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We demonstrate the on-demand emission of polarisation-entangled photon pairsfrom the biexciton cascade of a single InAs quantum dot embedded in a GaAs/AlAsplanar microcavity. Improvements in the sample design blue shifts the wettinglayer to reduce the contribution of background light in the measurements.Results presented show that >70% of the detected photon pairs are entangled.The high fidelity of the (|HxxHx>+|VxxVx>)/2^0.5 state that we determine issufficient to satisfy numerous tests for entanglement. The improved quality ofentanglement represents a significant step towards the realisation of apractical quantum dot source compatible with applications in quantuminformation.

Improved fidelity of triggered entangled photons from single quantum dots