Accurate Coulomb Blockade Thermometry up to 60 Kelvin

TL;DR

This paper presents a highly accurate Coulomb Blockade Thermometry technique capable of measuring temperatures up to 60 Kelvin with about 1% uncertainty, enabled by advanced nano fabrication methods.

Contribution

The authors demonstrate a precise CBT method operational up to 60 K, utilizing improved nano fabrication for uniform tunnel junction arrays.

Findings

Temperature measurement accuracy of about 1%

Operation of CBT up to 60 Kelvin

Successful fabrication of uniform tunnel junction arrays

Abstract

We demonstrate experimentally a precise realization of Coulomb Blockade Thermometry (CBT) working at temperatures up to 60 K. Advances in nano fabrication methods using electron beam lithography allow us to fabricate a uniform arrays of sufficiently small tunnel junctions to guarantee an overall temperature reading uncertainty of about 1\%