{
  "abstract": "Long term operation of semiconductor spin qubits requires active stabilization of quantum dot potentials against low-frequency charge noise. To address this, we demonstrate a gradient-descent feedback approach in a silicon double quantum dot device using high-bandwidth radio-frequency (rf) reflectometry readout and a field-programmable gate array (FPGA) for digital signal processing. This architecture enables continuous multi-parameter gradient calculation and quick gate voltage updates, significantly increasing the effective feedback bandwidth compared to previous methods relying on slow direct-current transport measurements. By operating with 8 steps per feedback cycle and an integration time of 25.6 $μ$s, this high-speed stabilization scheme maintains better than -6 dB of noise suppression up to 5 kHz, achieving an attenuation of $-7.4 \\pm 0.2$ dB at the maximum measured frequency. This effectively suppresses low-frequency 1/f noise, maintaining device stability over longer time periods, and potentially enables real-time control in large-scale quantum dot arrays.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.10325",
  "author_total": 3,
  "authors": [
    {
      "name": "Johnathan Bryan"
    },
    {
      "name": "Tim J. Wilson"
    },
    {
      "name": "Hong-Wen Jiang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ft7840v0r64sg.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.10325",
  "fulltext_url": null,
  "id": "ft7840v0r64sg",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.10325",
  "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",
      "cond-mat.mes-hall"
    ],
    [
      "openalex",
      "3107|Quantum and electron transport phenomena"
    ]
  ],
  "openalex": "W7202249503",
  "pdf_url": "https://arxiv.org/pdf/2608.10325",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ft7840v0r64sg.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:35:35Z",
      "native_id": "2608.10325",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.10325"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Real-Time FPGA-Based Multi-Parameter Feedback Stabilization of a Silicon Double Quantum Dot",
  "title_text": "Real-Time FPGA-Based Multi-Parameter Feedback Stabilization of a Silicon Double Quantum Dot",
  "type": "preprint",
  "updated_at": "2026-10-30T12:35:35Z",
  "url": "https://research.draconitic.com/paper/ft7840v0r64sg",
  "venue": "arXiv",
  "versions": []
}