Strongly correlated photon transport in waveguide QED with weakly coupled emitters

Understand

We show that strongly correlated photon transport can be observed in waveguides containing optically dense ensembles of emitters.

• Remarkably, this occurs even for weak coupling efficiencies.
• Specifically, we compute the photon transport properties through a chirally coupled system of $N$ two-level systems driven by a weak coherent field, where each emitter can also scatter photons out of the waveguide.
• The photon correlations arise due to an interplay of nonlinearity and coupling to a loss reservoir, which creates a strong effective interaction between transmitted photons.