Squeezing in semiconductor microcavities in the strong-coupling regime

We report squeezed light generation using four-wave mixing in semiconductor microcavities in the strong coupling regime. The geometry of the experiment corresponds to degenerate four-wave mixing, which gives rise to a bistability threshold. Spatial effects in the nonlinear regime are evidenced, and spatial filtering is required in order to optimize the measured squeezing which is observed close to the bistability turning point. By measuring the noise of the outgoing light, we infer a $6%$ squeezing on the internal mode field which is a part-light, part-matter field.