  Pulse activated transitions from the metastable to the running state and
viceversa have been observed in a stacked double tunnel Nb-based Josephson
system. Experimental results are compared with numerical simulations based on
the Sine-Gordon model of the stacked junctions by injecting pulses with
variable amplitude in one of the junctions of the stack, and observing the
voltage response of the other junction. Both experimental and numerical results
show the possibility to induce both direct and back-switching transitions from
the metastable to the running state simply by changing the amplitude of the
electronic pulses injected across the stack device.
