Cavity Cooling a Single Charged Levitated Nanosphere
Cavity Cooling a Single Charged Levitated Nanosphere
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DOI：
10.1103/physrevlett.114.123602
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发表时间：
2015-03-27
影响因子：
8.6
通讯作者：
Barker, P. F.
中科院分区：
文献类型：
--
作者：
Millen, J.;Fonseca, P. Z. G.;Barker, P. F.
悬浮物体的光机腔冷却为对与环境大体上解耦的系统的宏观量子行为进行实验室研究提供了可能性。然而，粒子损失机制阻碍了实验进展，这种机制使得在真空中无法实现悬浮和腔冷却。我们用一种由单模光学腔中的保罗阱形成的新型混合电光阱解决了这个问题。我们展示了对在真空中捕获的直径为400纳米的二氧化硅球进行100倍的腔冷却。这为在更小、更高精细度的腔中实现基态冷却铺平了道路，因为我们表明混合阱的一个新特性是，即使对于单电荷纳米球，光机冷却也会由保罗阱主动驱动。
Optomechanical cavity cooling of levitated objects offers the possibility for laboratory investigation of the macroscopic quantum behavior of systems that are largely decoupled from their environment. However, experimental progress has been hindered by particle loss mechanisms, which have prevented levitation and cavity cooling in a vacuum. We overcome this problem with a new type of hybrid electro-optical trap formed from a Paul trap within a single-mode optical cavity. We demonstrate a factor of 100 cavity cooling of 400 nm diameter silica spheres trapped in vacuum. This paves the way for ground-state cooling in a smaller, higher finesse cavity, as we show that a novel feature of the hybrid trap is that the optomechanical cooling becomes actively driven by the Paul trap, even for singly charged nanospheres.