A Monolithic Three-Dimensional Linear Ion Trap*

Trapped ions are a successful platform for quantum information processing, metrology, and many other applications. Compared to microfabricated surface traps, three-dimensional (3D) blade traps benefit from lower heating rate, deeper and more symmetric trapping potential, higher optical access, and better shielding from stray electric fields. However, they are generally assembled from discrete blades and are susceptible to misalignment, which can lead to excess micromotion as well as an inhomogeneous and non-harmonic trapping potential. We present the design and construction of a monolithic 3D blade trap fabricated from a single piece of fused silica, using photochemical processes developed by our collaborator  Translume Inc. We discuss the optimization of the trapping potential for a long ion-chain with even spacing. We also present the design of the ceramic structures for mounting the trap, which allows for easy assembly and efficient heat dissipation, while maintaining high optical access.