Tutorials

The basic functionality of QKD has been demonstrated in the context of large (scientific) testbeds. International standards are also available. In the meantime, there are products that work in the normal operational/technical environment. Nevertheless, quantum key distribution (QKD) has so far its l...

The Quantum Key Distribution (QKD) has limits, especially regarding distances. However, general useability has been shown in the context of large (scientific) testbeds. International standards are available. There already exist products that are suitable for normal operational/technical environments...

Despite some issues there already exist practical considerations and network realizations especially regarding Metropolitan Area Networks. In the fifth part the tutorial, presents aspects regarding the coexistence with classical data and selected testbeds, including the entanglement based approaches...

Next to the generation of quantum keys, e.g. for single-use password, their use to setup secured networks is an important topic. In the fourth part  the tutorials explain how quantum secured networks are set up and present security strategies and how keys are distributed in the network. Dr. Peter...

Since repeating in quantum networks is not ready for operation anytime soon, a more modest approach is needed for network construction. The remedy is smaller-scale and more tightly meshed networks in the 100 km range. This places higher demands on security and performance, especially for key generat...

"Quantum repeating" is a core element of a functioning transmission of information over a larger distance. Due to the no-cloning theorem, creating a quantum duplicate, as is common in classical signal processing, is not possible. Therefore, it requires new network devices such as quantum memories an...

The history of the development of data communications has actually been told. Progress is currently limited to a slight increase in transmission rates. Progress is hampered technically by ever more arduous miniaturization and organizationally by ever more stringent security requirements. Leap innova...