GaAs integrated quantum photonics: Towards dense and fully-functional   quantum photonic integrated circuits
  The recent progress in integrated quantum optics has set the stage for the development of an integrated platform for quantum information processing with photons, with potential applications in quantum simulation. Among the different material platforms being investigated, direct-bandgap semiconductors and particularly gallium arsenide (GaAs) offer the widest range of functionalities, including single- and entangled-photon generation by radiative recombination, low-loss routing, electro-optic modulation and single-photon detection. This paper reviews the recent progress in the development of the key building blocks for GaAs quantum photonics and the perspectives for their full integration in a fully-functional and densely integrated quantum photonic circuit. 
Christof P. Dietrich, Andrea Fiore, Mark G. Thompson, Martin Kamp, and   Sven H\"ofling
cond-mat.mes-hall quant-ph