Entanglement is an important resource for quantum technologies. There are many ways
quantum systems can be entangled, ranging from the two-qubit case to entanglement in …

Conference key agreement (CKA), or multipartite key distribution, is a cryptographic task
where more than two parties wish to establish a common secret key. A composition of …

Quantum key distribution (QKD) networks are promising to serve large numbers of users
with information-theoretic secure communication. In QKD networks, the detection-safe …

Quantum networks will enable the implementation of communication tasks with qualitative
advantages with respect to the communication networks known today. While it is expected …

Quantum conference key agreement (QCKA) allows multiple users to establish a secure key
from a shared multi-partite entangled state. In a quantum network, this protocol can be …

These lecture notes grew out of a course on quantum key distribution taught at Leibniz
Universität Hannover during the summer term of 2020 as part of the physics master's …

The transfer of quantum information through a noisy environment is a central challenge in
the fields of quantum communication, imaging and nanophotonics. In particular, high …

We present a stack model for breaking down the complexity of entanglement-based
quantum networks. More specifically, we focus on the structures and architectures of …

Quantum networks will provide multinode entanglement enabling secure communication on
a global scale. Traditional quantum communication protocols consume pair-wise …

Quantum networks are promising tools for the implementation of long-range quantum
communication. The characterization of quantum correlations in networks and their …