PT Unknown AU Tretyakov, IV Ryabchun, SA Maslennikov, SN Finkel, MI Kaurova, NS Seleznev, VA Voronov, BM Gol'tsman, GN TI NbN HEB mixer: fabrication, noise temperature reduction and characterization SE Proc. Basic problems of superconductivity PY 2008 DE HEB; mixer; noise temperature; conversion gain bandwidth AB We demonstrate that in the terahertz region superconducting hot-electron mixers offer the lowest noise temperature, opening the possibility of using HTS's in the future to fabricate these devices. Specifically, a noise temperature of 950 K was measured for the receiver operating at 2.5 THz with a NbN HEB mixer, and a gain bandwidth of 6 GHz was measured at 300 GHz near Tc for the same mixer. PI Moscow-Zvenigorod ER