Improved microwave SQUID multiplexer readout using a kinetic-inductance traveling-wave parametric amplifier
Maxime Malnou, John Mates, Michael Vissers, Leila R. Vale, Dan Schmidt, Douglas Bennett, JIANSONG GAO, Joel Ullom
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.
, Mates, J.
, Vissers, M.
, Vale, L.
, Schmidt, D.
, Bennett, D.
, Gao, J.
and Ullom, J.
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 September 27, 2023)