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Silicon-vacancy and tin-vacancy defects in diamond are of interest asalternative qubits to the NV center due to their superior optical properties.While the availability of optical transitions in these defects is one of theirassets, high-fidelity optical coherent control has not been demonstrated. Here,we design novel optical control schemes tailored to these defects. We evaluatethe performance of arbitrary single-qubit rotations of the electron spin qubitboth in the absence and presence of an external magnetic field, by taking intoaccount both coherent and incoherent errors. We find that rotations in excessof $98.0\%$ ($T=4$~K) and $99.71\%$ ($T=6$~K) can be achieved for Si-V and Sn-Vrespectively in the presence of realistic relaxation and leakage errors.

Optical control protocols for high-fidelity spin rotations of single SiV$^{-}$ and SnV$^{-}$ centers in diamond