Suppressing Differential Light Shifts in ¹⁷¹Yb⁺ g- and m-type Qubits

The omg architecture alleviates the need for co-species trapping by establishing isolated state manifolds within a trapped ion for flexible qubit encoding of state preparation, read out, and cooling. Laser-based quantum gates, however, have limited isolation from spectator manifolds, and light-shift induced dephasing of states not involved with the gate operation can lead to decoherence. Magnetic-field-induced vector light shifts are polarization-dependent, and may be used to eliminate the differential light shift. We perform an experiment to demonstrate that a choice of polarization ellipticity at a given static magnetic field will suppress the differential light shift and increase coherence time of spectator qubits. We demonstrate this effect in ¹⁷¹Yb⁺ for the ²S_1/2 ground clock qubit and present progress on the effect in ²F_7/2 metastable clock qubit.