Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 33: Quantum Dots: Optical Properties I

HL 33.2: Vortrag

Dienstag, 21. März 2017, 10:00–10:15, POT 81

Non-linear two-photon resonance fluorescence of a single artificial atom — •Jonathan Müller, Lukas Hanschke, Per-Lennart Ardelt, Manuel Koller, Tobias Simmet, Alexander Bechtold, Kai Müller, and Jonathan Finley — Walter Schottky Institut, TU-München, 85748 Garching, Germany

Resonance fluorescence that arises from the interaction of a coherent light field with a two level system, has led to the development of numerous physical breakthroughs in atomic quantum optics. Increasing the complexity of the physical systems, first predictions for a non-linear counterpart of resonance fluorescence were made theoretically already 30 years ago.

We present non-linear resonance fluorescence studies for the two-photon excitation of individual semiconductor quantum dots. Monitoring the population evolution for increasing Rabi frequencies we observe an s-shaped behavior as a clear signature of the non-linear excitation process. Quantum optical simulations based on a 4-level system provide excellent agreement with the measurements and reveal the crucial role of the environmental coupling to LA-phonons which leads to a redistribution of the population between the levels. Finally, we directly measure the formation of dressed states in the non-linearly driven system that emerge from the resonant two-photon interaction between the coherent light field and the 4-level artificial atom. Our results open the route for investigating a range of optical phenomena from entangled photon pairs to photon bundles resulting from the coherent non-linear interaction in two-photon resonance fluorescence.