TUM/MCQST photonic crystal waveguide breakthrough triples useful photon output for quantum networks

Researchers at TUM/MCQST demonstrate photonic crystal waveguides that increase useful single-photon output from 23% to 72% by filtering out unwanted emission. Erbium integration with existing fiber optics suggests near-term commercial potential. Could lead to a future TUM spinout in quantum photonics. Confirmed by article on Aug 17, 2026.