Progress toward the measurement of CP violating electromagnetic moments in YbOH

Precision measurements of molecules with heavy elements have established themselves as an effective tool in the search for physics beyond the Standard Model, thanks to their high sensitivity to charge parity (CP) violating electromagnetic moments. The polyatomic molecule YbOH presents a favorable opportunity for exploring such physics in both the leptonic and hadronic sectors, through the measurement of the electron's electric dipole moment (eEDM) in the 174YbOH isotopologue and the nuclear magnetic quadrupole moment (nMQM) in the 173YbOH isotopologue. The presence of a localized electron around the Yb nucleus facilitates photon cycling, and its mechanical bending mode generates parity doublets in the electronic ground state, allowing for full polarization and robust systematic error rejection. We provide an update on recent theoretical and experimental efforts aimed at achieving these goals, including the high-resolution spectroscopy of states pertinent to CP-violation searches, investigation of novel state preparation schemes, observation of coherent state preparation and readout, and progress toward measurement of the nMQM.