  We focus on a metallic quantum dot coupled to a reservoir of electrons
through a single-mode quantum point contact and capacitively connected to a
back-gate, by taking into account that the gate voltage can exhibit noise; This
will occur when connecting the gate lead to an external transmission line with
a finite Ohmic resistance. The voltage (charge) fluctuations at the back gate
can be described through a Caldeira-Leggett model of harmonic oscillators. For
weak tunneling between the lead qnd the dot, exploiting the anisotropic
Bose-Fermi Kondo model, we show that zero-point fluctuations of the environment
can markedly alter the previous Matveev Kondo fixed point leading to an
amplification of the Coulomb blockade phenomenon.
