Quantum mechanics allows for the establishment of private communications that no third parties can secretly intercept. The security of communications is guaranteed by entanglement, a purely quantum property that can be distributed over large distances using photons. Photon loss due to absorption or inefficient detection is hardly differentiable from eavesdropping. One way to still guarantee unconditional security is to interface photons with spins. Using such spin-photon interfaces, one can measure information via the spin state with 100% efficiency and entangle over large distances using photons. In my experiments, I have developed a fast primitive version of such a quantum network and in this talk, I will be giving an introduction to this exciting field of research.