Fundamental symmetries via quantum sensing with polyatomic molecules

Atoms and molecules are sensitive proves of the nucleus, including collective nuclear CP-violating effects such as magnetic quadrupole moments and nuclear Schiff moments. Molecules provide high intrinsic sensitivity due to their ability to be efficiently polarized in the laboratory frame, but their complex structure presents many experimental challenges. In this talk we discuss using engineered polyatomic molecules which combine high polarizability, optical control for advanced quantum sensing, and high intrinsic sensitivity to symmetry violations. We provide an update for two ongoing experiments at Caltech: a nuclear magnetic quadrupole moment search in 173YbOH, and the production, cooling, and spectroscopy of 226RaOH using methods which would be applicable to other radioactive species.