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Nb-based Josephson parametric amplifier for superconducting qubit measurement |
| Fei-Fan Su(宿非凡)1,2, Zi-Ting Wang(王子婷)1,2, Hui-Kai Xu(徐晖凯)1,2, Shou-Kuan Zhao(赵寿宽)1,2, Hai-Sheng Yan(严海生)1,2, Zhao-Hua Yang(杨钊华)1,2, Ye Tian(田野)1,2, Shi-Ping Zhao(赵士平)1,2,3 |
1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences(CAS), Beijing 100190, China;
2 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
3 CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China |
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Abstract 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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Received: 18 July 2019
Revised: 20 August 2019
Accepted manuscript online:
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PACS:
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03.67.Lx
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(Quantum computation architectures and implementations)
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85.25.Cp
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(Josephson devices)
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74.50.+r
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(Tunneling phenomena; Josephson effects)
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| Fund: Project supported by the Science Funds from the Ministry of Science and Technology of China (Grant Nos. 2015CB921104 and 2016YFA0300601), the National Natural Science Foundation of China (Grant Nos. 11674380 and 11874063), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDB07010300 and XDB28000000), and the Key Research and Development Program of Guangdong Province, China (Grant No. 2018B030326001). |
Corresponding Authors:
Shi-Ping Zhao
E-mail: spzhao@iphy.ac.cn
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Cite this article:
Fei-Fan Su(宿非凡), Zi-Ting Wang(王子婷), Hui-Kai Xu(徐晖凯), Shou-Kuan Zhao(赵寿宽), Hai-Sheng Yan(严海生), Zhao-Hua Yang(杨钊华), Ye Tian(田野), Shi-Ping Zhao(赵士平) Nb-based Josephson parametric amplifier for superconducting qubit measurement 2019 Chin. Phys. B 28 110303
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