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When a quantum dot is attached to a metallic reservoir and a superconductingcontact Andreev processes leads to a finite subgap current at the normal leadand the creation or destruction of Cooper pairs. Andreev-reflection enginesprofit from the destruction of Cooper pairs to provide the work needed to set acharge current at the normal-conductor contact generating electrical power. Forthis power-transduction device high power and large efficiencies inquantum-mechanically enhanced regimes are demonstrated. There thermodynamictrade-off relations between power, efficiency and stability, valid for anyclassical engine are overcome, and kinetic constraints on the engine precisionare largely surpassed in arbitrary far from equilibrium conditions.

Quantum-enhanced performance in superconducting Andreev-reflection engines