Front Cover: Fast Quantifier of High‐Dimensional Frequency Entanglement through Hong–Ou–Mandel Interference (Adv. Quantum Technol. 6/2023)

Fast quantifier of high‐dimensional entanglement is an essential prerequisite for quantum technologies. In article number 2300012 by Yuanyuan Chen, Lixiang Chen, and co‐workers, Hong–Ou–Mandel experiment is exploited to perform a Fourier transform between the entangled photons in terms of joint spectral intensities and the quantum interference in terms of biphoton temporal coincidences. This method unlocks the concept of Shannon dimensionality for characterizing the high‐dimensional entanglement nature by avoiding some stringent conditions.