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arXiv · 2603.13153

MgB$_2$ Thermal Kinetic Inductance Detector

T. Jabbari·A. Hawkins·A. Wandui·C. Frez·J. Greenfield·C. Roberson·M. J. Lee·P. Mauskopf·D. Cunnane
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Abstract

Thermal Kinetic Inductance Detectors (TKIDs) inherently combine the phonon-limited noise performance of traditional bolometers with the array scalability and responsivity of superconducting kinetic inductance detectors. Using a superconducting resonator as the thermally sensitive element provides high responsivity and tunable dynamic range, with phonon noise set by the cryogenic operating temperature of the free-standing membrane. In this work, MgB$_2$-based TKIDs are demonstrated operating from below 1 K up to 20 K with characterized noise-equivalent power (NEP) using integrated on-membrane heaters. A comprehensive characterization of electrical, thermal, and noise properties is presented. Phonon noise-limited performance is demonstrated from 4 to 8 K.

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T. Jabbari, A. Hawkins, A. Wandui, C. Frez, J. Greenfield, C. Roberson, M. J. Lee, P. Mauskopf, D. Cunnane. 2026-03-13. MgB$_2$ Thermal Kinetic Inductance Detector. https://arxiv.org/abs/2603.13153

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