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At present, nearly quantum-limited heterodyne receivers for Terahertz (THz)frequencies require cooling to temperatures below 4K. We are working to buildsemiconductor-based "tunable antenna-coupled intersubband terahertz" (TACIT)heterodyne mixers for 1-5 THz. We predict that they can achieve single-sidebandnoise temperatures of a few hundred K with intermediate frequency (IF)bandwidth >10 GHz, while operating at lattice temperatures >20 K and requiringlocal oscillator (LO) power ~ 1 $\mu$W.

Tunable Antenna-Coupled Intersubband Terahertz (TACIT) Mixers: The Quantum Limit Without the Quantum Liquid