Quantum logic control and precision measurements of molecular ions in a ring trap -- a new approach for testing fundamental symmetries

This letter describes an experimental platform that implements quantum logic control of polar molecular ions in a ring surface ion trap for precision measurements. This approach targets unity state preparation and detection and long spin precession coherence. A unique feature is bridging the spin-polarization in a static frame and the spin-precession in a rotating frame. The new method accommodates temporally and spatially localized multiplexing measurements and can be ubiquitously applied to generic ion species. This platform may be applied to the electron's Electric Dipole Moment search using $^{232}$ThF$^+$ and could be extended to the Nuclear Magnetic Quadrupole Momentum search using $^{181}$TaO$^+$.