  Qubit systems based on trapped ultracold ions win one of the leading
positions in the quantum computing field, demonstrating quantum algorithms with
the highest complexity to date. Surface Paul traps for ion confinement open the
opportunity to scale quantum processors to hundreds of qubits and enable
high-connectivity manipulations on ions. To fabricate such a system with
certain characteristics, the special design of a surface electrode structure is
required. The depth of the trapping potential, the stability parameter, the
secular frequency and the distance between an ion and the trap surface should
be optimized for better performance. Here we present the optimized design of a
relatively simple surface trap that allows several important high-fidelity
primitives: tight ion confinement, laser cooling, and wide optical access. The
suggested trap design also allows to perform an important basic operation,
namely, splitting an ion chain into two parts.
