This NUSOD 2014 paper by Handel and Truong presents quantum theory of 1/f noise in quantum well photodetectors. The research develops detailed quantum mechanical theory for predicting low-frequency noise in intersubband photodetectors based on quantum well structures, analyzing contributions from carrier capture, emission, and transport processes, providing design guidelines for minimizing noise and optimizing sensitivity in QWIP devices for infrared imaging, spectroscopy, and optical communications applications.