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Semiconductor-based emitters of pairwise photonic entanglement are apromising constituent of photonic quantum technologies. They are known for theability to generate discrete photonic states on-demand with low multiphotonemission, near-unity entanglement fidelity, and high single photonindistinguishability. However, quantum dots typically suffer from luminescenceblinking, lowering the efficiency of the source and hampering their scalableapplication in quantum networks. In this paper, we investigate and adjust theintermittence of the neutral exciton emission in a GaAs/AlGaAs quantum dotunder two-photon resonant excitation of the neutral biexciton. We investigatethe spectral and quantum optical response of the quantum dot emission to anadditional wavelength tunable gate laser, revealing blinking caused by theintrinsic Coulomb blockade due to charge capture processes. Our findingdemonstrates that the emission quenching can be actively suppressed bycontrolling the balance of free electrons and holes in the vicinity of thequantum dot and thereby significantly increasing the quantum efficiency by 30%.

Photoneutralization of charges in GaAs quantum dot based entangled photon emitters