Fast high-fidelity charge readout by operating a cavity-embedded Cooper-pair transistor in the Kerr bistable regime
Fast high-fidelity charge readout by operating a cavity-embedded Cooper-pair transistor in the Kerr bistable regime
Operating the cavity-embedded Cooper-pair transistor (CCPT) in the Kerr bistable regime, we demonstrate single-shot resolution between two charge states that are $0.09e$ apart. The measurement is performed with $94\mathrm{%}$ fidelity in a duration of around $3\phantom{\rule{0.2em}{0ex}}\text{\ensuremath{\mu}}\mathrm{s}$. This is done with a drive power that corresponds to only 20 intracavity photons …