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It is demonstrated how the exciton and the biexciton state of a quantum dotcan be prepared with high fidelity on a picosecond time-scale by driving thedot with a strong laser pulse that is tuned above the exciton resonance forexciton preparation and in resonance with the exciton transition for biexcitonpreparation. The proposed schemes make use of the phonon-induced relaxationtowards photon dressed states in optically driven quantum dots and combine thesimplicity of Rabi flopping with the robustness of adiabatic rapid passageschemes. Our protocols allow for an on-demand, fast and almost perfect statepreparation even at strong carrier-phonon interaction where other schemes fail.In fact, the performance of the presented protocols is shown to be the betterthe stronger the carrier-phonon interaction is.

Proposed robust and high-fidelity preparation of excitons and biexcitons in semiconductor quantum dots making active use of phonons