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Single-shot readout of a superconducting flux qubit with a flux-driven Josephson parametric amplifier

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arxiv 1309.6706 v1 pith:7WN7BGN6 submitted 2013-09-26 cond-mat.supr-con cond-mat.mes-hallquant-ph

Z. R. Lin , K. Inomata , W. D. Oliver , K. Koshino , Y. Nakamura , J. S. Tsai , T. Yamamoto This is my paper · ORCID
classification cond-mat.supr-concond-mat.mes-hallquant-ph
keywords qubitreadoutamplifierfluxflux-drivenjosephsonparametricsingle-shot
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We report single-shot readout of a superconducting flux qubit by using a flux-driven Josephson parametric amplifier (JPA). After optimizing the readout power, gain of the JPA and timing of the data acquisition, we observe the Rabi oscillations with a contrast of 74% which is mainly limited by the bandwidth of the JPA and the energy relaxation of the qubit. The observation of quantum jumps between the qubit eigenstates under continuous monitoring indicates the nondestructiveness of the readout scheme.

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