2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/16861Zero-frequency spectral densities of current noise, charge noise, and their cross-correlation are calculated for the SET transistor in the co-tunneling regime. The current noise has a form expected for the uncorrelated co-tunneling events. Charge noise is created by the co-tunneling and also by the second-order transitions in a single junction. Calculated spectral densities determine transistor characteristics as quantum detector.9 pages, 2 figuresMesoscale and Nanoscale Physicstext