Entangled light from driven dissipative microcavities

We study the generation of entangled light in planar semiconductor microcavities. The focus is on a particular pump configuration where the dissipative internal polariton dynamics leads to the emission of entangled light in a W state. Our study is based on the nonlinear equations of motion for the polariton operators derived within the dynamics-controlled truncation formalism. They include the losses through the cavity mirrors, the interaction with lattice vibrations, and the external laser driving in a Langevin approach. We find that the generated entanglement is robust against decoherence under realistic experimental conditions. Our results show that pair correlations in solid-state devices can be used to stabilize the nonlocal properties of the emitted radiation.