  The unpredictability of a single quantum event lies at the very core of
quantum mechanics. Physical information is therefore drawn from a statistical
evaluation of many such processes. Nevertheless, recording each single quantum
event in a time trace the "random telegraph signal" is of great value, as it
allows insight into the underlying physical system. Here, quantum dots have
proven to be well suited systems, as they exhibit both single photon emission
and single electron charge transport. While single photon emission is generally
studied on self-assembled quantum dots, single electron transport studies are
focused on gate-defined structures. We investigate, on a single self-assembled
quantum dot, the single electron transport in the optical telegraph signal with
high bandwidth and observe in the full counting statistics the interplay
between charge and spin dynamics in a noninvasive way. In particular, we are
able to identify the spin relaxation of the Zeeman-split quantum-dot level in
the charge statistics.
