{
  "abstract": "We investigate a finite-time quantum-battery charging architecture in which a driven two-level working system transfers nonequilibrium resources to an interacting two-qubit battery through a weakly anharmonic three-level mediator. Finite-time driving generates coherence and ergotropy, while excitation-number conservation organizes the transfer into distinct dynamical sectors. The mediator then provides spectrally selective charging channels: its lower transition enables nearly complete single-excitation transfer with negligible residual mediator energy, whereas initial mediator loading activates a cross-matched resonant two-excitation cascade toward the doubly excited battery state. In the latter sector, the mediator anharmonicity compensates the interaction-induced non-equidistance of the battery spectrum, enabling simultaneous resonance of the two transfer channels. At exact double resonance, unequal collective matrix elements impose the analytical bound $P_{\\rm max}=8/9$; unit transfer is recovered under the impedance-matching condition $|G_1|=|G_2|$, as confirmed numerically. Detuning scans quantify the spectral tolerance, and the full mixed-state dynamics reveals distinct energy- and ergotropy-transfer profiles. Finite-time compression, thermal reset, and switching work close the cycle-level energy balance to numerical precision. The resulting framework combines nonequilibrium resource generation, spectral matching, impedance matching, and coherent multilevel charging, and provides a basis for extending these principles to collective and many-body quantum batteries.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.39393",
  "author_total": 4,
  "authors": [
    {
      "name": "Sujay Mondal"
    },
    {
      "name": "Anumita Mukhopadhyay"
    },
    {
      "name": "Siddhartha Dutta"
    },
    {
      "name": "Abhijit Bandyopadhyay"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3t850f71kqm3y.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.39393",
  "fulltext_url": null,
  "id": "3t850f71kqm3y",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.39393",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3109|Advanced Thermodynamics and Statistical Mechanics"
    ]
  ],
  "openalex": "W7215086898",
  "pdf_url": "https://arxiv.org/pdf/2609.39393",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3t850f71kqm3y.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:22Z",
      "native_id": "2609.39393",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.39393"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Spectral and Impedance Matching for Multi-excitation Charging of an Interacting Quantum Battery via an Anharmonic Mediator",
  "title_text": "Spectral and Impedance Matching for Multi-excitation Charging of an Interacting Quantum Battery via an Anharmonic Mediator",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:44Z",
  "url": "https://research.draconitic.com/paper/3t850f71kqm3y",
  "venue": "arXiv",
  "versions": []
}