Sub-Kelvin Thermometer for On-Chip Measurements of Microwave Devices Utilizing Two-Level Systems in Superconducting Microresonators

Abstract

We present a superconducting microresonator thermometer based on two-level systems (TLS) that is drop-in compatible with cryogenic microwave systems. The operational temperature range is 50-1000~mK (which may be extended to 5~mK), and the sensitivity (50-75~$\mu$K/$\sqrt{\mathrm{Hz}}$) is relatively uniform across this range. The miniature footprint that conveniently attaches to the feedline of a cryogenic microwave device facilitates the measurement of on-chip device temperature and requires no additional thermometry wiring or readout electronics. We demonstrate the practical use of these TLS thermometers to investigate static and transient chip heating in a kinetic inductance traveling-wave parametric amplifier operated with a strong pump tone. TLS thermometry may find broad application in cryogenic microwave devices such as superconducting qubits and detectors.

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Cited by in corpus (5)

• Harnessing coherence generation for precision single- and two-qubit quantum thermometry
• Investigation of Optical Coupling in Microwave Kinetic Inductance Detectors using Superconducting Reflective Plates
• Leveraging collective effects for thermometry in waveguide quantum electrodynamics
• Measuring pulse heating in Si quantum dots with individual two-level fluctuators
• Effects of the thin-film thickness on superconducting NbTi microwave resonators for on-chip cryogenic thermometry