Broadband Shot Noise Measurement System at Low Temperature for Noise Thermometry Using a Tunnel Junction

Author

Park, Jung Hwan ; Rehman, Mushtaq ; Choi, Jung Suk ; Ryu, Sang-Wan ; Khim, Zheong G. ; Song, Woon ; Chong, Yonuk

Author_Institution

Korea Res. Inst. of Stand. & Sci., Daejeon, South Korea

Volume

61

Issue

1

fYear

2012

Firstpage

205

Lastpage

211

Abstract

We report our development of a broadband shot noise measurement experiment at Korea Research Institute of Standards and Science for noise thermometry. A precision RF measurement setup in the frequency range near 1 GHz has been installed in a He-3 refrigerator. For noise thermometry, we fabricated an Al-AlO_x-Al tunnel junction by the double-angle shadow evaporation technique as a source of noise. Temperature measurement was performed from 0.3 K to room temperature. The influence of each RF component was analyzed and tested to stabilize the measurement system. We compare two different diode detectors for RF power measurement. We describe the thermal anchoring scheme and the influence of tunnel junction imperfections.

Keywords

aluminium; aluminium compounds; cryogenics; electric noise measurement; radiofrequency measurement; shot noise; temperature measurement; tunnelling; Al-AlO_x-Al; Korea Research Institute of Standards and Science; RF component; RF power measurement; broadband shot noise measurement system; diode detector; double angle shadow evaporation technique; noise thermometry; temperature measurement; thermal anchoring scheme; tunnel junction; Current measurement; Junctions; Noise; Noise measurement; Radio frequency; Temperature measurement; Temperature sensors; Cryogenics; noise measurement; shot noise; temperature measurement; tunneling;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2011.2157430

Filename

5948380