{
  "abstract": "In single-port non-Hermitian sensors the Petermann factor offsets susceptibility gains, imposing a strict resource bound on metrological precision. We test whether a multi-port geometry can evade this bound: a double-chain optomechanical ladder with opposing non-reciprocal hoppings spatially separates signal amplification from quantum-noise drainage, and gradient-based differentiable optimal control (DOC) maximizes the resource-normalized Fisher information $\\Fnorm$ subject to a Hurwitz-stability constraint. Across system sizes $N\\in\\{\\num{6},\\dots,\\num{16}\\}$ the optimizer returns $\\Fnorm>0$ in every case, with two coexisting solution classes whose selection is initialization-dependent: deep-stability configurations achieve $\\Fnorm\\in\\numrange{0.937}{0.987}$ with attenuated transmission, while marginal-stability configurations deliver directional gain $\\Gfwd\\in\\qtyrange{13.5}{15.5}{\\dB}$ with isolation $\\Iso\\in\\qtyrange{40}{64}{\\dB}$. A multi-restart ensemble reveals these classes are the endpoints of a precision--gain frontier. All solutions remain Hurwitz-stable under \\qty{5}{\\percent} disorder (\\qty{87.5}{\\percent} recovery), and the deep-stability advantage survives realistic preamplifier noise at $\\Fnormeff\\approx\\num{0.3}$--$\\num{0.5}$. Mapped onto circuit-QED parameters, the architecture enables sub-attonewton force sensing and broadband axion searches across the \\qtyrange{1}{10}{\\giga\\hertz} band.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.04492",
  "author_total": 6,
  "authors": [
    {
      "name": "Juste Deuyekbe"
    },
    {
      "name": "Philippe Djorwé"
    },
    {
      "name": "A. -H. Abdel-Aty"
    },
    {
      "name": "A. Elrashidi"
    },
    {
      "name": "Nsangou Mama"
    },
    {
      "name": "Serge Guy Nana Engo"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bhxqtwr2nw2jp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.04492",
  "fulltext_url": null,
  "id": "bhxqtwr2nw2jp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.04492",
  "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",
      "quant-ph"
    ],
    [
      "openalex",
      "3107|Mechanical and Optical Resonators"
    ]
  ],
  "openalex": "W7211865460",
  "pdf_url": "https://arxiv.org/pdf/2609.04492",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bhxqtwr2nw2jp.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:14Z",
      "native_id": "2609.04492",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.04492"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Gradient-based optimal control of the non-Hermitian skin effect in optomechanical arrays",
  "title_text": "Gradient-based optimal control of the non-Hermitian skin effect in optomechanical arrays",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:14Z",
  "url": "https://research.draconitic.com/paper/bhxqtwr2nw2jp",
  "venue": "arXiv",
  "versions": []
}