论文标题
创建原子纳米粒子量子叠加
Creating atom-nanoparticle quantum superpositions
论文作者
论文摘要
在其质量中心的非经典状态下证明的纳米级对象将大大扩展量子力学的边界。为了获得相同的实用方案，我们利用迄今未开发的耦合系统：一个原子和由光场耦合的纳米颗粒。我们展示了如何使用原子的内部状态来控制大型$ \ sim500 $ nm纳米颗粒的质量中心，以创建纳米颗粒的非经典运动状态。具体而言，我们考虑基于与剖宫产的二氧化硅纳米颗粒的设置，并讨论了准备和验证纳米颗粒的schrödinger-cat状态的方案，该纳米颗粒状态无需冷却到运动基态。我们表明，使用地球的重力场可以使用对最常见的逆转源不敏感的方法来揭示叠加的存在，并适用于纳米颗粒的任何初始状态。
A nanoscale object evidenced in a non-classical state of its centre of mass will hugely extend the boundaries of quantum mechanics. To obtain a practical scheme for the same, we exploit a hitherto unexplored coupled system: an atom and a nanoparticle coupled by an optical field. We show how to control the center-of-mass of a large $\sim500$nm nanoparticle using the internal state of the atom so as to create, as well as detect, nonclassical motional states of the nanoparticle. Specifically, we consider a setup based on a silica nanoparticle coupled to a Cesium atom and discuss a protocol for preparing and verifying a Schrödinger-cat state of the nanoparticle that does no require cooling to the motional ground state. We show that the existence of the superposition can be revealed using the Earth's gravitational field using a method that is insensitive to the most common sources of decoherence and works for any initial state of the nanoparticle.
