Design of a novel monolithic parabolic-mirror ion-trap to precisely align the RF null point with the optical focus

We propose a novel ion trap design with the high collection efficiency parabolic-mirror integrated with the ion trap electrodes. This design has three radio frequency (RF) electrodes and eight direct current(DC) compensation electrodes. By carefully adjusting three RF voltages, the parabolic mirror focus can be made precisely coincident with the RF null point. Thus, the aberration and the ion micromotion can be minimized at the same time. This monolithic design can significantly improve the ion-ion entanglement generation speed by extending the photon collecting solid angle beyond $90\%\cdot4\pi$. Further analysis of the trapping setup shows that the RF voltage variation method relexes machining accuracy to a broad range. This design is expected to be a robust scheme for trapping ion to speed entanglement network node.