Researchers from the University of Oxford have demonstrated the first wireless quantum key distribution (QKD) system operating in the ultraviolet-C (UV-C) spectral region. Most current wireless QKD systems rely on visible or infrared wavelengths, where background sunlight can easily overwhelm weak single-photon signals. By operating in the "solar-blind" UV-C band—where sunlight is naturally absorbed by Earth's ozone layer—the team achieved a clean signal with secure key rates exceeding 1 Mbit/s in laboratory tests. Published in Optica Quantum, this advance offers a promising path toward secure outdoor quantum communications for financial transactions, healthcare data, and critical infrastructure even under direct daylight. Read the paper in Optica Quantum with the link in our bio. #QuantumTech #Cybersecurity #Optics