Master's project seminar: Luc Nieboer

The difficulties of including the gravitational interaction in the standard model, combined with its renormalisation problems, have led to doubts about whether gravity is a quantum entity following the laws of quantum mechanics. This has recently caused an increase in proposals for setups that use the properties of induced Entanglement between particles to test whether gravity has a quantum nature. In the non-relativistic limit, the Quantum Electrodynamics (QED) interactions calculations are very similar to gravity, making it a suitable model to study these setups. Using the Schwinger-Keldysh formalism, calculations were carried out on expectation values caused by the interaction. These show behaviour that, with additional calculations, could indicate entanglement, which violates the Local Operations and Classical Communication principle, implying that the interaction must be quantum. It is then argued that this derivation can be applied to the graviton, giving insight into the entanglement that the graviton could generate in a Quantum Gravity-induced Entanglement between Masses (QGEM) setup.