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arXiv · 1401.5184

High fidelity single-shot readout of a transmon qubit using a SLUG μwave amplifier

Yanbing Liu·Srikanth Srinivasan·D. Hover·Shaojiang Zhu·R. McDermott·A. A. Houck
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Abstract

We report high-fidelity, quantum nondemolition, single-shot readout of a superconducting transmon qubit using a DC-biased superconducting low-inductance undulatory galvanometer(SLUG) amplifier. The SLUG improves the system signal-to-noise ratio by 7 dB in a 20 MHz window compared with a bare HEMT amplifier. An optimal cavity drive pulse is chosen using a genetic search algorithm, leading to a maximum combined readout and preparation fidelity of 91.9% with a measurement time of Tmeas = 200ns. Using post-selection to remove preparation errors caused by heating, we realize a combined preparation and readout fidelity of 94.3%.

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Yanbing Liu, Srikanth Srinivasan, D. Hover, Shaojiang Zhu, R. McDermott, A. A. Houck. 2014-01-21. High fidelity single-shot readout of a transmon qubit using a SLUG μwave amplifier. https://doi.org/10.1088/1367-2630%2F16%2F11%2F113008

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