In a collaboration led by the group of Otfried Gühne at the University of Siegen, we performed an experimental study with the aim of certifying the topology — that is, the entanglement structure — of different six-partite quantum networks.
SU(1,1) or nonlinear interferometers that is, Mach-Zehnder-like interferometers that replace the beam splitters with quantum light sources, have become increasingly relevant for applications.
We have demonstrated that a single nonlinear optical waveguide and a spectral pulse shaper can be used to realize frequency-encoded networks with up to 64 inputs and outputs