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

• URL: http://arxiv.org/abs/2303.04181v1
• Date: Tue, 7 Mar 2023 19:06:35 GMT
• Title: Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier
• Authors: M. Malnou, J. A. B. Mates, M. R. Vissers, L. R. Vale, D. R. Schmidt, D. A. Bennett, J. Gao, J. N. Ullom
• Abstract summary: 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.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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 $1.6$ $\mu\Phi_0/\sqrt{\mathrm{Hz}}$ with the KITWPA off, to $0.77$ $\mu\Phi_0/\sqrt{\mathrm{Hz}}$ with the KITWPA on. When statically biasing the umux to the maximally flux-sensitive point, the flux noise drops from $0.45$ $\mu\Phi_0/\sqrt{\mathrm{Hz}}$ to $0.2$ $\mu\Phi_0/\sqrt{\mathrm{Hz}}$. 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.

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