Thermometry in dual quantum dot set-up with staircase ground state configuration

TL;DR

This paper introduces a dual quantum dot setup with a staircase ground state for precise cryogenic temperature measurement, utilizing thermally controlled inelastic tunnelling to achieve high sensitivity.

Contribution

It presents a novel quantum dot configuration for thermometry, demonstrating optimal performance at low temperatures through quantum master equation analysis.

Findings

Maximum temperature sensitivity at low temperatures

Effective inelastic tunnelling-based thermometry

Potential for high-performance cryogenic sensors

Abstract

We propose and investigate thermometry of a setup employing dual quantum dots with staircase ground state configuration. The stair-case ground state configuration actuates thermally controlled inelastic tunnelling, which translates into a temperature sensitive conductance, thereby inducing thermometry. The performance of the set-up is then analyzed employing quantum master equation (QME) for such systems in the sequential tunnelling regime. In particular, it is demonstrated that the system performance, in terms of temperature sensitivity and efficiency, is maximum in the regime of low temperature, making such system suitable for cryogenic thermometry. The proposed set-up can pave the path towards realization of high performance cryogenic nano temperature sensors.