The research area “Functional structures” contains projects aiming for specific nonlinear functi- onalities, which will be obtained from integrated quantum optical circuits (C01, C02) or engineered, coherent optoelectronic structures (C03, C04).
The aim of project C01 is the engineering of LiNbO3-based converters for frequency translation and the full control of the temporal-spectral shape and structure of pulsed quantum light, which will cons- titute an important step towards future quantum communication systems. In C02 a fully integrated LiNbO3 based quantum optical circuit will be developed, which is comprised of a parametric down-conver- sion source and a two-photon interferometer. The demonstration of quantum interference of two single photon states lies at the heart of linear optical quantum computation.
The projects C03 and C04 are focused on electric field tunable quantum dot structures. In C04 the emphasis lies on the control of exciton transitions by picosecond electric switching, which appears synchronously to the coherent picosecond laser excitation. Project C03 is focused on nonlinear op- tical effects in quantum dot molecules, which can be tuned and charged on the single electron level by an electric field along the molecule axis.