Study on electronic correlation and photon-pair generation with highly symmetric quantum dots by droplet epitaxy

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To clarify the electronic correlation of exciton complexes in lattice-matched quantum dots and to demonstrate the entangled photon-pair generation by cascade emission from their biexciton states, we performed self-assembly of quantum dots by droplet epitaxy, photon-correlation measurement by single-dot spectroscopy, and theoretical analysis of exciton states by the configuration interaction method. We succeeded in fabricating highly symmetric GaAs quantum dots on AlGaAs(111)A substrates by the droplet epitaxy and generating entangled photon pairs with the world highest fidelity of 86%. In addition, we extended the material system for the droplet epitaxy and succeeded in the fabrication of lattice-matched InAs quantum dots that have excitonic emission bands in the telecommunication wavelengths.