Four-loop scattering amplitudes through the loop-tree duality

A general outlook is presented on the study of multiloop topologies appearing for the first time at four loops. A unified description and representation of this family is provided, the so-called N${}^4$MLT universal topology. Based on the Loop-Tree Duality framework, we discuss the dual opening of this family and expose the relevance of a causal representation. We explore an alternative procedure for the search of causal singular configurations of selected N${}^4$MLT Feynman diagrams through the application of a modified Grover’s quantum algorithm.