Light-matter interactions define the fundamental phenomena of photon emission and scattering. By harnessing these processes for deterministic creation and manipulation of photon states, one can realize efficient quantum information processing. This motivates active theoretical and experimental research on quantum emitters in waveguide platforms, which offers several key benefits. First, the photon-emitter coupling increases due to strong light confinement in a waveguide. Second, specially engineered photonic-crystal waveguides support chiral interactions, which are sensitive to the direction of the photon propagation. These features can enable the realization of single-photon diodes, transistors, and deterministic quantum gates, and their integration into complex photonic circuits.

The paper by S. Mahmoodian et al. predicts that chiral light-matter interactions can be further enhanced in glide-plane symmetric photonic-crystal waveguides operating in the regime of slow light with the group velocity reduced by two orders of magnitude. Numerical simulations demonstrate that near-perfect directionality is achievable for a range of emitter positions and frequencies, which can benefit next generation experiments.

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