Fundamental questions in astrophysics and cosmology such as the matter to antimatter asymmetry (baryon asymmetry) in the universe or the existence of dark matter are thought to be closely linked to particle physics. For example, the baryon asymmetry of the universe can be explained by models of leptogenesis, which require special properties of neutrinos. And the as yet unknown dark matter presumably consists of particles that require physics beyond the standard model of particle physics. This question can be investigated using search and precision experiments in (astro)particle physics at low energies. In this colloquium, this will be illustrated by three examples: the search for neutrinoless double beta decay, the direct search for the neutrino mass and the direct search for dark matter. These searches will be explained using specific experiments, such as the KATRIN and XENONnT experiments including their recent results, as well as the respective perspectives for the future possibilities

The cross section for an infrared safe observable in hadron-hadron collisions can be written as the convolution of parton distribution functions (PDFs) for the two hadrons and a perturbatively calculable hard scattering function, with power suppressed corrections. The arguments that this PDF factorization works at all orders of perturbation theory involves the cancellation of what are called Glauber singularities from soft gluons that interact with both hadrons. I illustrate the arguments used in a 1988 paper with Collins and Sterman by applying these arguments to graphs at the lowest order in which the Glauber problems appear. We can see in this simple example how the contributions from Glauber singularities disappear. This sort of analysis is perhaps useful for the analysis of "non-global" logarithms in certain observables.

Integrated Quantum Optics, Department Physics, Institute for Photonic Quantum Systems (PhoQS,), Paderborn University, 33098 Paderborn, Germany Quantum technologies promise a change of paradigm for many fields of application, for example in communication systems, in high-performance computing and simulation of quantum systems, as well as in sensor technology. Current efforts in photonic quantum science target the implementation of practical devices and scalable systems, where the realization of quantum devices for real-word deployment and controlled quantum network structures is key for many applications. Here we present our work on three different fields in this area: non-linear integrated quantum optics, pulsed temporal modes and photonic quantum computation.