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Sub-kelvin thermometer for on-chip measurements of microwave devices utilizing two-level systems in superconducting microresonators

Published

Author(s)

Jordan Wheeler, Michael Vissers, Maxime Malnou, Johannes Hubmayr, Joel Ullom, Jiansong Gao

Abstract

The design, implementation, and sensitivity of a new microwave multiplexable superconducting resonator thermometer based on two-level-systems are presented. The thermometer operates from 1 K to 50 mK and has the potential to measure down to 5 mK. The sensitivity measured in noise equivalent temperature is relatively uniform across the operational temperature range at 75 to 50 µK/√Hz. This thermometer, with a miniature footprint that requires no DC wiring, can be conveniently attached to the feedline of a cryogenic microwave device and measure its on-chip temperature. We demonstrate direct, fast (100s of Hz), and accurate temperature measurements of the transient and static chip heating of a kinetic inductance traveling-wave parametric amplifier induced by a strong pump tone. This thermometer may find broad applications in cryogenic microwave devices such as superconducting qubits and detectors.
Citation
Applied Physics Letters

Keywords

Cryogenic thermometry, microwave resonators, superconducting resonators, microwave kinetic inductance detectors

Citation

Wheeler, J. , Vissers, M. , Malnou, M. , Hubmayr, J. , Ullom, J. and Gao, J. (2021), Sub-kelvin thermometer for on-chip measurements of microwave devices utilizing two-level systems in superconducting microresonators, Applied Physics Letters, [online], https://doi.org/10.1063/5.0029351 (Accessed November 26, 2022)
Created November 13, 2021, Updated August 24, 2022