Crosstalk in microwave SQUID multiplexers

Published

November 15, 2019

Author(s)

John A. Mates, Daniel T. Becker, Douglas A. Bennett, Bradley J. Dober, Johnathon D. Gard, Gene C. Hilton, Daniel S. Swetz, Leila R. Vale, Joel N. Ullom

Abstract

Low-temperature detector technologies provide extraordinary sensitivity for applications ranging from precision measurements of the cosmic microwave background to high-resolution, high-rate x-ray, and c-ray spectroscopy. To utilize this sensitivity, new instruments are being built, and new instruments are imagined, with ever greater pixel counts, but the scale of these instruments is limited by the capability of the readout electronics. Microwave SQUID multiplexing addresses the needs of these future instruments, exploiting gigahertz of bandwidths of coaxial cables and broadband components to combine hundreds to thousands of signals on a single readout line. A key feature of any multiplexer is the level of crosstalk between input channels. This crosstalk can degrade the sensitivity of the instrument, introduce systematic error, or simply confound data analysis. In this letter, we explain the primary mechanisms of crosstalk in a microwave SQUID multiplexer, calculate and measure their magnitude, and consider their effect and methods of mitigation.

Citation

Applied Physics Letters

Volume

115

Pub Type

Journals

Download Paper

https://doi.org/10.1063/1.5116573

Local Download

Keywords

transition-edge sensor, SQUID, crosstalk, multiplexer, magnitude, low-temperature detector technologies, cosmic microwave, capability

Citation

Mates, J. , Becker, D. , Bennett, D. , Dober, B. , Gard, J. , Hilton, G. , Swetz, D. , Vale, L. and Ullom, J. (2019), Crosstalk in microwave SQUID multiplexers, Applied Physics Letters, [online], https://doi.org/10.1063/1.5116573 (Accessed April 26, 2024)