas Rittmeyer"
    },
    {
      "name": "Niels Boettner"
    },
    {
      "name": "Farid Khalili"
    },
    {
      "name": "Mikhail Korobko"
    },
    {
      "name": "Roman Schnabel"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ec3dazzgrect7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.12204",
  "fulltext_url": null,
  "id": "ec3dazzgrect7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.12204",
  "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",
      "astro-ph.IM"
    ],
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3103|Pulsars and Gravitational Waves Research"
    ]
  ],
  "openalex": "W7212837333",
  "pdf_url": "https://arxiv.org/pdf/2609.12204",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ec3dazzgrect7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2609.12204",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.12204"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.IM",
      "subfield": "instrumentation-methods"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Path-Degenerate Quantum Interferometry for Loss Resilience in Gravitational-Wave Detectors",
  "title_text": "Path-Degenerate Quantum Interferometry for Loss Resilience in Gravitational-Wave Detectors",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/ec3dazzgrect7",
  "venue": "arXiv",
  "versions": []
}