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

Published

May 25, 2023

Author(s)

Maxime Malnou, John Mates, Michael Vissers, Leila R. Vale, Dan Schmidt, Douglas Bennett, JIANSONG GAO, Joel Ullom

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

Pub Type

Journals

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Keywords

parametric amplifier, microwave multiplexer, sensor readout

Citation

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 December 11, 2024)