2025/06/03 by Mayo, Franco, Sobrino, Nahual, Fazio, Rosario +2 · 1 citation
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Superconductivity (cond-mat.supr-con)
paper · doi:10.48550/arxiv.2506.02904
We study the violation of thermodynamic uncertainty relations (TURs) in hybrid superconducting/normal metal leads coupled to a central region containing localized levels. We find violations of the TUR, also in its formulation recently derived for coherent conductors [Phys. Rev. Lett. 135, 046302 (2025)], due to the presence of macroscopic quantum coherence related to the superconducting condensate. To support our conclusion, we introduce a dephasing probe, demonstrating that the violation is directly correlated with the superconducting coherence, as measured by the pair amplitude in the central region. When the central region is a Cooper-pair splitter, crossed Andreev processes introduce nonlocal superconducting correlations that further enhance the violation. Finally, we derived a new inequality, fulfilled in hybrid superconducting - normal metal systems, in the limit in which quasi-particle tunneling can be ignored.