Latest work: Two papers on fusion categories and CFTs


Computing associators of endomorphism fusion categories

with Daniel Barter and Jacob Bridgeman

A critical lattice model for a Haagerup conformal field theory

with Robijn Vanhove, Laurens Lootens, Maarten Van Damme, Tobias Osborne, Jutho Haegeman, and Frank Verstraete

Latest work: Book on Quantum Key Distribution


I have published a book!

This book is an introduction to quantum key distribution, equipped with many examples and exercises. It grew out of a lecture I had given in the Summer term 2020 on this subject (which can be found here).

The book is part of the series „Lecture Notes in Physics“ by Springer. You can also read it on SpringerLink.

Latest news: Article on Quantum Cryptography


I have written an article about quantum cryptography as part of a Springer campaign on quantum communication and quantum tecnology.

Latest news: Publication in Nature Communications


Our paper on „Device-independent quantum key distribution with random key basis“ (joint work with R. Schwonnek, K. T. Goh, I. W. Primaatmaja, E. Y.-Z. Tan, V. Scarani, and C. C.-W. Lim) is now published in Nature Communications!

You can find it here: Nature Communications 12, 2008 (2021)

Latest news: I finished my PhD!


After successfully defending my PhD thesis, I am now officially a Doctor!

You can find my thesis on „Microscopic Models for Fusion Categories“ on the arXiv: 2101.04154

Latest work: Robust Device-Independent Quantum Key Distribution


Joint work with René Schwonnek, Koon Tong Goh, Ignatius W. Primaatmaja, Ernest Y.-Z. Tan, Valerio Scarani, and Charles C.-W. Lim

arXiv: 2005.02691

Device-independent quantum key distribution (DIQKD) is the art of using untrusted devices to distribute secret keys in an insecure network. It thus represents the ultimate form of cryptography, offering not only information-theoretic security against channel attacks, but also against attacks exploiting implementation loopholes. In recent years, much progress has been made towards realising the first DIQKD experiments, but current proposals are just out of reach of today’s loophole-free Bell experiments. In this work, we close the gap between the theory and practice of DIQKD with a simple variant of the original protocol based on the celebrated Clauser-Horne-Shimony-Holt (CHSH) Bell inequality. In using two randomly chosen key generating bases instead of one, we show that the noise tolerance of DIQKD can be significantly improved. In particular, the extended feasibility region now covers some of the most recent loophole-free CHSH experiments, hence indicating that the first realisation of DIQKD already lies within the range of these experiments.