{
  "abstract": "Non-Markovian open quantum networks are among the most challenging problems in quantum theory, as they suffer from both, the exponentially scaling many-body state space as well as long memory times when the sites are strongly coupled to structured environments. Recent efforts to address them by combining tensor networks with real-time path integrals, such as TEMPO and process tensors, were however limited to systems with rather weak system-environment couplings because strong couplings lead to large bond dimensions. Here, we devise a tensor network scheme (CTEMPO) resulting in particularly small bond dimensions for single-site problems. We then extend this to a practical scheme to simulate non-Markovian quantum networks by time-evolving a corresponding comb tensor network. Benchmarking the single-site algorithm on the spin-boson model we find orders-of-magnitude improvement over established methods. The multi-site algorithm is shown to solve the notoriously difficult problem of the 7-site Fenna-Matthews-Olson photosynthetic complex, whose spectral density contains 62 peaks. We then apply our approach to explore the scaling behavior of the superradiance of up to $N=20$ quantum dots individually coupled to super-Ohmic phonon baths. Our approach provides a turnkey solution to non-Markovian quantum networks and is compatible with more general tensor network topologies.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.10259",
  "author_total": 2,
  "authors": [
    {
      "name": "Quentin W. Richter"
    },
    {
      "name": "Moritz Cygorek"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ctb6an6w6mbk8.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.10259",
  "fulltext_url": null,
  "id": "ctb6an6w6mbk8",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.10259",
  "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|Quantum many-body systems"
    ]
  ],
  "openalex": "W7220993399",
  "pdf_url": "https://arxiv.org/pdf/2610.10259",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ctb6an6w6mbk8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:37Z",
      "native_id": "2610.10259",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.10259"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Numerically exact simulation of open quantum networks with strong system-bath couplings using tensor network path integrals",
  "title_text": "Numerically exact simulation of open quantum networks with strong system-bath couplings using tensor network path integrals",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:37Z",
  "url": "https://research.draconitic.com/paper/ctb6an6w6mbk8",
  "venue": "arXiv",
  "versions": []
}