How to select quantum dots with smallest fine structure splitting under uniaxial stress for entangled photon sources

We propose a microscopic theory to build an exact relationship between the fine structure splitting (FSS) of exciton, the polarization of the emission lines and the amount of asymmetry in self-assembled quantum dots (QDs). Based on our model, strategy to select QDs with smallest FSS from large amount of QDs is proposed. The predilection in this work is supported by million atom empirical pseudo-potential calculation. Our theory can greatly simply the method to generate entangled photon sources using single QD.