  We employ the quantum-jump approach to study single scatterings in single
semiconductor quantum dots. Two prototypical situations are investigated.
First, we analyze two-photon emissions from the cascade biexciton decay of a
dot where the single-exciton states exhibit a fine-structure splitting. We show
that this splitting results for appropriately chosen polarization filters in an
oscillatory behavior of two-photon correlations, and carefully examine the
proper theoretical description of the underlying scattering processes.
Secondly, we analyze the decay of a single-electron charged exciton in a
quantum dot embedded in a field effect structure. We show how the quantum
properties of the charged exciton are transferred through tunneling and
relaxation to the spin entanglement between electrons in the dot and contact,
and identify the pertinent disentanglement mechanisms.
