Phonon-induced multi-color correlations in hBN single-photon emitters*

Color centers in hexagonal boron nitride have shown enormous promise as single-photon sources,
but a clear understanding of electron-phonon interaction dynamics is critical to their development
for quantum communications or quantum simulations. We demonstrate photon antibunching in the
filtered auto- and cross-correlations between zero-, one- and two-phonon replicas of defect
luminescence. With no background correction, we observe
single photon purity of 80% in a phonon replica and cross-spectral correlations of 82% between a phonon replica and the zero phonon line. We will discuss the feasibiltiy of quantum phononics via further exploration of the density of states for phononic cavities coupled to single quantum emitters in 2D materials .