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

Dubash, Noshir B. and Wengler, Michael J. and Zmuidzinas, Jonas (1995) Shot noise and photon-induced correlations in 500 GHz SIS detectors. IEEE Transactions on Applied Superconductivity, 5 (2, Par). pp. 3308-3311. ISSN 1051-8223.

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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.

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Additional Information:© Copyright 1995 IEEE. Reprinted with permission. Manuscript received October 17, 1994. We thank Jeff Stern and Henry LeDuc at the Jet Propulsion Laboratory for fabrication of the 490 GHz SIS mixer circuits. This work was supported in part by NASA.
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Subject Keywords:shot noise; submillimeter wave detectors; superconducting device noise; superconducting microwave devices; superconductor-insulator-superconductor devices
Record Number:CaltechAUTHORS:DUBieeetas95
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ID Code:12257
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Deposited On:31 Oct 2008 01:16
Last Modified:26 Dec 2012 10:29

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