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.

引用

页数：5

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