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

Conference · 01 August 2023

DOI:https://doi.org/10.1109/tasc.2023.3237645· OSTI ID:2426623

Li, Juliang; Barry, P. S.; Cecil, Thomas; Chang, Clarence L.; Dibert, Karia; Gualtieri, Riccardo; Lisovenko, Margarita; Pan, Zhaodi; Yefremenko, Volodymyr; Wang, Gensheng; Zhang, Jianjie

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 tqp approaches a constant value at low temperature.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: USDOE Office of Science - Office of Basic Energy Sciences; USDOE Office of Science - Office of High Energy Physics
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 2426623
• Country of Publication: United States
• Language: English