Important quantum optical properties of integrated quantum dots like, e.g., the spontaneous emission rate enhancement, rely heavily on the spatial position inside nanophotonic structures. In order to assure a high quantum yield of the device, precise optical positioning of the quantum dots across the whole chip is necessary and should be optimized by you. Especially experience with Python will be helpful for this task.

Fabricated photonic nanostructures have to be optically characterized with regard to their efficiency-wavelength dependence and their polarization-dependent properties. Your tasks will include building an optical setup, controlling/automizing the measurement equipment and analyzing the results.

Realizing elaborate semiconductor quantum devices requires efficient spectroscopic characterization. Micro-photoluminescence measurements are performed to obtain spectral information in dependence of laser power and wavelength, sample position or the emitted polarization. Your task will be to fully automate these measurements in a python based laboratory management framework.

Novel hybrid devices based on piezoelectric substrates to nanophotonic structures are the motivation for this project. Such devices require the bonding of large semiconductor-nanomembranes with piezoelectric actuators. Your task will be to investigate wet chemical etching processes in the cleanroom, which will ultimately enable the fabrication of the envisioned structures.

Novel semiconductor photonic nanostructures (e.g. 2D topological resonators) are of great interest in research since they can boost quantum optical properties of integrated single-photon emitters. You will be working in a cleanroom environment with the latest fabrication facilities including electron beam lithography and reactive ion etching.

Novel nanophotonic quantum devices based on semiconductor quantum dots need to be understood theoretically to provide starting parameters for the experiments. Your task will be to perform Finite-Difference Time Domain (FDTD) simulations of these nanostructures with the state-of-the-art simulation software Lumerical for that goal.

Semiconductor quantum dots are excellent sources of non-classical light. To investigate their quantum optical properties like photon anti-bunching or the entanglement fidelity will be central to your tasks. These include working in a state-of-the-art optical lab and automating/analyzing the obtained results.

In a joint effort with our partners at the PTB (Braunschweig), a fiber testbed between the two cities is being set up for quantum communication purposes. Your task will be to understand the critical parameters in quantum key distribution experiments and to develop methods for analyzing the future experimental data using Python.