{
  "abstract": "We show that the equilibrium connected correlation of the two-body loss rate provides access to the dynamical bulk viscosity in weakly dissipative quantum gases. Starting from the Lindblad equation for weak inelastic losses, we derive the loss-current operator and, using a counting-field formulation of the loss statistics, the relation between the statistics of detected losses and the equilibrium loss-rate correlator. The connected correlation of the two-body loss rate is found to be proportional to the equilibrium contact correlation and hence to the bulk-viscosity spectrum. We show that the measured loss-counting covariance contains, besides the Poissonian self-correlation, a quantum-jump backaction term of the same order as the target correlator, which is fixed by the transient of the mean loss rate after the loss is switched on. The bulk-viscosity spectrum can therefore be reconstructed from the combination of the loss-counting covariance and the mean loss dynamics. Our result identifies weak two-body loss dynamics as a probe of dynamical bulk viscosity, whose measurement has remained elusive in experiments.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.01835",
  "author_total": 3,
  "authors": [
    {
      "name": "Tingyu Zhang"
    },
    {
      "name": "Hiroyuki Tajima"
    },
    {
      "name": "Takeo Kato"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2pzngy540sakv.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.01835",
  "fulltext_url": null,
  "id": "2pzngy540sakv",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.01835",
  "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",
      "cond-mat.quant-gas"
    ],
    [
      "arxiv",
      "physics.atom-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2606.01835",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-11",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2pzngy540sakv.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:30:32Z",
      "native_id": "2606.01835",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.01835"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.quant-gas",
      "subfield": "amo"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.quant-gas",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Two-body loss dynamics as a probe of dynamical bulk viscosity in ultracold atomic gases",
  "title_text": "Two-body loss dynamics as a probe of dynamical bulk viscosity in ultracold atomic gases",
  "type": "preprint",
  "updated_at": "2026-10-30T12:33:28Z",
  "url": "https://research.draconitic.com/paper/2pzngy540sakv",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/x45r-b3xv",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}