Cryogenic amplifier with low input-referred voltage noise calibrated by shot noise measurement  

作　　者：Wuhao Yang Jian Wei 杨伍昊;危健(International Center for Quantum Materials, School of Physics, Peking University)

机构地区：International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China

出　　处：《Chinese Physics B》2018年第6期207-212,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11474008);the National Key Research and Development Program of China(Grant No.2016YFA0300904);the National Basic Research Program of China(Grant No.2011CBA00106)

摘　　要：A low-noise cryogenic amplifier for the bandwidth from 100 kHz to 2 MHz with commercially available components is presented. The amplifier is mounted on the cold finger of our home-made liquid helium dipstick. The input imp√edance of the amplifier is 2 k？. The input-referred voltage noise of the amplifier at approximately 2 MHz is around 1 n V/Hz^（1/2）. We demonstrate the performance of the amplifier by measuring shot noise on the Al/AlOx/Al tunneling junction with resistance about 17 k？ at liquid helium temperature.A low-noise cryogenic amplifier for the bandwidth from 100 kHz to 2 MHz with commercially available components is presented. The amplifier is mounted on the cold finger of our home-made liquid helium dipstick. The input imp√edance of the amplifier is 2 k？. The input-referred voltage noise of the amplifier at approximately 2 MHz is around 1 n V/Hz^（1/2）. We demonstrate the performance of the amplifier by measuring shot noise on the Al/AlOx/Al tunneling junction with resistance about 17 k？ at liquid helium temperature.

关 键 词：cryogenic amplifier shot noise shadow evaporation tunneling junction 

分 类 号：O4[理学—物理]