Photonic entanglement generation from a single atom (M.Sc. Philip Thomas) / Real-space detection and manipulation of topological edge modes with ultracold atoms (M.Sc. Christoph Braun)

Photonic entanglement generation from a single atom (M.Sc. Philip Thomas)

Entangled photons are the fundamental resource for numerous quantum information protocols. However, most available sources of entangled photons suffer large inefficiencies due to inherently probabilistic processes. Here, we use a single Rubidium atom in an optical cavity as an emitter qubit to efficiently generate entangled graph states consisting of up to 14 photons. Our scheme demonstrates a clear scaling advantage over previous methods.

Real-space detection and manipulation of topological edge modes with ultracold atoms (M.Sc. Christoph Braun)

Periodic modulation is a powerful tool for the realization of topological phases in synthetic quantum systems. In our experiment with cold bosonic atoms, we realize a periodically driven honeycomb lattice in which depending on the driving parameters several out-of-equilibrium topological phases can be studied. I will present how chiral edge modes emerge at the boundary of a topologically non-trivial system as we introduce an edge into the lattice.