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We propose a scheme for a quantum thermal machine made by atoms interactingwith a single non-equilibrium electromagnetic field. The field is produced by asimple configuration of macroscopic objects held at thermal equilibrium atdifferent temperatures. We show that these machines can deliver allthermodynamic tasks (cooling, heating and population inversion), and this byestablishing quantum coherence with the body on which they act. Remarkably,this system allows to reach efficiencies at maximum power very close to theCarnot limit, much more than in existing models. Our findings offer a newparadigm for efficient quantum energy flux management, and can be relevant forboth experimental and technological purposes.

Quantum thermal machines with single nonequilibrium environments