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.


Sabine Euler

Laser und Quantenoptik


  • Quantum key-exchange experiments.
  • Single photon sources.
  • Interference experiments with single photons.

Oleg Nikiforov

Laser und Quantenoptik


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

Dr. Mauricio Torres

Theoretical Quantum Physics


  • Quantum information.
  • Open quantum systems.
  • Decoherence.
  • Cavity QED.
  • Quantum optomechanics.

Nils Trautmann

Theoretical Quantum Physics


  • Quantum optics.
  • Quantum communication.
  • Quantum information theory.



CROSSING Publications P4

Additional Attributes


Vorbereitende Arbeiten zum Feldtest eines Systems zum Quantenschlüsselaustausch

Benedikt Langfeld
July 2017
[Thesis (Master, Bachelor, Diploma)]

Will a Decaying Atom Feel a Friction Force?

Nils Trautmann, Matthias Sonnleitner, Stephen Barnett
In: Physical Review Letters, February 2017

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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