  Optically active spins in solid-state systems can be engineered to emit
photons that are entangled with the spin in the solid. This allows for
applications such as quantum communications, quantum key distribution, and
distributed quantum computing. Recently, there has been a strong interest in
silicon carbide defects, as they emit very close to the telecommunication
wavelength, making them excellent candidates for long range quantum
communications. In this work we develop explicit schemes for spin-photon
entanglement in several SiC defects: the silicon monovacancy, the silicon
divacancy, and the NV center in SiC. Distinct approaches are given for (i)
single-photon and spin entanglement and (ii) the generation of long strings of
entangled photons. The latter are known as cluster states and comprise a
resource for measurement-based quantum information processing.
