The understanding of fundamental questions like naturalness of the Higgs mass, the nature of Dark Matter and the mechanism behind the observed baryon asymmetry of the universe requires searches for New Physics at multiple frontiers. In this talk, I will discuss complementary probes of CP violation in the Higgs sector to test electroweak baryogenesis. In addition, I will present table-top atomic precision spectroscopy as a quantum sensing tool to probe new light bosons.