Large scale quantum networks are envisioned for secure quantum communication between any two points on earth and for the creation of various cryptographic protocols. Quantum networks are also a model for distributed quantum computing. Quantum emitters featuring spin-photon interfaces and quantum memories are crucial elements in the nodes of such networks. Non-classical states of light, such as single and entangled photons, are also critical for novel quantum technologies. Key questions are therefore how to control the nodes of these networks and how to produce the desired photonic states. I will give and overview of the field and present our work focusing on the control of spins and the deterministic generation of highly entangled photonic states from spinful quantum emitters such as color centers and semiconductor quantum dots.