TITLE

Quantum noise in a terahertz hot electron bolometer mixer

AUTHOR(S)
Zhang, W.; Khosropanah, P.; Gao, J. R.; Kollberg, E. L.; Yngvesson, K. S.; Bansal, T.; Barends, R.; Klapwijk, T. M.
PUB. DATE
March 2010
SOURCE
Applied Physics Letters;3/15/2010, Vol. 96 Issue 11, p111113
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have measured the noise temperature of a single, sensitive superconducting NbN hot electron bolometer (HEB) mixer in a frequency range from 1.6 to 5.3 THz, using a setup with all the key components in vacuum. By analyzing the measured receiver noise temperature using a quantum noise (QN) model for HEB mixers, we confirm the effect of QN. The QN is found to be responsible for about half of the receiver noise at the highest frequency in our measurements. The β-factor (the quantum efficiency of the HEB) obtained experimentally agrees reasonably well with the calculated value.
ACCESSION #
48698077

 

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