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

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

doi:10.1088/1367-2630/16/11/113008

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

Quantum Physics 2016-04-07 v1

Authors: 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%.

Keywords

transmon qubit single-shot readout SLUG amplifier quantum nondemolition superconducting qubits readout fidelity

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@article{arxiv.1401.5184,
  title  = {High fidelity single-shot readout of a transmon qubit using a SLUG {\mu}wave amplifier},
  author = {Yanbing Liu and Srikanth Srinivasan and D. Hover and Shaojiang Zhu and R. McDermott and A. A. Houck},
  journal= {arXiv preprint arXiv:1401.5184},
  year   = {2016}
}

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4 pages and 3 figures

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

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