Speaker
Description
Superconducting microwave resonators, developed extensively in the context of Kinetic Inductance Detectors (KIDs), have great potential in astronomical detection due to their multiplexibility, high sensitivity, and ultra-low-noise performance. These detectors rely on sharp resonance curves characterized by high-quality factors (Q factors), which are critical for precise signal readout. However, the resonance properties are highly sensitive to environmental and operational conditions, including bath temperature, readout power, material properties, and geometric design. Understanding and optimizing these parameters are essential for advancing KID-based astronomical applications. This study focuses on analyzing the resonance behavior of superconducting resonators under a varying bath temperatures and readout powers. The key parameters of interest are the resonance frequency and Q factor, which are influenced by dominant dissipative mechanisms, namely two-level systems (TLS) and quasiparticle heating (QPH). Additionally, the nonlinear effects induced by high readout power are investigated to assess performance degradation in extreme operational regimes. Here, we present systematic measurements of resonance curves and extract resonance parameters across controlled temperature and readout power ranges. The observed data are interpreted using established TLS and QPH loss models to correlate theoretical predictions with empirical results. At low temperatures and powers, TLS losses dominate, while QPH effects become significant at higher power levels and resonance curve distortion is observed beyond a critical readout power threshold. These findings provide critical insights for optimizing superconducting resonator performance in next-generation astronomical instruments, particularly in understanding of KIDs performance limits and balancing sensitivity with dynamic range requirements.
| Session Selection | Condensed Matter |
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