{
  "abstract": "Under Gaussian collective dephasing parallel to the signal, the superdecoherence of an $N$-atom Greenberger--Horne--Zeilinger (GHZ) state cancels its gain in Fisher information, so GHZ frequency sensitivity is limited to an atom-number-independent floor. We demonstrate that this floor is a property of Gaussian diffusion: a single common phase kick can at most randomize the phase of an $N$-atom coherence, so discrete events at rate $Γ$ cannot dephase any coherence order faster than $2Γ$. At the same single-atom coherence time, finite-rate Poisson kicks with an absolutely continuous amplitude law therefore saturate the order-$N$ decay rate and restore Heisenberg scaling. We prove that Gaussian diffusion is the worst case for GHZ and Dicke-cat probes under this calibration, that only the Brownian component of Lévy phase noise sets the asymptotic floor, and that the $1/N$ exponent is optimal for parallel Ramsey protocols. These results identify the counting statistics of the common noise, rather than its spectrum, as the property that bounds superdecoherence.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.02962",
  "author_total": 5,
  "authors": [
    {
      "name": "Yizhe Zhou"
    },
    {
      "name": "Xusheng Lei"
    },
    {
      "name": "Xing Heng"
    },
    {
      "name": "Zuoxian Wang"
    },
    {
      "name": "Danyue Ma"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/677cbvm3j3thx.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.02962",
  "fulltext_url": null,
  "id": "677cbvm3j3thx",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.02962",
  "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",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7167593170",
  "pdf_url": "https://arxiv.org/pdf/2607.02962",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-12",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/677cbvm3j3thx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2607.02962",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.02962"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Entanglement Drives Common Noise into the Strong-Coupling Regime",
  "title_text": "Entanglement Drives Common Noise into the Strong-Coupling Regime",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/677cbvm3j3thx",
  "venue": "arXiv",
  "versions": []
}