2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/19301This lecture note reviews a variety of transport and thermodynamic measurements of electron decoherence time in low-dimensional conductors at low temperature. The mechanism of dephasing by electron interaction mediated by an arbitrarily small number of magnetic impurities is neither applicable to our linear-response measurements of weak localization, nor is it observed in the recent high-field measurements of the decoherence time in nominally pure quasi-one dimensional gold wires. The source of decoherence, after extensive experiments, still appears to be intrinsic.34 pages, 19 figures; Invited lecture at the NATO Advanced Study Institute in Geilo, Norway (2001)Mesoscale and Nanoscale PhysicsQuantum Physicstext