{
  "abstract": "The pursuit of high-resolution eigenspectroscopy on noisy intermediate-scale quantum devices is often hindered by the trade-off between circuit depth and coherence time. In this work, we introduce and experimentally demonstrate a dynamical eigenspectroscopy protocol that extracts fine-grained energy structures from time-dependent survival amplitudes. To overcome the finite coherence window of current superconducting processors, we employ Variational Trotter Compression (VTC) as a practical means to extend the duration of high-fidelity unitary evolution. Using a multi-connected 9-qubit superconducting processor, we reconstruct the time-domain autocorrelation signal via quantum state tomography for the H2 molecule at different bond lengths and for the Fermi-Hubbard model across different correlation regimes. Through multi-frequency fitting and Fourier analysis, the extracted eigenenergies agree with the exact-diagonalization values to within 2x10^-3, including the near-degenerate levels in the strongly interacting regime. Our results establish experimental dynamical spectroscopy as a robust and generalizable framework for simulating both quantum chemistry and strongly correlated lattice systems, bridging weak- and strong-coupling regimes on near-term quantum hardware.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.05838",
  "author_total": 13,
  "authors": [
    {
      "name": "Liyang Sui"
    },
    {
      "name": "Xingrui Liu"
    },
    {
      "name": "Yufan Li"
    },
    {
      "name": "Sainan Huai"
    },
    {
      "name": "Zhiwen Zong"
    },
    {
      "name": "Kunliang Bu"
    },
    {
      "name": "Xiaopei Yang"
    },
    {
      "name": "Wenyan Jin"
    },
    {
      "name": "Bowen Chen"
    },
    {
      "name": "Xutao Zhang"
    },
    {
      "name": "Jianlan Wu"
    },
    {
      "name": "Shengyu Zhang"
    },
    {
      "name": "Yi Yin"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cd6ay2wd9x2hn.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.05838",
  "fulltext_url": null,
  "id": "cd6ay2wd9x2hn",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.05838",
  "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",
      "1702|Quantum Computing Algorithms and Architecture"
    ]
  ],
  "openalex": "W7212041307",
  "pdf_url": "https://arxiv.org/pdf/2609.05838",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-05",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cd6ay2wd9x2hn.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:48Z",
      "native_id": "2609.05838",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.05838"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "High-Resolution Dynamical Eigenspectroscopy via Variational Trotter Compression on a Superconducting Qubit Processor",
  "title_text": "High-Resolution Dynamical Eigenspectroscopy via Variational Trotter Compression on a Superconducting Qubit Processor",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:48Z",
  "url": "https://research.draconitic.com/paper/cd6ay2wd9x2hn",
  "venue": "arXiv",
  "versions": []
}