Fabrication and characterization of ultra-low noise narrow and wide band Josephson parametric amplifiers

doi:10.1088/1674-1056/26/9/094203

Abstract

We have fabricated two types of lumped-element Josephson parameter amplifiers (JPAs) by using a multilayer micro-fabrication process involving wet etching of Al films. The first type is a narrow band JPA which shows typical gain above 14 dB in a bandwidth around 35 MHz. The second type is a wideband JPA which is coupled to an input 50 Ω transmission line via an impedance transformer that changes the impedance from about 15 Ω on the non-linear resonator side to 50 Ω on the input transmission line side. The wideband JPA could operate in a 200 MHz range with a gain higher than 14 dB. The amplifiers were used for superconducting qubit readout. The results showed that the signal to noise ratio and hence the readout fidelity were improved significantly.

Keywords: Josephson parameter amplifier multilayer micro-fabrication qubit state readout

Received: 15 May 2017
Accepted manuscript online:

PACS:	42.50.Dv	(Quantum state engineering and measurements)
	42.50.Ex	(Optical implementations of quantum information processing and transfer)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 91321208, 11374344, 11404386, 11574380, and 11674376), the Ministry of Science and Technology of China (Grant Nos. 2014CB921401 and 2016YFA0300601), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB07010300).

Corresponding Authors: Xiaobo Zhu, Dongning Zheng
E-mail: xbzhu16@ustc.edu.cn;dzheng@aphy.iphy.ac.cn

Cite this article:

Keqiang Huang(黄克强), Qiujiang Guo(郭秋江), Chao Song(宋超), Yarui Zheng(郑亚锐), Hui Deng(邓辉), Yulin Wu(吴玉林), Yirong Jin(金贻荣), Xiaobo Zhu(朱晓波), Dongning Zheng(郑东宁) Fabrication and characterization of ultra-low noise narrow and wide band Josephson parametric amplifiers 2017 Chin. Phys. B 26 094203

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[1]

Fabrication of Josephson parameter amplifier and its applicationin squeezing vacuum fluctuations
Pengtao Song(宋鹏涛), Xueyi Guo(郭学仪), Kai Xu(许凯), Xiaohui Song(宋小会), Zhan Wang(王战), Zhongcheng Xiang(相忠诚), Hekang Li(李贺康), Luhong Su(苏鹭红), Yirong Jin(金贻荣), and Dongning Zheng(郑东宁). Chin. Phys. B, 2021, 30(12): 128502.

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Fabrication and characterization of ultra-low noise narrow and wide band Josephson parametric amplifiers

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