2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/107058We investigate one dimensional models (the Blonder, Tinkham, Klapwijk model and a tight-binding model) of non local transport at normal metal / superconductor (NS) double interfaces. We find a negative elastic cotunneling crossed conductance, strongly enhanced by additional scatterers away from the interfaces, suggesting the possibility of reflectionless tunneling non local transport at double NS interfaces with contacts having a sufficiently small extension.7 pages, 5 figuresMesoscale and Nanoscale PhysicsSuperconductivitytext