  We investigate the circuit quantum electrodynamics of anharmonic
superconducting nanowire oscillators. The sample circuit consists of a
capacitively shunted nanowire with a width of about 20 nm and a varying length
up to 350 nm, capacitively coupled to an on-chip resonator. By applying
microwave pulses we observe Rabi oscillations, measure coherence times and the
anharmonicity of the circuit. Despite the very compact design, simple top-down
fabrication and high degree of disorder in the oxidized (granular) aluminum
material used, we observe lifetimes in the microsecond range.
