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Topological localization of photons in both space and time has now been experimentally realized through synthetic photonic quantum walks, enabled by non-Hermitian gain–loss modulations. This investigation into time and space-time topology reveals unique phenomena beyond conventional spatial topological effects, including causality-suppressed coupling.
Alexandre Schmid, Catherine Dehollain, Mohammad Javad Karimi, Yuxuan Zhou, Menghe Jin
Valerio Zerbi, Christina Maria Grimm