Rabi-oscillations in disordered superconducting nanowire qubit

At feature sizes of nanometer scale, superconducting wires made from a material with high normal state resistance show a pronounced nonlinear microwave response. Our material of choice, granular aluminum oxide, is a new material for superconducting quantum circuits which features not only a very high kinetic inductance but also microwave resonators with high quality factors. Microscopically, it can be described as a disordered network of nano-scale aluminum grains, coupled via the Josephson effect. We demonstrate a new type of superconducting quantum circuit, using capacitively shunted granular aluminum nanowires embedded as nonlinear circuit element. We present circuit characterization in microwave response measurements featuring Rabi-oscillations and measure state life times in the $\mu$s range.