Superradiance

When an ensemble of atoms coherently shares an excitation, the collective atom-field coupling may become more efficient due to interference effects. This phenomenon is known as superradiance.

Resonance energy transfer

CP potential for atomic ensemble

Collective dipole:

^{S. Bang, R. Bennett, S.Y. Buhmann, arXiv quant-ph 1912.05892 (2019)}

^{S. Fuchs, S.Y. Buhmann, Europhys. Lett. 124, 3 (2018)}