Generation-Recombination Noise: The Fundamental Sensitivity Limit for Kinetic Inductance Detectors
Generation-Recombination Noise: The Fundamental Sensitivity Limit for Kinetic Inductance Detectors
复制标题
生成复合噪声：动感电感探测器的基本灵敏度极限
DOI：
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发表时间：
2012
影响因子：
2
通讯作者：
T. Klapwijk
中科院分区：
文献类型：
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作者：
P. Visser;P. Visser;J. Baselmans;P. Diener;S. Yates;A. Endo;T. Klapwijk
We present measurements of quasiparticle generation-recombination noise in aluminium Microwave Kinetic Inductance Detectors, the fundamental noise source for these detectors. Both the quasiparticle lifetime and the number of quasiparticles can be determined from the noise spectra. The number of quasiparticles saturates to 10 μm−3 at temperatures below 160 mK, which is shown to limit the quasiparticle lifetime to 4 ms. These numbers lead to a generation-recombination noise limited noise equivalent power (NEP) of 1.5×10−19 W/Hz1/2. Since NEP∝Nqp, lowering the number of remnant quasiparticles will be crucial to improve the sensitivity of these detectors. We show that the readout power now limits the number of quasiparticles and thereby the sensitivity.
