论文标题
腔静脉纳米球的二次光学冷却
Quadratic optomechanical cooling of a cavity-levitated nanosphere
论文作者
论文摘要
我们报告说，由于其运动和高技巧腔的光场之间的纯二次耦合，纳米颗粒的质量运动。产生的相互作用引起了范德波尔非线性阻尼，该阻尼类似于传统的参数反馈，其中空腔提供了无被子反馈而无需测量。我们从实验上表明，就像反馈冷却所得的能量分布是强烈的非热分布，并且可以通过腔体的非线性阻尼来控制。由于二次耦合在拟议的协议中产生深度非古典状态的拟议协议中起着重要作用，因此我们的工作代表了在悬浮系统中产生此类状态的第一步。
We report on cooling the center-of-mass motion of a nanoparticle due to a purely quadratic coupling between its motion and the optical field of a high finesse cavity. The resulting interaction gives rise to a Van der Pol nonlinear damping, which is analogous to conventional parametric feedback where the cavity provides passive feedback without measurement. We show experimentally that like feedback cooling the resulting energy distribution is strongly nonthermal and can be controlled by the nonlinear damping of the cavity. As quadratic coupling has a prominent role in proposed protocols to generate deeply nonclassical states, our work represents a first step for producing such states in a levitated system.
