Środowiskowe Seminarium z Informacji i Technologii Kwantowych

“No SPADs in Spain” as the subtitle in http://optics.org/news/9/6/26 will remain the most appropriate way to describe our work in 4 words ever. I will first outline the motivation to abandon widespread single photon detectors (as SPADs) but change to homodyne detection and work on continuous-variable (CV) technologies. I will further show the transition from the first optical test setups to fully functional CV-QKD systems we shipped to Madrid in 2018 to deploy these fully functional devices in the telecom network of Telefonica. This of cause was only the first step to establish quantum technologies in real-world scenarios as to secure critical telecom infrastructures in future.