Abstract
Polarization properties of single photons emitted by optical pumpingfrom a single quantum dot (QD) are studied by using a four-level systemmodel. The model is capable of explaining the polarization uncertaintyobserved in single photon emission experiments. It is found that thedependence of photon emission efficiency and polarization visibility onpump power are opposite in general cases. By employing QDs with smallsize and strong carrier confinement, the photon polarization visibilityunder high pump power can be improved. In addition, embedding a QD intoa well designed microcavity is also found to be favourable, whereas thetrade-off between high polarization visibility and multi-photonemission is noted.
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