{
  "abstract": "Reservoir computing requires not only long memory, but also memory distributed over the timescales relevant to a given task. In most quantum reservoir computing architectures, however, the memory profile emerges from intrinsic dynamics and cannot be directly engineered. Here we introduce a waveguide-QED quantum reservoir in which coherent memory return is controlled by the coupling geometry. The reservoir consists of a driven Kerr-nonlinear resonator coupled to a one-dimensional waveguide at spatially separated points. An unmeasured propagating field carries information about past inputs and coherently returns it to the resonator after a finite propagation time, forming a non-Markovian feedback channel without intermediate measurement or classical reinjection. Delay-resolved memory benchmarks reveal two complementary functions: waveguide propagation determines when past information returns, whereas Kerr dynamics convert the returned field into nonlinear temporal features accessible through a linear readout. NARMA-$n$ prediction shows that the optimal feedback delay shifts systematically with task order and approximately tracks the explicit input-product lag. These results establish coherent delayed feedback as a mechanism for engineering task-relevant memory in quantum reservoir computing.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.27072",
  "author_total": 5,
  "authors": [
    {
      "name": "Hong Jiang"
    },
    {
      "name": "Yu Wu"
    },
    {
      "name": "Yue Ban"
    },
    {
      "name": "Xi Chen"
    },
    {
      "name": "Juan José García-Ripoll"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dvsendacz6esg.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.27072",
  "fulltext_url": null,
  "id": "dvsendacz6esg",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.27072",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2609.27072",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dvsendacz6esg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:56Z",
      "native_id": "2609.27072",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.27072"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Programmable Coherent Memory Kernels for Quantum Reservoir Computing in Waveguide QED",
  "title_text": "Programmable Coherent Memory Kernels for Quantum Reservoir Computing in Waveguide QED",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:56Z",
  "url": "https://research.draconitic.com/paper/dvsendacz6esg",
  "venue": "arXiv",
  "versions": []
}