2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/163912We non-perturbatively analyze the effect of electron-electron interactions on weak localization (WL) in relatively short metallic conductors with a tunnel barrier. We demonstrate that the main effect of interactions is electron dephasing which persists down to T=0 and yields suppression of WL correction to conductance below its non-interacting value. Our results may account for recent observations of low temperature saturation of the electron decoherence time in quantum dots.published version, 10 pagesMesoscale and Nanoscale Physicstext