  It is proposed to measure the current noise generated in a mesoscopic
conductor by macroscopic quantum tunneling (MQT) in a current biased Josephson
junction placed in parallel to the conductor. The theoretical description of
this set-up takes into account the complete dynamics of detector and noise
source. Explicit results are given for the specific case of current
fluctuations in an oxide layer tunnel junction, and it is shown how the device
allows to extract the fourth order cumulant of the noise from the MQT data for
realistic experimental parameters.
