Open AccessСверхпроводящий источник шума для сверхнизких температур
Author(s) -
Т.М. Ким,
С.В. Шитов
Publication year - 2021
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2021.24.51791.18897
Subject(s) - black body radiation , superconductivity , coplanar waveguide , materials science , atmospheric temperature range , optoelectronics , tunnel junction , modulation (music) , noise (video) , physics , condensed matter physics , optics , radiation , quantum tunnelling , quantum mechanics , artificial intelligence , microwave , meteorology , acoustics , computer science , image (mathematics)
The device operates at temperatures <300 mK and comprises a hafnium microbridge and a superconducting aluminum tunnel junction both integrated into a common coplanar waveguide. The microbridge is a thermodynamic source and operates as an optical blackbody at frequencies 600–700 GHz. The coplanar terminal is the blackbody output in the 1–2 GHz frequency range. The microbridge temperature can be set in the range of 0.4–9 K and calibrated using the shot noise of the tunnel junction. Activation and temperature modulation of each of the sources can be performed independently using a direct current which transit them from the superconducting to the normal state with characteristic times <0.1 ms and heating power <1 μW.