Nb-based Josephson parametric amplifier for superconducting qubit measurement

We report a fabrication process and characterization of the Josephson parametric amplifier (JPA) for the single-shot quantum state measurement of superconducting multiqubit system. The device is prepared using Nb film as its base layer, which is convenient in the sample patterning process like e-bea...

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Bibliographic Details
Published inChinese physics B Vol. 28; no. 11; p. 110303
Main Authors Su, Fei-Fan, Wang, Zi-Ting, Xu, Hui-Kai, Zhao, Shou-Kuan, Yan, Hai-Sheng, Yang, Zhao-Hua, Tian, Ye, Zhao, Shi-Ping
Format Journal Article
LanguageEnglish
Published 01.11.2019
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Summary:We report a fabrication process and characterization of the Josephson parametric amplifier (JPA) for the single-shot quantum state measurement of superconducting multiqubit system. The device is prepared using Nb film as its base layer, which is convenient in the sample patterning process like e-beam lithography and film etching. Our results show that the JPA has a bandwidth up to 600 MHz with gain above 15 dB and noise temperature approaching the quantum limit. The qubit state differentiation measurements demonstrate the signal-to-noise ratio around 3 and the readout fidelity above 97% and 91% for the ground and first-excited states, respectively.
ISSN:1674-1056
DOI:10.1088/1674-1056/ab4578