Emission characteristics of the resonance fluorescence of semiconductor quantum dots in microcavities

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The goal of the current research project is the investigation of the emission characteristics of self assembled InGaAs quantum dots (QDs) in microcavities under strictly resonant excitation. The main focus is set on the generation of indistinguishable photons from the emission of single quantum dots as well as particularly spatially remote QDs under continuous wave (cw) and pulsed coherent excitation. To achieve these goals, an efficient reduction of limiting ‘pure’ emission dephasing effects is anticipated by resonant excitation in combination with new methods to alter the relative spectral detuning between individual quantum dots and the cavity mode energy even at low temperatures. Complementary tuning techniques will be applied to controllably optimize and fine adjust the QD emission coherence properties individuallyand also between remote emitter structures. Especially for the regime of strong resonant excitation it is aimed to proof also the deterministic cascaded photon emission between the two Mollow triplet sidebands by photon correlation measurements under close to resonant pumping. Additional Hong-Ou-Mandel type interference studies are intended to explicitly determine the degree of photon indistinguishability on each individual Mollow emission sideband. The above explained research activities represent important and necessary steps towards the realization of numerous quantum-optical information technological concepts, for which the deterministic generation of indistinguishable photons is a fundamental requirement.