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Coherent quantum systems are a key resource for emerging quantum technology.Solid-state spin systems are of particular importance for compact and scalabledevices. However, interaction with the solid-state host degrades the coherenceproperties. The negatively-charged silicon vacancy center in diamond is such anexample. While spectral properties are outstanding, with optical coherenceprotected by the defects symmetry, the spin coherence is susceptible to rapidorbital relaxation limiting the spin dephasing time. A prolongation of theorbital relaxation time is therefore of utmost urgency and has been tackled byoperating at very low temperatures or by introducing large strain. However,both methods have significant drawbacks, the former requires use of dilutionrefrigerators and the latter affects intrinsic symmetries. Here, a novel methodis presented to prolong the orbital relaxation with a locally modified phonondensity of states in the relevant frequency range, by restricting the diamondhost to below 100 nm. The method works at liquid Helium temperatures of fewKelvin and in the low-strain regime.

Prolonged orbital relaxation by locally modified phonon density of states for SiV$^-$ center in nanodiamonds