  Quantum information processing based on magnetic ions are considered
potential candidates for applications because they can be modified and scaled
up by a variety of chemical methods. For these systems to achieve individual
spin addressability and high energy efficiency, we exploited the electric field
as a tool to manipulate their quantum behaviours, functioning via spin-orbit
coupling. A Ce:YAG single crystal was employed due to that rare-earth ions have
strong spin-orbit coupling and with considerations regarding the dynamics and
the symmetry requirements. The Stark effect of the Ce3+ ion was observed and
measured. When demonstrated as a quantum phase gate, the electric field
manipulation exhibited high efficiency which allowed up to 57 {\pi}/2
operations before decoherence with optimized field directions. It was also
utilized to carry out quantum bang-bang control, as a method of dynamic
decoupling, and the refined Deutsch-Jozsa algorithm. Our experiments
highlighted rare-earth ions as potentially applicable qubits since they offer
enhanced spin-electric coupling which enables high-efficiency quantum
manipulation.
