Entangled light via nonlinear vacuum-multiparticle interactions

We investigate the generation of a strongly entangled electromagnetic field through laser pumping a collection of N two-level atoms in a two-mode optical resonator. The vacuum-multiparticle interactions enhance the coupling of the atomic sample to the cavity modes facilitating the creation of entangled photons at higher frequencies. In the dispersive atom-cavity limit, one can obtain a steady-state output field consisting of tens of such photons per mode