Adjustable SQUID-resonator direct coupling in microwave SQUID multiplexer for TES microcalorimeter array

Yuki Nakashima; Fuminori Hirayama; Satoshi Kohjiro; Hirotake Yamamori; Shuichi Nagasawa; Noriko Y. Yamasaki; Kazuhisa Mitsuda

doi:10.1587/elex.14.20170271

LETTER

Adjustable SQUID-resonator direct coupling in microwave SQUID multiplexer for TES microcalorimeter array

Yuki Nakashima, Fuminori Hirayama, Satoshi Kohjiro, Hirotake Yamamori, Shuichi Nagasawa, Noriko Y. Yamasaki, Kazuhisa Mitsuda

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Keywords: microwave SQUID multiplexer, SQUID readout, microwave resonators, superconducting transition edge sensors (TES), microcalorimeters

JOURNAL FREE ACCESS

2017 Volume 14 Issue 11 Pages 20170271

DOI https://doi.org/10.1587/elex.14.20170271

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Abstract

We have succeeded in the first demonstration of a simple and accurate resonator-superconducting quantum interference device (SQUID) coupling for microwave SQUID multiplexers. A simple theory shows our direct coupling with adjustable fractional inductance in the SQUID loop can decrease the deviation of resonance frequencies from designed values in contrast to a conventional inductive coupling. Our direct coupling provides the individual coupling that can be optimized with keeping identical structure, shape, and dimension of the SQUID among all pixels on the same chip. It covers experimentally three or potentially more factors of a frequency band that is larger than that of cryogenic high electron mobility transistor amplifiers. The deviation of experimental fractional inductance from the designed one is less than −3/+10%.

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