Entanglement and thermo-kinetic uncertainty relations in coherent mesoscopic transport

Prech, Kacper; Johansson, Philip; Nyholm, Elias; Landi, Gabriel T.; Verdozzi, Claudio; Samuelsson, Peter; Potts, Patrick P.

doi:10.48550/arxiv.2212.03835

Cited by 1 publication

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“…Similarly to the TUR, the KUR consists of a universal bound on generic system currents in terms of the dynamical activity [63], which, contrary to dissipation, is symmetric under time-reversal [64]. Albeit passing almost unnoticed, the KUR can provide a powerful complement to the TUR in the description of engines working in nonequilibrium steady states [65], specially in far-fromequilibrium regimes [63,66] where the TUR becomes far from tight [51]. Extensions of the original TUR and KUR for quantum dynamics have been also recently reported [67][68][69][70].…”

Section: Introductionmentioning

confidence: 99%

Quantum-enhanced performance in superconducting Andreev-reflection engines

Manzano¹,

López²

2023

Preprint

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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.

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