Abstract
A Josephson junction noise thermometer directly coupled to a low noise preamplifier is analyzed. The absolute determination of temperature is disturbed by several effects: mixed down noise, additive noise, post-detection filter, etc. The analysis presented here takes these error sources into account, and the accuracy of the thermometer is estimated. The analysis shows that, exactly like an rf-biased i2-SQUID noise thermometer, a directly coupled noise thermometer is ultimately limited by the noise temperature of the preamplifier. Since the noise temperature of a state-of-the-art dc SQUID amplifier is excellent, sufficiently low uncertainty (less than 1%) can be obtained, even below 1 mK.
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