Kavli Affiliate: James J. Bock
| First 5 Authors: Shubh Agrawal, Bryan Steinbach, James J. Bock, Clifford Frez, Lorenzo Minutolo
| Summary:
We demonstrate strong negative electrothermal feedback accelerating and
linearizing the response of a thermal kinetic inductance detector (TKID). TKIDs
are a proposed highly multiplexable replacement to transition-edge sensors and
measure power through the temperature-dependent resonant frequency of a
superconducting microresonator bolometer. At high readout probe power and probe
frequency detuned from the TKID resonant frequency, we observe electrothermal
feedback loop gain up to $mathcal L$ $approx$ 16 through measuring the
reduction of settling time. We also show that the detector response has no
detectable non-linearity over a 38% range of incident power and that the
noise-equivalent power is below the design photon noise.
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