  The functionality of a nanowire integrated into a superconducting
transmission line acting as a single pole single throw switch is demonstrated.
The switch has an instantaneous bandwidth from 2 to 8 GHz with more than 10 dB
of isolation between the open and closed states. The switch consumes no power
in the closed state and $\approx 15~\rm{nW}$ in the open state. The rise and
fall response time between open and closed states is approximately
$370~\rm{ps}$.
