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We report high-fidelity, quantum nondemolition, single-shot readout of asuperconducting transmon qubit using a DC-biased superconducting low-inductanceundulatory galvanometer(SLUG) amplifier. The SLUG improves the systemsignal-to-noise ratio by 7 dB in a 20 MHz window compared with a bare HEMTamplifier. An optimal cavity drive pulse is chosen using a genetic searchalgorithm, leading to a maximum combined readout and preparation fidelity of91.9% with a measurement time of Tmeas = 200ns. Using post-selection to removepreparation errors caused by heating, we realize a combined preparation andreadout fidelity of 94.3%.

High fidelity single-shot readout of a transmon qubit using a SLUG {\mu}wave amplifier