Quantum-enhanced performance in superconducting Andreev-reflection engines
arXiv:2302.09414 · doi:10.1103/PhysRevResearch.5.043041
Abstract
When a quantum dot is attached to a metallic reservoir and a superconducting contact Andreev processes leads to a finite subgap current at the normal lead and the creation or destruction of Cooper pairs. Andreev-reflection engines profit from the destruction of Cooper pairs to provide the work needed to set a charge current at the normal-conductor contact generating electrical power. For this power-transduction device high power and large efficiencies in quantum-mechanically enhanced regimes are demonstrated. There thermodynamic trade-off relations between power, efficiency and stability, valid for any classical engine are overcome, and kinetic constraints on the engine precision are largely surpassed in arbitrary far from equilibrium conditions.
arXiv comment5 + 5 pages, 3 Figures. v2: minor changes. Accepted in Physical Review Research
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