Detection of parametric resonance of trapped ions for micromotion compensation

Micromotion compensation in a surface electrode trap by parametric excitation of trapped ions

“…The parametric resonances are observed only if the modulation index h exceeds a certain critical value that depends , the resonance signal disappears, which implies that micromotion is reduced by adjusting the center voltage on additional damping term in (2), which models the effect of laser cooling [13]. On the contrary, when h is too large, the fluorescence level does not return to the original level after the resonance.…”

“…Here we demonstrate micromotion compensation of a single ion, however, this technique can also be applied to two ions as described in Ref. [13]. The compensation sequence can be determined by considering the role of each electrode.…”

“…These signals were obtained by using 850-nm laser light to excite the 3d 2 D 3/2 -4p 2 P 3/2 transition, which transfers the population from the 3d 2 D 3/2 state to the 3d 2 D 5/2 state via the 4p 2 P 3/2 state are described in Ref. [13]. Here, we give an overview of this technique.…”

“…In Ref. [13], a parametric resonance signal was observed for n = 1 and 2 in the conventional linear trap and compensation was performed using the resonance of n = 2. However, it was difficult to observe the resonance of n = 2 in the surface electrode trap.…”

“…Ca + ions are used to evaluate the trap performance. We demonstrate that a method utilizing parametric resonance induced by a modulated rf potential [13] can be applied to a surface electrode trap. After compensating the micromotion components parallel to the trap surface by the conventional method, we detect the parametric resonance signal from a single ion at twice the secular frequency in the normal direction and minimize the signal by adjusting an applied voltage.…”