{
  "abstract": "We present the design, fabrication, and characterization of an aluminum-based six-channel microwave SQUID multiplexer ($μ$MUX) prototype for transition-edge sensor (TES) readout in the RICOCHET experiment. The device consists of aluminum coplanar-waveguide resonators and RF SQUIDs with Dolan-style Al/AlO$_x$/Al Josephson junctions. By measuring the resonator scattering parameters at a range of probe tone frequencies, powers, and flux bias points, we demonstrate agreement between the device response and existing multiplexer models. We also characterize the noise performance in both open-loop and flux-ramping modes. With a high electron mobility transistor (HEMT) amplifier, open-loop measurements yield a flux sensitivity of 1-1.5 $μΦ_0/\\sqrt{Hz}$. With flux-ramp modulation, low-frequency 1/f noise is suppressed, and the flux sensitivity is around 3-4 $μΦ_0/\\sqrt{Hz}$, corresponding to a current sensitivity of 24-33 $pA/\\sqrt{Hz}$ at the input coil. We further demonstrate a reduction in readout noise by incorporating a Josephson traveling-wave parametric amplifier (JTWPA) between the $μ$MUX and the HEMT. This achieves an open-loop flux sensitivity of 0.3-0.6 $μΦ_0/\\sqrt{Hz}$ and an effective system noise temperature below 1 K. These results establish aluminum $μ$MUX devices as a viable and extensible readout technology for low-noise cryogenic detector arrays.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2605.24272",
  "author_total": 95,
  "authors": [
    {
      "name": "James Amidei"
    },
    {
      "name": "Antoine Armatol"
    },
    {
      "name": "Corinne Augier"
    },
    {
      "name": "Louis Bailly-Salins"
    },
    {
      "name": "Guillaume Baulieu"
    },
    {
      "name": "Laurent Bergé"
    },
    {
      "name": "Julien Billard"
    },
    {
      "name": "Juliette Blé"
    },
    {
      "name": "Gaby Brenot"
    },
    {
      "name": "Guillaume Bres"
    },
    {
      "name": "Jean-Louis Bret"
    },
    {
      "name": "Alexandre Broniatowski"
    },
    {
      "name": "Martino Calvo"
    },
    {
      "name": "Antonella Cavanna"
    },
    {
      "name": "Antoine Cazes"
    },
    {
      "name": "Emanuela Celi"
    },
    {
      "name": "David Chaize"
    },
    {
      "name": "Mohammed Chala"
    },
    {
      "name": "Maurice Chapellier"
    },
    {
      "name": "Luke Chaplinsky"
    },
    {
      "name": "Ran Chen"
    },
    {
      "name": "Ion Cojocari"
    },
    {
      "name": "Jules Colas"
    },
    {
      "name": "Laurent Couraud"
    },
    {
      "name": "Elspeth Cudmore"
    },
    {
      "name": "Maryvonne De Jesus"
    },
    {
      "name": "Pierre de Marcillac"
    },
    {
      "name": "Nicole Dombrowski"
    },
    {
      "name": "Louis Dumoulin"
    },
    {
      "name": "Alan Durnez"
    },
    {
      "name": "Romain Faure"
    },
    {
      "name": "Sylvain Ferriol"
    },
    {
      "name": "Enectali Figueroa-Feliciano"
    },
    {
      "name": "Joseph A. Formaggio"
    },
    {
      "name": "Stephane Fuard"
    },
    {
      "name": "Jules Gascon"
    },
    {
      "name": "Cloé Girard-Carillo"
    },
    {
      "name": "Andrea Giuliani"
    },
    {
      "name": "Corinne Goy"
    },
    {
      "name": "Cyrille Guerin"
    },
    {
      "name": "Leïla Haegel"
    },
    {
      "name": "Patrick M. Harrington"
    },
    {
      "name": "Scott A. Hertel"
    },
    {
      "name": "Cyrus F. Hirjibehedin"
    },
    {
      "name": "Christophe Hoarau"
    },
    {
      "name": "Ziqing Hong"
    },
    {
      "name": "Daemon Howard"
    },
    {
      "name": "Jean-Christophe Ianigro"
    },
    {
      "name": "Yong Jin"
    },
    {
      "name": "Alexandre Juillard"
    },
    {
      "name": "Dimitar Karaivanov"
    },
    {
      "name": "Temirlan Khussainov"
    },
    {
      "name": "Andrew Kubik"
    },
    {
      "name": "Jacob Lamblin"
    },
    {
      "name": "Tatiana Le Bellec"
    },
    {
      "name": "Laetitia Leroy"
    },
    {
      "name": "Mingyu Li"
    },
    {
      "name": "Alexey Lubashevskiy"
    },
    {
      "name": "Stefanos Marnieros"
    },
    {
      "name": "Romain Martin"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1dr9hs6mqhbm5.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.24272",
  "fulltext_url": null,
  "id": "1dr9hs6mqhbm5",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.24272",
  "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",
      "hep-ex"
    ],
    [
      "arxiv",
      "physics.ins-det"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2605.24272",
  "pmcid": null,
  "pmid": null,
  "published": "2026-05-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1dr9hs6mqhbm5.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:53Z",
      "native_id": "2605.24272",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.24272"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:physics.ins-det",
      "subfield": "applied-instrumentation"
    },
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    }
  ],
  "title": "Characterization of Aluminum Microwave SQUID Multiplexers for CE$ν$NS Detection",
  "title_text": "Characterization of Aluminum Microwave SQUID Multiplexers for CEνNS Detection",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:53Z",
  "url": "https://research.draconitic.com/paper/1dr9hs6mqhbm5",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1088/1361-6668/aeaa8f",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}