论文标题
光学晶格附近中性纳米颗粒的光冷阻尼
Optical cold damping of neutral nanoparticles near the ground state in an optical lattice
论文作者
论文摘要
我们提出并展示了光学晶格中中性纳米颗粒的纯粹反馈冷却，以$ 0.85 \ pm0.20 $的职业数量。冷却力源自捕获激光器上有两个边带产生的位移光学晶格的光学梯度。为了实现在接地状态附近冷却所需的高度准确的位置观测值，我们将激光强度噪声降低到$ \ unit [30] {kHz} $ to $ \ unit的频段中的$ \ ution的相对功率噪声[6 \ times10^{ - 8}] {/hz} $。我们建立了一种可再现的方法，可以通过放电和照射紫外线的结合在高真空中中和纳米颗粒。我们的结果构成了研究超电纳米颗粒的量子机械性能的重要基础，并且对于中性纳米颗粒的精确测量也很有用。
We propose and demonstrate purely optical feedback cooling of neutral nanoparticles in an optical lattice to an occupation number of $0.85\pm0.20$. The cooling force is derived from the optical gradients of displaced optical lattices produced with two sidebands on the trapping laser. To achieve highly accurate position observations required for cooling near the ground state, we reduce the laser intensity noise to a relative power noise of $\unit[6\times10^{-8}]{/Hz}$ in a frequency band of $\unit[30]{kHz}$ to $\unit[600]{kHz}$. We establish a reproducible method for neutralizing nanoparticles at high vacuum via a combination of discharging and irradiating an ultraviolet light. Our results form an important basis for the investigation of quantum mechanical properties of ultracold nanoparticles and are also useful for precision measurements with neutral nanoparticles.
