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Chinese Physics Letters

Control of a Cloud of Laser-Cooled ^40Ca^＋ in a Linear Ion Trap

周飞, 谢艺, 徐酉阳, 李交美, 黄学人, 冯芒

Published Jan 1, 2010• 0 citations
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Abstract

一群凉下来激光的 40Ca+ 成功地被套住并且在我们的造家的线性离子陷井在井控制下面操作了，它被设计并且构造了完全学习量信息处理。由关于陷井参数探索离子云的变化，我们优化了套住的条件并且获得了很好的荧光系列。我们观察离子云的动力学，并且估计离子云的温度具有毫的顺序 -- 凯尔文。

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Chinese Physics Letters•Apr 1, 2010•7 citations
一群凉下来激光的 40Ca+ 成功地被套住并且在我们的造家的线性离子陷井在井控制下面操作了，它被设计并且构造了完全学习量信息处理。由关于陷井参数探索离子云的变化，我们优化了套住的条件并且获得了很好的荧光系列。我们观察离子云的动力学，并且估计离子云的温度具有毫的顺序 -- 凯尔文。
44Ca+, Zn+, or Ga+ ions are sympathetically cooled by Coulomb interaction with laser-cooled 40Ca+ ions, and motional resonances of these ions are observed by monitoring the fluorescence of the 40Ca+ ions. In the experiment of sympathetic cooling of 44Ca+, the ratio of the decrease in the fluorescence signal at the motional resonance of the sympathetically cooled species to that at the motional resonance of the laser-cooled species is almost proportional to the number ratio of the two species. In the case of Ga+ ions as the sympathetically cooled species, the change in the response of sympathetically cooled species becomes larger as the temperature of the ion cloud decreases. Crystallization of an ion cloud which contains both 40Ca+ and Zn+ (or Ga+) is observed.
A cloud of laser-cooled 40 Ca + is successfully trapped and manipulated under well control in our home-built linear ion trap, which is designed and constructed solely for studying quantum information processing. By exploring the variation of the ion cloud with respect to the trap parameters, we have optimized the trapping condition and obtained very good fluorescence spectra. We observe the dynamics of the ion cloud, and estimate the temperature of the ion cloud to be of the order of milli-Kelvin.