  In this chapter, we present the state-of-the-art in the generation of
nonclassical states of light using semiconductor cavity quantum electrodynamics
(QED) platforms. Our focus is on the photon blockade effects that enable the
generation of indistinguishable photon streams with high purity and efficiency.
Starting with the leading platform of InGaAs quantum dots in optical
nanocavities, we review the physics of a single quantum emitter strongly
coupled to a cavity. Furthermore, we propose a complete model for photon
blockade and tunneling in III-V quantum dot cavity QED systems. Turning toward
quantum emitters with small inhomogeneous broadening, we propose a direction
for novel experiments for nonclassical light generation based on group-IV
color-center systems. We present a model of a multi-emitter cavity QED
platform, which features richer dressed-states ladder structures, and show how
it can offer opportunities for studying new regimes of high-quality photon
blockade.
