Cryptography-based security solutions heavily rely on cryptographic primitives such as encryption and signature schemes. However, existing primitives are threatened by attacks which are made possible by new computing architectures and algorithms. Also, new cryptographic solutions require efficient primitives with new functionalities such as fully homomorphic encryption. Thus, the goal of this project area is the development of the required cryptographic primitives. They must be efficient in present and future computing environments, and must resist novel attacks due to new hardware platforms and algorithmic advances.

P4 - Quantum Key Hubs

Quantum key distribution (QKD) hallmarks a new generation of cryptographic primitives whose security is based on the validity of fundamental laws of physics. The goal of this project is to develop a photon-based multipartite QKD structure in a star like topology and to explore its fundamental quantum features both experimentally and theoretically. The realization of such multipartite QKD structures constitutes an essential step towards the realization of QKD networks for next generation quantum information processing.


Erik Fitzke

Laser und Quantenoptik


  • Quantum optics
  • Optical Communication
  • Quantum key distribution

Oleg Nikiforov

Laser und Quantenoptik


  • Quantum key distribution experiments.
  • Single photon sources.
  • Optical communication.

Thorsten Haase

Theoretical Quantum Physics

  • Quantum optics
  • Quantum communication
  • Theory of laser cooling

Alexander Sauer

Theoretical Quantum Physics

  • Quantum key distribution protocols
  • Probability polytopes
  • Quantum correlations



CROSSING Publications P4

Additional Attributes


Side-Channel Analysis of Privacy Amplification in Postprocessing Software for a Quantum Key Distribution System

Oleg Nikiforov, Alexander Sauer, Johannes Schickel, Alexandra Weber, Gernot Alber, Heiko Mantel, Thomas Walther
January 2018

SFB 1119 - Contact

Contact P4

Gernot Alber
Institut für Angewandte Physik
Hochschulstraße 4a
64289 Darmstadt

Thomas Walther
Laser und Quantenoptik
Institut für Angewandte Physik Fachbereich 05 - Physik
Technische Universität Darmstadt
Schlossgartenstr. 7
64289 Darmstadt


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