Quantum correlations in a semiconductor microcavity

Summary form only given. The nonlinear optical response of semiconductor microcavities in the nonperturbative regime has been the subject of many recent experiments. Contrary to clear demonstrations of the quantized nature of the vacuum-field Rabi splitting of a single atom, most of the experiments on semi-conductor microcavities could be explained in terms of a classical light field. Only recently, quantized light field effects have been reported in a coherent control experiment (Lee et al, 1999) and theoretically investigated in secondary emission (Kira et al, 1999). Here, results are presented that display a pronounced third transmission maximum lying energetically between the two normal modes. The third peak can be observed in resonant femtosecond single-beam as well as picosecond pump-probe experiments under various excitation conditions.