2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/167323The effect of quantum fluctuations on the current-voltage characteristics of Josephson junctions and superconducting nanowires is studied in the underdamped limit. Quantum fluctuations induce transitions between a Coulomb--blockade and a supercurrent branch, and can significantly modify the shape of current-voltage characteristics in the case of a highly resistive environment. Owing to the phase-charge duality, our results can be directly extended to the opposite overdamped limit.6 pages, 2 figures, replaced with published versionMesoscale and Nanoscale PhysicsSuperconductivitytext