Joint Seminar on Quantum Information and Technologies

Questions about the topological structure of our Universe are unanswered by the theory of relativity and are expected to be explained by a full theory of quantum gravity. In this talk, we will analyze how the topology of our Universe influences both vacuum fluctuations and vacuum entanglement. We will see in what ways and to what extent particle detectors are sensitive to the underlying topology of the Universe, and we will discuss how to use them to distinguish universes with identical local geometry that differ only in their topology. Furthermore, we will see that if the spacetime topology induces a preferred direction, vacuum entanglement harvesting becomes sensitive to it, thus pointing out a connection between spacetime topology, vacuum fluctuations, and the field vacuum entanglement structure.