Fig. 4

Engine fuelled by a non-thermal bath. Schematics of an engine fuelled by a hot non-thermal (e.g., squeezed thermal) bath that provides the input energy \({\cal E}_{{\mathrm{d,h}}}\). The engine operates in an arbitrary cycle wherein work is extracted by a piston and an amount of energy \({\cal E}_{{\mathrm{d,c}}}\) is dumped into the cold thermal bath