2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/21390On the basis of the equivalence of the energy balance deacription at micro- and macro-level we propose a quantum generalization of the viscous friction law for a macroscopic Langevin equation describing thermal fluctuations without the zero point contribution. This equation recovers the classical case in the limit h -> 0. In particular it satisfies the quantum regression theorem and resolves several anomalies appearing in the quantum extension of the fluctuation dissipation theorem.5 pages, 0 figures, submitted to Phys.Rev.Lett. on 09.05.2003Statistical Mechanicstext