Second-generation quantum technologies are the key to innovative applications in the fields of communication, sensing, information processing, and imaging. In the area of quantum communication, Fraunhofer HHI develops deployable systems for tapproof communication via fiber networks and free-space optical links using quantum key distribution (QKD). The institute can draw on world-leading expertise along the whole integration chain, from photonic chips to entire networks. Based on these key competences, researchers at Fraunhofer HHI develop photonic components, modules and systems together with its partners. All products are tailored to the high requirements in fields such as quantum sensors, quantum communication and quantum information processing.