Fundamental Symmetry Tests via Precision Hydrogen-Antihydrogen Comparisons: ALPHA at CERN and HAICU at TRIUMF

Precision comparisons between hydrogen and antihydrogen atoms present significant opportunities to test fundamental symmetries and principles in nature, such as CPT invariance and the Weak Equivalence Principle. Over the past two decades, experiments at CERN's Antiproton Decelerator facility have made notable progress. Particularly, the ALPHA (Antihydrogen Laser PHysics Apparatus) experiment has developed techniques for confining antihydrogen atoms and studying their spectroscopic properties in a magnetic "bottle". In recent years, our team has been working on a new project called ALPHA-g, which aims to investigate the gravitational behavior of antimatter by “dropping” antihydrogen atoms. Additionally, we have initiated an ambitious project at TRIUMF, named HAICU (Hydrogen-Antihydrogen Infrastructure at Canadian Universities), with the objective of employing precision quantum sensing techniques, including atomic fountains and atom interferometers, to study antimatter atoms. In this talk, we will provide an overview of the current status of the ALPHA project at CERN and discuss the future opportunities associated with HAICU, which is currently under development at TRIUMF.