Wigner function and decoherence in a microcavity-Qdot system

The relation between the master equation and the Wigner function to characterize the dissipative system dynamics (evolution, mixedness and decoherence) between a three-level quantum-dot system coupled with two light modes in a semiconductor microcavity is analyzed. In particular, it is shown that the dephasing processes increase the decoherence driving the system from the strong coupling to the weak coupling regime.