Nb-based Josephson parametric amplifier for superconducting qubit measurement

被引：6
|
作者：
Su, Fei-Fan [1 ,2 ]
Wang, Zi-Ting [1 ,2 ]
Xu, Hui-Kai [1 ,2 ]
Zhao, Shou-Kuan [1 ,2 ]
Yan, Hai-Sheng [1 ,2 ]
Yang, Zhao-Hua [1 ,2 ]
Tian, Ye [1 ,2 ]
Zhao, Shi-Ping [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China
[2] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
[3] Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing 100190, Peoples R China
来源：
CHINESE PHYSICS B | 2019年 / 28卷 / 11期
基金：
中国国家自然科学基金;
关键词：
superconducting qubit; Josephson parametric amplifier; device fabrication; quantum nondemolition measurement;
D O I：
10.1088/1674-1056/ab4578
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：5
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