  We demonstrate a new method for generating triggered single photons. After a
laser pulse generates excitons inside of a single quantum dot, electrostatic
interactions between them and the resulting spectral shifts allow a single
emitted photon to be isolated. Autocorrelation measurements show a reduction of
the two-photon probability to 0.12 times the value for Poisson light. Strong
anti-bunching persists when the emission is saturated. The emitted photons are
also polarized.
