Optical Trapping of Ion Coulomb Crystals
Optical Trapping of Ion Coulomb Crystals
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DOI：
10.1103/physrevx.8.021028
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发表时间：
2017-12
期刊：
影响因子：
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通讯作者：
Julian Schmidt;A. Lambrecht;P. Weckesser;M. Debatin;Leon Karpa;T. Schaetz
中科院分区：
文献类型：
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作者：
Julian Schmidt;A. Lambrecht;P. Weckesser;M. Debatin;Leon Karpa;T. Schaetz
囚禁离子的电子和运动自由度可以在单个量子的水平上被控制和相干耦合。在保持这种独特的控制水平的同时，逐个离子组装复杂的量子系统仍然是一项具有挑战性的任务。对于许多应用，传统阱中的线性离子链非常适合解决这个问题。然而，由于磁或射频电捕获场的驱动运动有时限制了一维的性能，并严重影响了向高维系统的扩展。在这里，我们报告了在没有射频或附加磁场的情况下，在单光束光偶极阱中捕获多个钡离子。我们研究了光阱中多达六个离子的合奏中的秩序的持久性，测量它们的温度，并得出结论，离子形成线性链，通常称为一维库仑晶体。作为概念验证的演示，我们访问的集体运动，并执行光谱法的正常模式的光阱。我们的系统提供了一个平台，这是免费的驱动运动，并结合了光学捕获的优势，如状态相关的限制和纳米级的潜力，与理想的性能的晶体被困离子，如远程相互作用的集体运动。从少量的离子开始，有人提出，这些性质将允许多体物理学的实验研究和一维和二维晶体之间的结构量子相变的开始。
The electronic and motional degrees of freedom of trapped ions can be controlled and coherently coupled on the level of individual quanta. Assembling complex quantum systems ion by ion while keeping this unique level of control remains a challenging task. For many applications, linear chains of ions in conventional traps are ideally suited to address this problem. However, driven motion due to the magnetic or radio-frequency electric trapping fields sometimes limits the performance in one dimension and severely affects the extension to higher dimensional systems. Here, we report on the trapping of multiple Barium ions in a single-beam optical dipole trap without radio-frequency or additional magnetic fields. We study the persistence of order in ensembles of up to six ions within the optical trap, measure their temperature and conclude that the ions form a linear chain, commonly called a one-dimensional Coulomb crystal. As a proof-of-concept demonstration, we access the collective motion and perform spectrometry of the normal modes in the optical trap. Our system provides a platform which is free of driven motion and combines advantages of optical trapping, such as state-dependent confinement and nano-scale potentials, with the desirable properties of crystals of trapped ions, such as long-range interactions featuring collective motion. Starting with small numbers of ions, it has been proposed that these properties would allow the experimental study of many-body physics and the onset of structural quantum phase transitions between one- and two-dimensional crystals.