Spatial and Hyperfine Characteristics of SiV.sup.- and SiV.sup.0 Color Centers in Diamond: DFT Simulation

One of the most promising platforms to implement quantum technologies are coupled electron-nuclear spins in diamond in which the electrons of paramagnetic color centers play a role of "fast" qubits, while nuclear spins of nearby .sup.13C atoms can store quantum information for a very long time due to their exceptionally high isolation from the environment. Essential prerequisite for a high-fidelity spin manipulation in these systems with tailored control pulse sequences is a complete knowledge of hyperfine interactions. Development of this understanding for the negatively charged "silicon-vacancy" (SiV.sup.-) and neutral (SiV.sup.0) color center, is a primary goal of this article, where we are presenting shortly our recent results of computer simulation of spatial and hyperfine characteristics of these SiV centers in H-terminated cluster C.sub.128[SiV]H.sub.98 along with their comparison with available experimental data.