Collective radiance with NV centers coupled to nonlinear phononic waveguides

TL;DR

This paper explores collective radiance phenomena in quantum acoustics by studying NV centers coupled to nonlinear phononic waveguides, revealing supercorrelated radiance with potential quantum information applications.

Contribution

It introduces the concept of supercorrelated radiance in NV centers coupled to nonlinear phononic waveguides, a novel quantum acoustics phenomenon.

Findings

Supercorrelated radiance occurs at a rate N times faster than Dicke superradiance.

The state distribution peak jumps directly from |m=N/2> to |m=-N/2>.

Single NV centers dissipate slowly within the bound-state band.

Abstract

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.