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

被引：6

作者：

Malnou, M. ^{[1
,2
]}

Mates, J. A. B. ^{[1
]}

Vissers, M. R. ^{[1
]}

Vale, L. R. ^{[1
]}

Schmidt, D. R. ^{[1
]}

Bennett, D. A. ^{[1
]}

Gao, J. ^{[1
,2
]}

Ullom, J. N. ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Boulder, CO 80305 USA

[2] Univ Colorado, Dept Phys, Boulder, CO 80309 USA

来源：

APPLIED PHYSICS LETTERS | 2023年 / 122卷 / 21期

基金：

美国国家航空航天局;

关键词：

PERFORMANCE; NOISE;

D O I：

10.1063/5.0149646

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 (lmux). This lmux 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) /root Hz with the KITWPA off to 0.77 mu phi(0) /root Hzp with the KITWPA on. When statically biasing the lmux to the maximally flux-sensitive point, the flux noise drops from 0.45 mu phi(0) /root Hz to 0.2 mu phi(0) /root Hz. We validate this new readout scheme by coupling a transition-edge sensor microcalorimeter to the lmux and detecting background radiation. The combination of lmux and KITWPA provides a variety of new capabilities including improved detector sensitivity and more efficient bandwidth utilization.

引用

页数：5

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