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FM: Fall Meeting

FM 30: Quantum Sensing: Applications I

FM 30.6: Talk

Dienstag, 24. September 2019, 15:30–15:45, Aula

Analyzing semiconductor quantum dot under mechanical strain tuning — •Marco Schmidt, Marcel Darmstädter, Sarah Fischbach, Arsenty Kaganskiy, Sven Rodt, Tobias Heindel, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany

Advanced applications of quantum information processing require sources of single, indistinguishable photons as well as polarization entangled photon pairs as key building blocks. Semiconductor quantum dots (QPs) are excellent single-photon emitters and accomplish these requirements. The spectral properties, e.g. emission energy, fine structure splitting and binding energy, of QPs determined by the self-assembled growth and and can be manipulated by applying external mechanical strain. We demonstrate a tunable single-photon source based on an InGaAs QD inside a thin GaAs membrane that is bounded to a piezoactuator via the flip-chip goldbonding technique. Optical and quantum optical studies of the system will be presented which include the stabilization of the QD emission energy, tuning of the fine structure splitting and quantum tomographic measurements to demonstrate the emission polarization entangled photon pairs.