Thermodynamic, kinetic, and thermokinetic uncertainty relations are derived for arbitrary currents in coherent transport, remaining valid far from equilibrium and in superconducting hybrid structures.
Comment on "Fluctuation Theorem Uncertainty Relation" and "Thermodynamic Uncertainty Relations from Exchange Fluctuation Theorems"
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abstract
In recent letter [Phys.~Rev.~Lett {\bf 123}, 110602 (2019)], Y.~Hasegawa and T.~V.~Vu derived a thermodynamic uncertainty relation. But the bound of their relation is loose. In this comment, through minor changes, an improved bound is obtained. This improved bound is the same as the one obtained in [Phys.~Rev.~Lett {\bf 123}, 090604 (2019)] by A.~M.~Timpanaro {\it et. al.}, but the derivation here is straightforward.
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Uncertainty relations for arbitrary currents in coherent transport
Thermodynamic, kinetic, and thermokinetic uncertainty relations are derived for arbitrary currents in coherent transport, remaining valid far from equilibrium and in superconducting hybrid structures.