Quantum control of levitated dielectric particles is an emerging subject in quantum optomechanics. A major challenge is to efficiently measure and manipulate the particle’s motion at the Heisenberg uncertainty limit. Here we present a nanophotonic interface suited to address this problem. By optically trapping a 150 nm silica particle and placing it in the near field of a photonic crystal cavity, we achieve tunable single-photon optomechanical coupling of up to $g_0/2\pi =9\mathrm{kHz}$, three orders of magnitude larger than previously reported for levitated cavity optomechanical systems. Efficient collection and guiding of light through the nanophotonic structure results in a per-photon displacement sensitivity that is increased by two orders of magnitude compared to conventional far-field detection. The demonstrated performance shows a promising route for room temperature quantum optomechanics.

中文翻译：

---

悬浮的纳米粒子与光子晶体腔的近场耦合

悬浮介电粒子的量子控制是量子光力学中的新兴课题。一个主要的挑战是在Heisenberg不确定性极限下有效地测量和操纵粒子的运动。在这里，我们提出了适合解决这个问题的纳米光子界面。通过光学捕获150 nm的二氧化硅颗粒并将其放置在光子晶体腔的近场中，我们实现了高达$G_0/\mathrm{2个}\pi =9\mathrm{千赫}$，比以前报道的悬浮腔光学机械系统大三个数量级。与常规远场检测相比，通过纳米光子结构有效收集和引导光会导致每光子位移灵敏度增加两个数量级。证明的性能显示了室温量子光力学的有前途的途径。