  Color centers in hexagonal boron nitride (hBN) show stable single photon
emission even at room temperature, making these systems a promising candidate
for quantum information applications. Besides this remarkable property, also
their interaction with longitudinal optical (LO) phonons is quite unique
because they lead to dominant phonon sidebands (PSBs), well separated from the
zero phonon line (ZPL). In this work we utilize this clear spectral separation
to theoretically investigate the influence of phonon decay dynamics on
time-dependent photoluminescence (PL) signals. Our simulations show, that by
using tailored optical excitation schemes it is possible to create a
superposition between the two LO modes, leading to a phonon quantum beat that
manifests in the time-dependent PL signal.
