Figure 1
From: Hybrid setup for stable magnetic fields enabling robust quantum control
Experimental setup and spatial properties of the solid-state magnet assembly. (a) Cross-sectional view of an ultra-high vacuum chamber housing a surface-electrode trap (indicated at the centre), used for spatial manipulation of single atoms. Two sets of rare-earth, ring magnets generate a magnetic (quantisation) field B0 along their symmetry axis \(\hat{z}\) (indicated by 
). In addition, three individual pairs of magnetic field (shim) coils are mounted on corresponding mechanical support structure, marked with (
). The shim coils enable fine tuning of B0 along longitudinal and orthogonal (vertical and horizontal) directions. Preparation and detection laser beams (
) enter the chamber along B0. A home-built biquad antenna (sketched in the top left corner) is used to apply microwaves around 2π × 1,600 MHz for internal state manipulation of the atom. (b) The magnetic-field variation of the solid-state magnets close to their geometrical centre (inset shows larger region) along \(\hat{z}\), calculated using Eq. 1. From numerical calculations, considering all directions, we infer a diameter of spherical volume \({d}_{{\rm{dsv}}}\simeq 150\) μm, where ΔB0/B0 ≤ 1 × 10−6.
