{
  "abstract": "Continuous quantum displacement measurements are fundamentally limited by a trade-off between readout imprecision and measurement back-action, constrained by the Heisenberg uncertainty principle. In the Laser Interferometric Gravitational-Wave Observatory (LIGO), these two quantum noise components dominate much of the observation band, making it an excellent testbed. We induce a sub-Hz-linewidth optomechanical mode by trapping the differential motion of the 40-kg mirrors in a band where radiation-pressure back-action dominates the motion. Engineering the quantum state entering the dark port creates correlations between imprecision and back-action that partially cancel their contributions, reducing observed motion near resonance by ~47%. A framework resolving the imprecision, back-action, and correlation terms identifies the origin of this suppression. These results demonstrate quantum back-action evasion and quantum reservoir engineering in a macroscopic optomechanical system.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.19317",
  "author_total": 206,
  "authors": [
    {
      "name": "Begüm Kabagöz"
    },
    {
      "name": "Eric Oelker"
    },
    {
      "name": "Dhruva Ganapathy"
    },
    {
      "name": "Nergis Mavalvala"
    },
    {
      "name": "Vivishek Sudhir"
    },
    {
      "name": "Vladimir Bossilkov"
    },
    {
      "name": "Joseph Betzweiser"
    },
    {
      "name": "Valery V. Frolov"
    },
    {
      "name": "Anamaria Effler"
    },
    {
      "name": "Adam Mullavey"
    },
    {
      "name": "Lisa Barsotti"
    },
    {
      "name": "Evan D. Hall"
    },
    {
      "name": "Peter Fritschel"
    },
    {
      "name": "R. Abbott"
    },
    {
      "name": "I. Abouelfettouh"
    },
    {
      "name": "R. X. Adhikari"
    },
    {
      "name": "A. Ananyeva"
    },
    {
      "name": "S. Appert"
    },
    {
      "name": "S. K. Apple"
    },
    {
      "name": "K. Arai"
    },
    {
      "name": "N. Aritomi"
    },
    {
      "name": "S. M. Aston"
    },
    {
      "name": "M. Ball"
    },
    {
      "name": "S. W. Ballmer"
    },
    {
      "name": "D. Barker"
    },
    {
      "name": "B. K. Berger"
    },
    {
      "name": "D. Bhattacharjee"
    },
    {
      "name": "G. Billingsley"
    },
    {
      "name": "S. Biscans"
    },
    {
      "name": "C. D. Blair"
    },
    {
      "name": "N. Bode"
    },
    {
      "name": "E. Bonilla"
    },
    {
      "name": "A. Branch"
    },
    {
      "name": "A. F. Brooks"
    },
    {
      "name": "D. D. Brown"
    },
    {
      "name": "J. Bryant"
    },
    {
      "name": "C. Cahillane"
    },
    {
      "name": "A. Calafat"
    },
    {
      "name": "S. R. Callos"
    },
    {
      "name": "H. Cao"
    },
    {
      "name": "E. Capote"
    },
    {
      "name": "F. Clara"
    },
    {
      "name": "J. Collins"
    },
    {
      "name": "C. M. Compton"
    },
    {
      "name": "G. Connolly"
    },
    {
      "name": "R. Cottingham"
    },
    {
      "name": "D. C. Coyne"
    },
    {
      "name": "R. Crouch"
    },
    {
      "name": "J. Csizmazia"
    },
    {
      "name": "A. Cumming"
    },
    {
      "name": "L. P. Dartez"
    },
    {
      "name": "D. Davis"
    },
    {
      "name": "N. Demos"
    },
    {
      "name": "E. Dohmen"
    },
    {
      "name": "K. L. Dooley"
    },
    {
      "name": "J. C. Driggers"
    },
    {
      "name": "S. E. Dwyer"
    },
    {
      "name": "A. Ejlli"
    },
    {
      "name": "T. Etzel"
    },
    {
      "name": "M. Evans"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fpw6axtg4qsjz.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.19317",
  "fulltext_url": null,
  "id": "fpw6axtg4qsjz",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.19317",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "gr-qc"
    ],
    [
      "arxiv",
      "physics.ins-det"
    ],
    [
      "arxiv",
      "physics.optics"
    ],
    [
      "arxiv",
      "quant-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.19317",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-16",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fpw6axtg4qsjz.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2609.19317",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.19317"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:physics.optics",
      "subfield": "optics-photonics"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Observing and evading quantum back-action on a kilogram-scale oscillator",
  "title_text": "Observing and evading quantum back-action on a kilogram-scale oscillator",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/fpw6axtg4qsjz",
  "venue": "arXiv",
  "versions": []
}