Correlated spontaneous emission of a single photon from a uniformly excited cloud of N atoms - Marlan Scully

We study the correlated spontaneous emission from a dense spherical cloud of N atoms uniformly excited by absorption of a single photon. We find that the coupled atom-radiation system oscillates between the collective Dicke state (with no photons) and the atomic ground state (with one photon) with frequency Ω while decaying at a rate c/R; thus providing us with a new kind of cavity QED.