About Me

My research revolves around communication in quantum networks and quantum cryptography, investigating how quantum information can provide secure — and occasionally anonymous — communication. I'm particularly interested in developing quantum communication protocols, efficient entanglement routing in networks, and the rich world of quantum graph states.

Research Interests

  • Quantum Networks & Communication
  • Quantum Cryptography
  • Graph State Theory

      Frederik Hahn smiling and wearing a black jacket

      Current Research Projects

      QIA

      For the Quantum Internet Alliance I am currently developing quantum internet use cases as part of the Use Case Team, funded by the European Commission.

      QCyber

      From April 2026 onwards I will work on the QCyber project, funded by the Bundesministerium für Forschung, Technologie und Raumfahrt (BMFTR) / Federal Ministry of Research, Technology and Space.

          Publications

          Below you can find a list of my peer-reviewed publications, ordered chronologically.

          Distinguishing graph states by the properties of their marginals

          L. Vandré, J. de Jong, F. H., A. Burchardt, O. Gühne, A. Pappa

          Physical Review A, 2025

          DOI arXiv

          The foliage partition: An easy-to-compute LC-invariant for graph states

          A. Burchardt, F. H.

          Quantum, 2025

          DOI arXiv

          Extracting GHZ states from linear cluster states

          J. de Jong, F. H., N. Tcholtchev, M. Hauswirth, A. Pappa

          Physical Review Research, 2024

          DOI arXiv

          Faithfully simulating near-term quantum repeaters

          J. Wallnöfer, F. H., F. Wiesner, N. Walk, J. Eisert

          PRX Quantum, 2024

          DOI arXiv

          Anonymous conference key agreement in linear quantum networks

          J. de Jong, F. H., J. Eisert, N. Walk, A. Pappa

          Quantum, 2023

          DOI arXiv

          Experimental anonymous conference key agreement using linear cluster states

          L. Rückle, J. Budde, J. de Jong, F. H., A. Pappa, S. Barz

          Physical Review Research, 2023

          DOI arXiv

          Quantum Networks

          F. H.

          Ph.D. Thesis, Freie Universität Berlin, 2022

          DOI

          Limitations of nearest-neighbor quantum networks

          F. H., A. Dahlberg, J. Eisert, A. Pappa

          Physical Review A, 2022

          DOI arXiv

          Secure anonymous conferencing in quantum networks

          F. Grasselli, G. Murta, J. de Jong, F. H., D. Bruß, H. Kampermann, A. Pappa

          PRX Quantum, 2022

          DOI

          Simulating quantum repeater strategies for multiple satellites

          J. Wallnöfer, F. H., M. Gündoğan, J. S. Sidhu, F. Wiesner, N. Walk, J. Eisert, J. Wolters

          Communications Physics, 2022

          DOI arXiv

          Anonymous and secret communication in quantum networks

          C. Thalacker, F. H., J. de Jong, A. Pappa, S. Barz

          New Journal of Physics, 2021

          DOI arXiv

          Anonymous quantum conference key agreement

          F. H., J. de Jong, A. Pappa

          PRX Quantum, 2020

          DOI arXiv

          Quantum network routing and local complementation

          F. H., A. Pappa, J. Eisert

          npj Quantum Information, 2019

          DOI arXiv