  We demonstrate coherent control and measurement of a superconducting qubit
coupled to a superconducting coplanar waveguide resonator with a dynamically
tunable qubit-cavity coupling strength. Rabi oscillations are measured for
several coupling strengths showing that the qubit transition can be turned off
by a factor of more than 1500. We show how the qubit can still be accessed in
the off state via fast flux pulses. We perform pulse delay measurements with
synchronized fast flux pulses on the device and observe $T_1$ and $T_2$ times
of 1.6 and 1.9 $\mu$s, respectively. This work demonstrates how this qubit can
be incorporated into quantum computing architectures.
