Shot noise and photon-induced correlations in 500 GHz SIS detectors

Author

Dubash, N.B. ; Wengler, M.J. ; Zmuidzinas, J.

Author_Institution

Conductus Inc., Sunnyvale, CA, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

3308

Lastpage

3311

Abstract

Photon-induced current correlations in SIS detectors can result in an output noise that is greater or less than shot noise. Evidence of these correlations had been observed for 100 GHz rf by accurate noise measurements as reported in our previous work. We now present a detailed analysis of these current correlations for frequencies between 100 and 500 GHz. We also report new measurements of photon-induced noise in a 490 GHz SIS mixer, and discuss the Gaussian beam techniques used to eliminate the thermal background radiation. For small 490 GHz rf power, the output noise is equal to shot noise. The results of the 100 and 490 GHz photon noise measurement are summarized in context to shot noise and the effect of the current correlations predicted by the theoretical model.<>

Keywords

shot noise; submillimetre wave detectors; superconducting device noise; superconducting microwave devices; superconductor-insulator-superconductor devices; 100 to 500 GHz; Gaussian beam; RF power; SIS detectors; photon noise; photon-induced current correlations; shot noise; thermal background radiation; Acoustical engineering; Bandwidth; Current measurement; Detectors; Frequency; Gunshot detection systems; Noise generators; Noise measurement; Optical noise; Tunneling;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.403299

Filename

403299