  Collective radiance is a fundamental phenomenon in quantum optics. However,
these radiation effects remain largely unexplored in the field of quantum
acoustics. In this work, we investigate the supercorrelated radiation effects
in a nonlinear phononic waveguide that is coupled with NV centers. When the
spin's frequency is below the scattering continuum but within the bound-state
band of the phonon waveguide, a single NV center dissipates slowly, but two NV
centers can exhibit a rapid exponential decay. When multiple NV spins are
considered, supercorrelated radiance occurs at a rate N times faster than Dicke
superradiance. The peak of the state distribution in supercorrelated radiance
jumps directly from $|m=N/2\rangle$ to $|m=-N/2\rangle$, distinguished from the
continuous shift of the peak in superradiance. This work provides deeper
insight into the collective radiation effect and may find interesting
applications in quantum information processing.
