Malnou, M.
, Mates, J.
, Vissers, M.
, Vale, L.
, Schmidt, D.
, Bennett, D.
, Gao, J.
and Ullom, J.
(2023),
Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier, Applied Physics Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=936356
(Accessed October 14, 2025)
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Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier
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, , , , , , JIANSONG GAO,
Abstract
We report on the use of a kinetic-inductance traveling-wave parametric amplifier (KITWPA) as the first amplifier in the readout chain of a microwave superconducting quantum interference device (SQUID) multiplexer (\umux). This \umux} is designed to multiplex signals from arrays of low temperature detectors such as superconducting transition-edge microcalorimeters. When modulated with a periodic flux-ramp to linearize the SQUID response, the flux noise improves, on average, from $1.6$\,\microphinotrthz} with the KITWPA off, to $0.77$\,\microphinotrthz} with the KITWPA on. When statically biasing the \umux} to the maximally flux-sensitive point, the flux noise drops from $0.45$\,\microphinotrthz} to $0.2$\,\microphinotrthz. We validate this new readout scheme by coupling a transition-edge microcalorimeter to the \umux} and detecting background radiation. The combination of \umux} and KITWPAs provides a variety of new capabilities including improved detector sensitivity and more efficient bandwidth utilization.Citation
Applied Physics Letters
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Journals
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Keywords
parametric amplifier, microwave multiplexer, sensor readout
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Created May 25, 2023, Updated May 26, 2023