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.
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Zhang, Z., Fleury, R. A rendezvous with light. Nat. Photon. 19, 441–442 (2025). https://doi.org/10.1038/s41566-025-01664-7
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DOI: https://doi.org/10.1038/s41566-025-01664-7
