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arXiv · 2304.01156

Quasiparticle Generation-Recombination Noise in the Limit of Low Detector Volume

J. Li·P. S. Barry·T. Cecil·C. L. Chang·K. Dibert·R. Gualtieri·M. Lisovenko·Z. Pan·V. Yefremenko·G. Wang·J. Zhang
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Abstract

We have measured the quasiparticle generation-recombination (GR) noise in aluminium lumped element kinetic inductors with a wide range of detector volumes at various temperatures. The basic detector consists of meandering inductor and interdigitated capacitor fingers. The inductor volume is varied from 2 to 153 {\mu}m^{3} by changing the inductor width and length to maintain a constant inductance. We started with measuring the power spectrum density (PSD) of the detectors frequency noise which is a function of GR noise and we clearly observed the spectrum roll off at 10 kHz which corresponds to the quasiparticle lifetime. Using data from a temperature sweep of the resonator frequency we convert the frequency fluctuation to quasiparticle fluctuation and observe its strong dependence on detector volume: detectors with smaller volume display less quasiparticle noise amplitude. Meanwhile we observe a saturated quasiparticle density at low temperature from all detectors as the quasiparticle life time {\tau}qp approaches a constant value at low temperature.

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J. Li, P. S. Barry, T. Cecil, C. L. Chang, K. Dibert, R. Gualtieri, M. Lisovenko, Z. Pan, V. Yefremenko, G. Wang, J. Zhang. 2023-04-03. Quasiparticle Generation-Recombination Noise in the Limit of Low Detector Volume. https://doi.org/10.1109/tasc.2023.3237645

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