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Semiconductor quantum dots (QDs) have potential applications in quantuminformation processing due to the fact that they are potential on-demandsources of single and entangled photons. Generation of polarization-entangledphoton pairs was demonstrated using the biexciton-exciton radiative cascade.One obvious way to increase the number of quantum correlated photons that theQDs emit is to use higher-order multiexcitons, in particular the triexciton.Towards achieving this goal, we first demonstrate deterministic generation ofthe QD-confined triexciton in a well-definedcoherent state and then spectrallyidentify and directly measure a three-photon radiative cascade resulting fromthe sequential triexciton-biexciton-exciton radiative recombination.

Determinstic Generation of a Quantum Dot-Confined Triexciton and its Radiative Decay via Three-Photon Cascade