“…Current laboratory technology has enabled gradients of up to 24 T m −1 to be realized [45], so that our parameter choice is not unrealistic. Moreover, in the macroscopic ion traps the magnetic gradient is created by two anti-Helmholtz coils, which are placed far away from the trap, resulting in limited gradient [25,45]. However, in future planar traps, the gradient can be very high due to surface proximity.…”