Sympathetic cooling and squeezing of two colevitated nanoparticles
Sympathetic cooling and squeezing of two colevitated nanoparticles
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DOI：
10.1103/physrevresearch.5.013070
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发表时间：
2021-11
影响因子：
4.2
通讯作者：
T. Penny;A. Pontin;P. Barker
中科院分区：
文献类型：
--
作者：
T. Penny;A. Pontin;P. Barker
悬浮粒子是测量弱力和研究宏观物体量子力学的理想工具。这些粒子的两个或更多的阵列已被建议用于提高力灵敏度和纠缠宏观物体。在这篇文章中，两个带电的二氧化硅纳米粒子，通过它们的相互库仑排斥耦合，被困在保罗陷阱中，并且两个粒子的单个质量和电荷被表征。我们演示了一个纳米粒子通过库仑相互作用耦合到第二个纳米粒子的共感冷却，反馈冷却直接应用于第二个纳米粒子。我们还通过类似的过程实现了交感挤压，表明非热运动状态可以通过库仑相互作用转移。这项工作建立了冷却和操纵纳米颗粒阵列的协议，用于在未来的实验中传感和最小化光学加热的影响。
Levitated particles are an ideal tool for measuring weak forces and investigating quantum mechanics in macroscopic objects. Arrays of two or more of these particles have been suggested for improving force sensitivity and entangling macropscopic objects. In this article, two charged, silica nanoparticles, that are coupled through their mutual Coulomb repulsion, are trapped in a Paul trap, and the individual masses and charges of both particles are characterised. We demonstrate sympathetic cooling of one nanoparticle coupled via the Coulomb interaction to the second nanoparticle to which feedback cooling is directly applied. We also implement sympathetic squeezing through a similar process showing non-thermal motional states can be transferred by the Coulomb interaction. This work establishes protocols to cool and manipulate arrays of nanoparticles for sensing and minimising the effect of optical heating in future experiments.