|
|||||
|
|
Fabrication and characterization of ultra-low noise narrow and wide band Josephson parametric amplifiers |
|
| Affiliation: | 1.Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China;2.Department of Physics, Zhejiang University, Hangzhou 310027, China;3.School of Physics, University of Chinese Academy of Sciences, Beijing 100190, China;4.CAS Centre for Excellence and Synergetic Innovation Centre in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China |
| 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 |
| 本文献已被 CNKI 等数据库收录！ | |
| 点击此处可从《中国物理 B》浏览原始摘要信息 | |
| 点击此处可从《中国物理 B》下载免费的PDF全文 | |
