Sub-kelvin thermometer for on-chip measurements of microwave devices utilizing two-level systems in superconducting microresonators
Jordan Wheeler, Michael Vissers, Maxime Malnou, Johannes Hubmayr, Joel Ullom, Jiansong Gao
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.
, Vissers, M.
, Malnou, M.
, Hubmayr, J.
, Ullom, J.
and Gao, J.
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 October 1, 2023)