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A biexciton in a semiconductor quantum dot is a source ofpolarization-entangled photons with high potential for implementation inscalable systems. Several approaches for non-resonant, resonant andquasi-resonant biexciton preparation exist, but all have their owndisadvantages, for instance low fidelity, timing jitter, incoherence orsensitivity to experimental parameters. We demonstrate a coherent and robusttechnique to generate a biexciton in an InGaAs quantum dot with a fidelityclose to one. The main concept is the application of rapid adiabatic passage tothe ground state-exciton-biexciton system. We reinforce our experimentalresults with simulations which include a microscopic coupling to phonons.

Coherent and robust high-fidelity generation of a biexciton in a quantum dot by rapid adiabatic passage