Quantum correlations and intraband coherences in semiconductor cavity QED

A fully quantized theory of optical interactions with semiconductors reveal s quantum correlations between the field and carrier density. These quantum correlations lead to intraband coherences which live much longer than the interband dephasing time; the correlations are observed as oscillations in the time-resolved reflectivity in a pump-probe experiment on a normal-mode microcavity. Coherent control of the microcavity normal modes using phase-l ocked pump pulses enables considerable enhancement of the intraband oscilla tions due to quantum interference; the detailed phase dependence is well re produced by the theory.