Shot noise thermometry down to 10mK

The authors report measurements of the shot noise thermometer (SNT), a primary thermometer based on the electronic noise from a tunnel junction, in the range from 10to200mK. They demonstrate operation of the SNT down to 10mK with 10% accuracy at the lowest measured temperature. At 10mK, where for a measurement frequency of f=450MHz, hf=2.5kBT, the authors demonstrate that provided that quantum corrections are taken into account, the SNT continues to be a practical thermometer. They also show that self-heating is not a measurable problem and demonstrate a simplified readout of the SNT.