Effects of random alloy disorder, shape deformation, and substrate misorientation on the exciton lifetime and fine structure splitting of GaAs/AlxGa1−xAs (111) quantum dots

Optical gain and entanglement through dielectric confinement and electric field in InP quantum dots

“…However, the favorable conditions for entanglement are destroyed by the fine structure splitting (FSS) which is present in the intermediate exciton state and significantly affects the radiative cascade. Various approaches have been successfully employed to mitigate the FSS, including the application of suitable electric, 16 magnetic 17 or strain 18 as well as a combination of electric and strain fields, 19 engineering of QD size and composition 20,21 and controlling the growth process in order to produce highly symmetric QDs. 22 An alternative way which could help to overcome the FSS and lead to the generation of entangled photon pairs, involves the fine tuning of the biexciton binding energy to zero.…”