A non-local cryogenic thermometer based on Coulomb-coupled systems

Abstract

We propose a realistic design for Coulomb-coupled system based non-local cryogenic electrical thermometer. The operation of the proposed thermometer relies on electrostatic interaction between Coulomb coupled quantum dots, resulting in a overall change in conductance due to change in the remote reservoir temperature. The performance and regime of operation of the proposed thermometer is then theoretically investigated using density matrix formulation and compared with another recently proposed Coulomb coupled system based thermometer. It is demonstrated that the proposed design ensures a superior temperature sensitivity and robustness compared to the other design proposed in literature (Physica E, 114, 113635, 2019). At the end we investigate the regime of optimal operation and comment on the ground state configuration for optimal operation of the proposed thermometer. The design proposed in this paper can be employed to construct highly efficient non-local cryogenic thermometers.