发表机构
University College London; David Potter Institute for Quantum Information and Spacetime, University College London; Department of Physics and Astronomy, University College London（伦敦大学学院; 伦敦大学学院戴维·波特量子信息与时空研究所; 伦敦大学学院物理与天文学系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文演示了径向矢量光束陷阱中二氧化硅纳米粒子的光学悬浮与反馈冷却，实现了毫开尔文温度，为利用结构光抑制悬浮量子光力学中的加热效应奠定了基础。
AI 中文摘要
我们展示了在高真空中，使用径向矢量光束（RVB）捕获的二氧化硅纳米粒子（半径 = 78 nm）的光学悬浮和反馈冷却。径向矢量光束经高数值孔径透镜聚焦后，产生的焦斑比传统高斯光束更小，从而形成更紧致的光学势阱，并可能降低光子反冲加热速率。实验中，使用涡旋波片生成径向矢量光束，并采用非球面透镜（NA = 0.77）形成陷阱。通过冷阻尼反馈，将径向和轴向陷阱方向上的质心运动冷却至毫开尔文（mK）量级的温度。在较高温度和压力下，观察到由非线性径向矢量光束光学势阱引起的额外陷阱频率。这一演示是朝着利用结构光进行悬浮量子光力学迈出的一步，在这些陷阱中，结构光可用于抑制体加热和运动加热。
英文摘要
We demonstrate optical levitation and feedback cooling of a silica nanoparticle (radius = 78~nm) trapped within a radial vector beam (RVB) in high vacuum. Radial vector beams, when focused by a high-NA lens, produce a smaller focal spot than conventional Gaussian beams, yielding tighter optical potentials and potentially reduced photon-recoil heating rates. A vortex wave plate was used to generate the RVB using an aspheric lens (NA = 0.77) to form the trap. Cold-damping feedback was used to cool the center of mass motion in the radial and axial trap directions to temperatures in the mK range. At higher temperatures and pressures, additional trap frequencies arising from the nonlinear RVB optical potential are observed. This demonstration is a step toward exploiting structured light for levitated quantum optomechanics where these traps can be used to suppress bulk and motional heating.
Comments7 pages, 7 figures
