Title :
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
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-AlOx-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-AlOx-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;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2011.2157430
