A microwave SQUID multiplexer optimized for bolometric applications

Dober, B.; Ahmed, Z.; Arnold, K.; Becker, D. T.; Bennett, D. A.; Connors, J. A.; Cukierman, A.; D'Ewart, J. M.; Duff, S. M.; Dusatko, J. E.; Frisch, J. C.; Gard, J. D.; Henderson, S. W.; Herbst, R.; Hilton, G. C.; Hubmayr, J.; Li, Y.; Mates, J. B.; McCarrick, H.; Reintsema, C. D.; Silva-Feaver, M.; Ruckman, L.; Ullom, J. N.; Vale, L. R.; Van Winkle, D. D.; Vasquez, J.; Wang, Y.; Young, E.; Yu, C.; Zheng, K.

doi:10.1063/5.0033416

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A microwave SQUID multiplexer optimized for bolometric applications

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Abstract

A microwave SQUID (superconducting quantum interference device) has been optimized for reading out large arrays of superconducting transition-edge sensor (TES) bolometers. We present the scalable cryogenic multiplexer chip design that may be used to construct an 1820-channel multiplexer for the 4-8 GHz rf band. The key metrics of yield, sensitivity, and crosstalk are determined through measurements of 455 readout channels, which span 4-5 GHz. The median white-noise level is 45 pA/ $\sqrt{Hz}$, evaluated at 2 Hz, with a 1/f knee ≤ 20 mHz after common-mode subtraction. The white-noise level decreases the sensitivity of a TES bolometer optimized for detection of the cosmic microwave background at 150 GHz by only 3%. The measured crosstalk between any channel pair is ≤ 0.3%.

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Dober, B., Ahmed, Z., Arnold, K., Becker, D. T., Bennett, D. A., Connors, J. A., Cukierman, A., D'Ewart, J. M., Duff, S. M., Dusatko, J. E., Frisch, J. C., Gard, J. D., Henderson, S. W., Herbst, R., Hilton, G. C., Hubmayr, J., Li, Y., Mates, J. B., McCarrick, H., Reintsema, C. D., Silva-Feaver, M., Ruckman, L., Ullom, J. N., Vale, L. R., Van Winkle, D. D., Vasquez, J., Wang, Y., Young, E., Yu, C., Zheng, K.. 2021-02-08. A microwave SQUID multiplexer optimized for bolometric applications. https://doi.org/10.1063/5.0033416

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