Characterization of Aluminum Microwave SQUID Multiplexers for CEνNS Detection

@misc{amidei2026characterization,
  title = {{Characterization of Aluminum Microwave SQUID Multiplexers for CE$ν$NS Detection}},
  author = {James Amidei and Antoine Armatol and Corinne Augier and Louis Bailly-Salins and Guillaume Baulieu and Laurent Bergé and Julien Billard and Juliette Blé and Gaby Brenot and Guillaume Bres and Jean-Louis Bret and Alexandre Broniatowski and Martino Calvo and Antonella Cavanna and Antoine Cazes and Emanuela Celi and David Chaize and Mohammed Chala and Maurice Chapellier and Luke Chaplinsky and Ran Chen and Ion Cojocari and Jules Colas and Laurent Couraud and Elspeth Cudmore and Maryvonne De Jesus and Pierre de Marcillac and Nicole Dombrowski and Louis Dumoulin and Alan Durnez and Romain Faure and Sylvain Ferriol and Enectali Figueroa-Feliciano and Joseph A. Formaggio and Stephane Fuard and Jules Gascon and Cloé Girard-Carillo and Andrea Giuliani and Corinne Goy and Cyrille Guerin and Leïla Haegel and Patrick M. Harrington and Scott A. Hertel and Cyrus F. Hirjibehedin and Christophe Hoarau and Ziqing Hong and Daemon Howard and Jean-Christophe Ianigro and Yong Jin and Alexandre Juillard and Dimitar Karaivanov and Temirlan Khussainov and Andrew Kubik and Jacob Lamblin and Tatiana Le Bellec and Laetitia Leroy and Mingyu Li and Alexey Lubashevskiy and Stefanos Marnieros and Romain Martin},
  howpublished = {arXiv},
  year = {2026},
  month = may,
  doi = {10.48550/arxiv.2605.24272},
  eprint = {2605.24272},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.24272},
  note = {CC BY-NC-ND 4.0},
}

TY  - UNPB
TI  - Characterization of Aluminum Microwave SQUID Multiplexers for CEνNS Detection
AU  - James Amidei
AU  - Antoine Armatol
AU  - Corinne Augier
AU  - Louis Bailly-Salins
AU  - Guillaume Baulieu
AU  - Laurent Bergé
AU  - Julien Billard
AU  - Juliette Blé
AU  - Gaby Brenot
AU  - Guillaume Bres
AU  - Jean-Louis Bret
AU  - Alexandre Broniatowski
AU  - Martino Calvo
AU  - Antonella Cavanna
AU  - Antoine Cazes
AU  - Emanuela Celi
AU  - David Chaize
AU  - Mohammed Chala
AU  - Maurice Chapellier
AU  - Luke Chaplinsky
AU  - Ran Chen
AU  - Ion Cojocari
AU  - Jules Colas
AU  - Laurent Couraud
AU  - Elspeth Cudmore
AU  - Maryvonne De Jesus
AU  - Pierre de Marcillac
AU  - Nicole Dombrowski
AU  - Louis Dumoulin
AU  - Alan Durnez
AU  - Romain Faure
AU  - Sylvain Ferriol
AU  - Enectali Figueroa-Feliciano
AU  - Joseph A. Formaggio
AU  - Stephane Fuard
AU  - Jules Gascon
AU  - Cloé Girard-Carillo
AU  - Andrea Giuliani
AU  - Corinne Goy
AU  - Cyrille Guerin
AU  - Leïla Haegel
AU  - Patrick M. Harrington
AU  - Scott A. Hertel
AU  - Cyrus F. Hirjibehedin
AU  - Christophe Hoarau
AU  - Ziqing Hong
AU  - Daemon Howard
AU  - Jean-Christophe Ianigro
AU  - Yong Jin
AU  - Alexandre Juillard
AU  - Dimitar Karaivanov
AU  - Temirlan Khussainov
AU  - Andrew Kubik
AU  - Jacob Lamblin
AU  - Tatiana Le Bellec
AU  - Laetitia Leroy
AU  - Mingyu Li
AU  - Alexey Lubashevskiy
AU  - Stefanos Marnieros
AU  - Romain Martin
PY  - 2026
DA  - 2026/05/22
PB  - arXiv
DO  - 10.48550/arxiv.2605.24272
UR  - https://arxiv.org/abs/2605.24272
AB  - We present the design, fabrication, and characterization of an aluminum-based six-channel microwave SQUID multiplexer (μMUX) 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/√(Hz). With flux-ramp modulation, low-frequency 1/f noise is suppressed, and the flux sensitivity is around 3-4 μΦ_0/√(Hz), corresponding to a current sensitivity of 24-33 pA/√(Hz) at the input coil. We further demonstrate a reduction in readout noise by incorporating a Josephson traveling-wave parametric amplifier (JTWPA) between the μMUX and the HEMT. This achieves an open-loop flux sensitivity of 0.3-0.6 μΦ_0/√(Hz) and an effective system noise temperature below 1 K. These results establish aluminum μMUX devices as a viable and extensible readout technology for low-noise cryogenic detector arrays.
ER  -