Lessons and complications from gravitationally induced entanglement

Abstract We critically review arguments depicting entanglement generated between exclusively gravitationally interacting particles as evidence for the necessity of a quantized gravitational field. For proposed experiments which are supposed to witness this induced entanglement, we discuss implications positive result and defend possibility semiclassical theory quantum matter on classical spacetime cannot be conclusively ruled out by witnessing entanglement. thought that resolve apparent causality issues with systems entangled via Newtonian interaction considering field, demonstrate quantization degrees freedom is not only unnecessary but may in remaining paradoxical behavior, unless previously disregarded decoherence channel taken into consideration.