Subkelvin Parametric Feedback Cooling of a Laser-Trapped Nanoparticle
Subkelvin Parametric Feedback Cooling of a Laser-Trapped Nanoparticle
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DOI：
10.1103/physrevlett.109.103603
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发表时间：
2012-09-07
影响因子：
8.6
通讯作者：
Novotny, Lukas
中科院分区：
文献类型：
--
作者：
Gieseler, Jan;Deutsch, Bradley;Novotny, Lukas
我们在高真空中光学捕获单个纳米颗粒，并通过主动参量反馈冷却其三个空间自由度。使用一个单一的激光束捕获和冷却，我们证明了四个数量级的温度压缩比。不存在夹紧机构提供了与热浴的鲁棒解耦，并且消除了对低温预冷却的要求。纳米颗粒的小尺寸和质量产生高谐振频率和高品质因数沿着伴随低反冲加热，这是基态冷却和低退相干的必要条件。这里提出的捕获和冷却方案为用介观物体测试量子力学和超灵敏计量和传感开辟了新的途径。
We optically trap a single nanoparticle in high vacuum and cool its three spatial degrees of freedom by means of active parametric feedback. Using a single laser beam for both trapping and cooling we demonstrate a temperature compression ratio of four orders of magnitude. The absence of a clamping mechanism provides robust decoupling from the heat bath and eliminates the requirement of cryogenic precooling. The small size and mass of the nanoparticle yield high resonance frequencies and high quality factors along with low recoil heating, which are essential conditions for ground state cooling and for low decoherence. The trapping and cooling scheme presented here opens new routes for testing quantum mechanics with mesoscopic objects and for ultrasensitive metrology and sensing.