How to observe single photons at 200 000 camera frames per second

A significant part of quantum-optical research and technology relies on the ability to detect single photons. In particular, multimode non-classical states of light, representing high-dimensional qudits, open new avenues in near-term applications [1] as well as fundamental research [2] . Single-photon sensitive cameras are a very flexible way to detect weak spatially-multimode light, especially when the number of modes is very high [3] . On the other hand, their efficiency and acquisition speed is often relatively low.