This paper by Handel and Hall examines quantum 1/f noise in THz detectors and generators, submitted to International Journal of High Speed Electronics and Systems in 2006. The research analyzes fundamental noise limitations in terahertz frequency devices including quantum cascade lasers, Schottky diode mixers, and bolometric detectors, showing how quantum 1/f noise affects sensitivity, noise equivalent power, and frequency stability in the technologically important terahertz gap between microwave and infrared regions for imaging, spectroscopy, and communications applications.