Optimizing H1 cavities for the generation of entangled photon pairs

Abstract

We report on the theoretical investigation of photonic crystal cavities etched on a suspended membrane for the generation of polarization entangled photon pairs using the biexciton cascade in a single quantum dot. The implementation of the spontaneous emission enhancement effect increases the entanglement visibility, while the concomitant preferential funneling of the emission in the cavity mode increases the collection of both entangled photons. We demonstrate and quantify that standard cavity designs present a polarizationdependent emission diagram, detrimental to entanglement. The optimization of Hl cavities allows us to obtain both high collection efficiencies and polarizationindependent emission, while keeping the high Purcell factors necessary for high-quality entangled photon sources. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.