Influence of device non-uniformities on the accuracy of Coulomb blockade thermometry

We investigate temperature uncertainty of Coulomb blockade thermometer (CBT) arising from inevitable non-uniformities in tunnel junction arrays. The corrections are proportional to the junction resistance variance in the linear operation regime and this result holds approximately also beyond this originally studied high temperature range. We present both analytical and numerical results, and discuss briefly their implications on achievable uniformity based on state-of-the-art fabrication of sensors.

Automated summary

This paper investigates the temperature uncertainty of a Coulomb blockade thermometer (CBT) caused by inevitable non-uniformities in tunnel junction arrays. The corrections are proportional to the variance of the junction resistance in the linear operation regime, and this relationship holds approximately beyond the originally studied high temperature range. Analytical and numerical results are presented, and their implications on achievable uniformity based on state-of-the-art fabrication of sensors are briefly discussed.