TY  - JOUR
AU  - Zhang, W.
AU  - Khosropanah, P.
AU  - Gao, J. R.
AU  - Kollberg, E. L.
AU  - Yngvesson, K. S.
AU  - Bansal, T.
AU  - Barends, R.
AU  - Klapwijk, T. M.
PY  - 2010
DA  - 2010//
TI  - Quantum noise in a terahertz hot electron bolometer mixer
T2  - Appl. Phys. Lett.
JO  - Applied Physics Letters
SP  - 111113-(1-3)
VL  - 96
IS  - 11
KW  - HEB mixer
KW  - quantum limit
KW  - quantum noise
KW  - vacuum box
KW  - THz
KW  - Terahertz
AB  - 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 beta-factor (the quantum efficiency of the HEB) obtained experimentally agrees reasonably well with the calculated value.
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=624), last updated on Tue, 01 Mar 2011 16:16:05 -0600
ID  - Zhang_etal2010
ER  -