Thermodynamic uncertainty relation in nondegenerate and degenerate maser heat engines

TL;DR

This paper explores the thermodynamic uncertainty relation in maser heat engines, revealing violations, invariances, and the influence of noise-induced coherence on power fluctuations in different configurations.

Contribution

It provides a detailed analysis of TUR violations and invariances in nondegenerate and degenerate maser heat engines, highlighting the role of noise-induced coherence.

Findings

Standard TUR is violated in high-temperature limit for both configurations.

TUR invariance under rescaling of coupling constants.

Noise-induced coherence can suppress or enhance power fluctuations.

Abstract

We investigate the thermodynamic uncertainty relation (TUR), \textit{i.e.} a trade-off between entropy production rate and relative power fluctuations, for nondegenerate three-level and degenerate four-level maser heat engines. In the nondegenerate case, we consider two slightly different configurations of three-level maser heat engine and contrast their degree of violation of standard TUR. In the high-temperature limit, standard TUR relation is always violated for both configurations. We also uncover an invariance of TUR under simultaneous rescaling of the matter-field coupling constant and system-bath coupling constants. For the degenerate four level engine, we study the effects of noise-induced coherence on TUR. We show that depending on the parametric regime of operation, noise-induced coherence can either suppress or enhance the relative power fluctuations.