In(Ga)As quantum dots on GaAs are very attractive candidates to confine single excitons and single spins serving as solid state qubits in a mature semiconductor platform. Quantum dots can be implemented to efficiently generate single photons or entangled photon pairs on demand. Light-matter interaction in coupled quantum dot-cavity systems can be largely controlled by embedding the quantum dots into microcavities. Within this talk we present recent advances in our semiconductor fabrication technology, and outline how one can utilize it for quantum information processing building blocks, like single photon sources or coherently controlled spin memories and light-matter interfaces .Furthermore, we report on enhanced emission of single photons by quantum dots into photonic crystal waveguide structures.