Quantum Thermal Machine as a Thermometer
Abstract
We propose the use of a quantum thermal machine for low-temperature thermometry. A hot thermal reservoir coupled to the machine allows for simultaneously cooling the sample while determining its temperature without knowing the model-dependent coupling constants. In its most simple form, the proposed scheme works for all thermal machines which perform at Otto efficiency and can reach Carnot efficiency. We consider a circuit QED implementation which allows for precise thermometry down to 15 mK with realistic parameters. Based on the quantum Fisher information, this is close to the optimal achievable performance. This implementation demonstrates that our proposal is particularly promising in systems where thermalization between different components of an experimental setup cannot be guaranteed.
Cite
@article{arxiv.1703.03719,
title = {Quantum Thermal Machine as a Thermometer},
author = {Patrick P. Hofer and Jonatan Bohr Brask and Martí Perarnau-Llobet and Nicolas Brunner},
journal= {arXiv preprint arXiv:1703.03719},
year = {2017}
}
Comments
Main text: 5 pages, 4 figures; Supplement: 5 pages