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Chinese Physics Letters

A Single Laser Cooled Trapped 40 Ca + Ion in a Miniature Paul Trap

Shu Hua-Lin, Guan Hua, Huang Xue-Ren, Jiaomei Li, Kelin Gao

Published Jun 16, 2005• 16 citations
Publisher

Abstract

We have observed the phenomenon of phase transition of a few trapped ions in a miniature Paul trap. Judging from the quantum jump signals, a single laser-cooled trapped Ca + ion has been realized. The ion temperature is estimated to be 22 mK. The result shows that the amplitude of ion micromotion is strongly dependent on the rf voltage.
DOI
10.1088/0256-307x/22/7/023

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We have fabricated a miniature three-segment linear Paul trap with r 0=0.6 mm and 2Z 0=4 mm. In order to perform quantum-state manipulation of trapped 40 Ca+ ions, we discuss the required harmonic oscillation frequencies which allow us to perform effective sideband cooling and have measured those that depend on the dimensions of the trap. A laser beam that has a component in the radial direction of the linear trap as well as that propagating along the trap axis has been used to detect the fluorescence spectra of the 42 S 1/2–42 P 1/2 transition. We have observed that the profile of the fluorescence spectrum obtained with the side laser beam is markedly different from that obtained with the axial laser beam due to micromotion. By applying additional DC voltages, the micromotion has been compensated, its amplitude has been estimated, and crystallization has been observed for two 40 Ca+ and four 40 Ca+ ions.