This SPIE-PW paper by Truong and Handel examines quantum 1/f noise theory and experiment in Quantum Well Infrared Photodetectors (QWIPs). The research combines theoretical predictions of quantum 1/f noise in intersubband photodetectors with experimental measurements, validating quantum noise models and demonstrating how fundamental 1/f noise limits detection sensitivity in QWIP focal plane arrays used for thermal imaging, analyzing the dependence of noise on quantum well design, doping, and operating temperature.