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29 August 2022 The anomalous response of photon counting MKIDs made from disordered superconductors
Steven de Rooij, Kevin Kouwenhoven, Vignesh Murugesan, David J. Thoen, Jochem J. A. Baselmans, Pieter J. de Visser
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Proceedings Volume 12191, X-Ray, Optical, and Infrared Detectors for Astronomy X; 1219111 (2022) https://doi.org/10.1117/12.2629326
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
Abstract
Over de past decade, conventional superconductors (like Al), have been replaced by disordered superconductors (like beta-Ta, PtSi, Hf and TiN) in visible/near-infrared MKIDs, improving the responsivity and quantum efficiency. However, important detector characteristics, such as the single photon pulse decay time and generation-recombination (GR) noise levels, of disordered MKIDs are presently not understood. We present temperature dependent GR noise and single photon (1545 – 402 nm) pulse measurements in MKIDs made from beta-Ta (Tc=1.0 K, ρ=240 μΩcm) and show that it does not follow theory. We hypothesize that quasiparticle trapping causes this deviation.
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Steven de Rooij, Kevin Kouwenhoven, Vignesh Murugesan, David J. Thoen, Jochem J. A. Baselmans, and Pieter J. de Visser "The anomalous response of photon counting MKIDs made from disordered superconductors", Proc. SPIE 12191, X-Ray, Optical, and Infrared Detectors for Astronomy X, 1219111 (29 August 2022); https://doi.org/10.1117/12.2629326
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KEYWORDS
Superconductors
Photon counting
Quasiparticles
Single photon
Aluminum
Quantum efficiency
Sensors
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