Advances in solid-state quantum information processing turned to have a large impact on other fields of physics, thanks to the numerous entanglement based processes and protocols that were worked out in recent years. In this seminar, we consider such a process, the optical dynamic nuclear spin polarization (ODNP) process, which may become an important part of future quantum information processing, nanoscale metrology, and sensitivity-enhanced nuclear magnetic resonance applications.
Briefly, we first shortly review the physics of important paramagnetic point defects in semiconductors that serve as optically addressable solid-state quantum bits. We consider the optical electron spin polarization cycle, heterogeneous electron - nuclear spin systems, and the possibility of spin polarization transfer via the hyperfine interaction. Then, we review ODNP and introduce a general model allows us to understand different aspects of this process. Finally, we discuss recent results on the ground state ODNP of weakly coupled nuclei.
 A. L. Falk et al, Phys. Rev. Lett. 114, 247603 (2015).
 V. Ivády et al, Phys. Rev. B 92, 115206 (2015).