Ion traps with enhanced optical and physical access

Details Ion traps with enhanced optical and physical access Ion traps with enhanced optical and physical access

2008-10-15

arxiv.org/abs/0810.2647v2

Nature Physics 5, 551 - 554 (2009)

Physics

Quantum Physics

6 pages, 3 figures. Corrections of some typos, application section expanded to account for reviewer comments

Scientific paper

10.1038/nphys1311

Small, controllable, highly accessible quantum systems can serve as probes at the single quantum level to study multiple physical effects, for example in quantum optics or for electric and magnetic field sensing. The applicability of trapped atomic ions as probes is highly dependent on the measurement situation at hand and thus calls for specialized traps. Previous approaches for ion traps with enhanced optical access included traps consisting of a single ring electrode or two opposing endcap electrodes. Other possibilities are planar trap geometries, which have been investigated for Penning traps and rf-trap arrays. By not having the electrodes lie in a common plane the optical access in the latter cases can be substantially increased. Here, we discuss the fabrication and experimental characterization of a novel radio-frequency (rf) ion trap geometry. It has a relatively simple structure and provides largely unrestricted optical and physical access to the ion, of up to 96% of the total 4pi solid angle in one of the three traps tested. We also discuss potential applications in quantum optics and field sensing. As a force sensor, we estimate sensitivity to forces smaller than 1 yN Hz^(-1/2).

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