  The goal of integrated quantum photonics is to combine components for the
generation, manipulation, and detection of non-classical light in a phase
stable and efficient platform. Solid-state quantum emitters have recently
reached outstanding performance as single photon sources. In parallel, photonic
integrated circuits have been advanced to the point that thousands of
components can be controlled on a chip with high efficiency and phase
stability. Consequently, researchers are now beginning to combine these leading
quantum emitters and photonic integrated circuit platforms to realize the best
properties of each technology. In this article, we review recent advances in
integrated quantum photonics based on such hybrid systems. Although hybrid
integration solves many limitations of individual platforms, it also introduces
new challenges that arise from interfacing different materials. We review
various issues in solid-state quantum emitters and photonic integrated
circuits, the hybrid integration techniques that bridge these two systems, and
methods for chip-based manipulation of photons and emitters. Finally, we
discuss the remaining challenges and future prospects of on-chip quantum
photonics with integrated quantum emitters.
