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To generate entangled photon pairs via quantum dots (QDs), the exciton finestructure splitting (FSS) must be comparable to the exciton homogeneous linewidth. Yet in the (In,Ga)As/GaAs QD, the intrinsic FSS is about a few tens$\mu$eV. To achieve photon entanglement, it is necessary to Cherry-pick asample with extremely small FSS from a large number of samples, or to applystrong in-plane magnetic field. Using theoretical modeling of the fundamentalcauses of FSS in QDs, we predict that the intrinsic FSS of InAs/InP QDs is anorder of magnitude smaller than that of InAs/GaAs dots, and better yet, theirexcitonic gap matches the 1.55 $\mu$m fiber optic wavelength, therefore offerefficient on-demand entangled photon emitters for long distance quantumcommunication.

Highly-reduced Fine-structure splitting in InAs/InP quantum dots offering efficient on-demand 1.55 $\mu$m entangled photon emitter