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W4378216624 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 sensor microcalorimeters. When modulated with a periodic flux-ramp to linearize the SQUID response, the flux noise improves, on average, from $1.6$ $muPhi_0/sqrt{mathrm{Hz}}$ with the KITWPA off, to $0.77$ $muPhi_0/sqrt{mathrm{Hz}}$ with the KITWPA on. When statically biasing the umux to the maximally flux-sensitive point, the flux noise drops from $0.45$ $muPhi_0/sqrt{mathrm{Hz}}$ to $0.2$ $muPhi_0/sqrt{mathrm{Hz}}$. We validate this new readout scheme by coupling a transition-edge sensor microcalorimeter to the umux and detecting background radiation. The combination of umux and KITWPA provides a variety of new capabilities including improved detector sensitivity and more efficient bandwidth utilization." @default.
W4378216624 created "2023-05-26" @default.
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W4378216624 date "2023-05-22" @default.
W4378216624 modified "2023-09-27" @default.
W4378216624 title "Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier" @default.
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W4378216624 doi "https://doi.org/10.1063/5.0149646" @default.
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