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DOE OSTI · 2417641

Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier

Malnou, Maxime·Mates, J. A. B.·Vissers, M. R.·Vale, L. R.·Schmidt, D. R.·Bennett, D. A.·Gao, J.·Ullom, J. N.
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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 (μmux). This μmux is designed to multiplex signals from arrays of low temperature detectors, such as superconducting transition-edge sensor microcalorimeters. When modulated with a periodic flux-ramp to linearize the SQUID response, the flux noise improves, on average, from 1.6 μ $\Phi$ 0 /$\sqrt{Hz}$ with the KITWPA off to 0.77 μ $\Phi$ 0 /$\sqrt{Hz}$ with the KITWPA on. When statically biasing the μmux to the maximally flux-sensitive point, the flux noise drops from 0.45 μ $\Phi$ 0 /$\sqrt{Hz}$ to 0.2 μ $\Phi$ 0 /$\sqrt{Hz}$⁠. We validate this new readout scheme by coupling a transition-edge sensor microcalorimeter to the μmux and detecting background radiation. In conclusion, the combination of μmux and KITWPA provides a variety of new capabilities including improved detector sensitivity and more efficient bandwidth utilization.

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYAmplifiersBackground radiationCalorimetryLow temperature detectorsMultiplexersPhysicsSensorsSuperconducting quantum interference device

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Malnou, Maxime, Mates, J. A. B., Vissers, M. R., Vale, L. R., Schmidt, D. R., Bennett, D. A., Gao, J., Ullom, J. N.. 2023-05-25. Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier. https://doi.org/10.1063/5.0149646

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