Kavli Affiliate: Sunil R. Golwala
| First 5 Authors: Karthik Ramanathan, Osmond Wen, Taylor Aralis, Ritoban Basu Thakur, Bruce Bumble
| Summary:
Microwave Kinetic Inductance Detectors (MKIDs) have been demonstrated as
capable phonon sensors when coupled to crystalline substrates, and have been
proposed as detectors for next-generation rare-event searches such as for the
direct detection of dark matter. These Kinetic Inductance Phonon Mediated
(KIPM) detector designs, favoring large superconducting absorber volumes and
high readout powers, are oftentimes limited in their sensitivity by low
temperature amplifier noise introduced in the signal readout chain. We report
here an effort to couple a wideband Kinetic Inductance Travelling Wave
Parametric Amplifier (KI-TWPA), operated near the Standard Quantum Limit of
minimal added amplifier noise, to sensors spanning a 70 MHz bandwidth at 3.5
GHz. This results in a ~5x improvement in the inferred detector energy
resolution in the best sensor and highlights the potential of constructing
O(100) meV resolving phonon-mediated particle detectors. We detail limitations
introduced by lossy passive components, degraded RF responsivity, and
microphysical noise sources like two-level systems (TLS), in achieving ultimate
quantum-limited system noise levels.
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