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We present quantum state tomography (QST) measurements on strain‐tuned self‐assembled InxGa1−xAs/GaAs quantum dots. By applying uniaxial stress we tune the fine structure splitting (FSS) of the exciton transition and investigate the change in the two‐photon polarization state (TPPS) of the quantum dot. We tune the FSS to a minimum value of 4.7 µeV. The density matrix of the TPPS indicates an onset...
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