A microwave SQUID multiplexer optimized for bolometric applications
- 8 February 2021
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 118 (6), 062601
- https://doi.org/10.1063/5.0033416
Abstract
A microwave superconducting quantum interference device multiplexer 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/ , 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%.
Funding Information
- U.S. Department of Energy (DE-AC02-76SF00515)
- National Institute of Standards and Technology (IMS)
- National Aeronautics and Space Administration (APRA)
- Simons Foundation
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