  We report experiments on superconducting flux qubits in a circuit quantum
electrodynamics (cQED) setup. Two qubits, independently biased and controlled,
are coupled to a coplanar waveguide resonator. Dispersive qubit state readout
reaches a maximum contrast of $72\,\%$. We find intrinsic energy relaxation
times at the symmetry point of $7\,\mu\text{s}$ and $20\,\mu\text{s}$ and
levels of flux noise of $2.6\,\mu \Phi_0/\sqrt{\text{Hz}}$ and $2.7\,\mu
\Phi_0/\sqrt{\text{Hz}}$ at 1 Hz for the two qubits. We discuss the origin of
decoherence in the measured devices. These results demonstrate the potential of
cQED as a platform for fundamental investigations of decoherence and quantum
dynamics of flux qubits.
