Dark-State-Induced Heat Rectification

TL;DR

This paper introduces a quantum heat rectifier exploiting dark states to achieve high rectification ratios, demonstrating robustness and potential for amplification via external driving in realistic quantum systems.

Contribution

It proposes a novel quantum heat rectifier based on dark states in a qutrit system, achieving high rectification ratios and robustness against decay and dephasing.

Findings

Rectification ratios exceeding 10^3 with realistic parameters.

Heat current amplification by an order of magnitude through external driving.

Robust rectification over a wide parameter range.

Abstract

Heat and noise control is essential for the continued development of quantum technologies. For this purpose, a particularly powerful tool is the heat rectifier, which allows for heat transport in one configuration of two baths but not the reverse. Here we propose a class of rectifiers that exploits the unidirectionality of a low temperature bath to force the system into a dark state thus blocking heat transport in one configuration of the two baths. However, if the two baths are switched around, a heat current is observed. An implementation using a qutrit coupled to two harmonic oscillators is proposed and rectification values beyond $10^3$ are achieved for realistic parameter values. Furthermore, we show that the heat current can be amplified by an order of magnitude through external driving without diminishing the diode functionality. The heat rectification effect is seen for a large range of parameters, and it is robust towards both decay and dephasing.