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Eliminating the fine structure splitting (FSS) of excitons in self-assembledquantum dots (QDs) is essential to the generation of high quality entangledphoton pairs. It has been shown that the FSS has a lower bound under uniaxialstress. In this letter, we show that the FSS of excitons in a generalself-assembled InGaAs/GaAs QD can be fully suppressed via combined stressesalong the [110] and [010] directions. The result is confirmed by atomicempirical pseudopotential calculations. For all the QDs we studied, the FSS canbe tuned to be vanishingly small ($<$ 0.1 $\mu$eV), which is sufficient smallfor high quality entangled photon emission.

Conquer the fine structure splitting of excitons in self-assembled InAs/GaAs quantum dots via combined stresses