Michał Karpiński

Quantum key distribution (QKD) has emerged as a leading solution to meet the increasing need for secure communication systems in the light of potential threads posed by advancements in quantum computing. Recent developments include multiple works on high-dimensional QKD systems, which outperform qubit-based solutions in terms of ro- bustness and theoretically-achievable key rates. However, such systems are more compli- cated and expensive. In this work we overcome those issues by using only one single photon detector per measurement basis. We show that high-dimensional QKD symbols can be de- tected using a single time-resolved photon detector with the Talbot effect. We report on the theoretical limitations of our method and present experimentally-obtained key rates for the two-dimensional and four-dimensional case.