Our team has demonstrated a powerful new method to study single-photon emitters in solid-state materials, paving the way for advances in secure quantum communication. Using the Rotating Quarter-Wave Plate (RQWP) technique, we performed the first dynamic polarization analysis of quantum emitters in hexagonal boron nitride (hBN). By tracking how single photons evolve in polarization over time, we uncovered complex dynamics that were previously inaccessible. These insights are highly relevant for quantum key distribution (QKD), where the polarization state of individual photons is used to encode and transmit information securely. Understanding and controlling polarization behavior at this level is critical for minimizing errors and improving the performance of quantum communication systems. Beyond hBN, our approach can be applied to a wide range of solid-state quantum emitters, offering a versatile tool for the development of next-generation quantum technologies. [Read more →]