Laser俘获纳米粒子的亚开尔文参数反馈冷却
Sub-Kelvin Parametric Feedback Cooling of a Laser-Trapped Nanoparticle
摘要：
最近的实验已经证明了通过动态反作用将宏观力学振子光学冷却到其量子基态的能力。这样的实验使得量子力学可以用介观物体进行测试，并且代表了迈向量子光学存储器、换能器和放大器的重要一步。到目前为止考虑的大多数振荡器都与它们的热环境严格相连，从根本上限制了它们的机械Q因子，并需要低温预冷到液氦温度。在这里，我们展示了参数反馈冷却的激光捕获的纳米粒子，这是完全隔离的热浴。没有夹紧机构提供了与内部振动的鲁棒解耦，并且使得可以通过单个激光束在所有自由度上冷却纳米颗粒。与激光捕获微球相比，纳米粒子具有共振频率高、反冲热低的优点，这为量子基态冷却提供了有利条件
英文摘要：
Recent experiments have demonstrated the ability to optically cool a macroscopic mechanical oscillator to its quantum ground state by means of dynamic backaction. Such experiments allow quantum mechanics to be tested with mesoscopic objects, and represent an essential step toward quantum optical memories, transducers, and amplifiers. Most oscillators considered so far are rigidly connected to their thermal environment, fundamentally limiting their mechanical Q-factors and requiring cryogenic precooling to liquid helium temperatures. Here we demonstrate parametric feedback cooling of a laser-trapped nanoparticle which is entirely isolated from the thermal bath. The lack of a clamping mechanism provides robust decoupling from internal vibrations and makes it possible to cool the nanoparticle in all degrees of freedom by means of a single laser beam. Compared to laser-trapped microspheres, nanoparticles have the advantage of higher resonance frequencies and lower recoil heating, which are favorable conditions for quantum ground state cooling
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