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Photograph of MSA with cooling fins.
(a) Schematic of the experimental configuration; and are the current and flux biases. (b) Schematic of the variable temperature resistor.
Output noise power measured with source at 300 mK and 100 mK; bath temperature was 45 mK.
Gain and noise temperature of the MSA at 45 mK. The blue line is a fit to the noise temperature data. The dashed-dotted red line represents .
Minimum measured noise temperature vs bath temperature . Dashed line is fit showing the proportionality of the noise temperature to solid line represents . Inset shows five lowest temperature points.
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