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arXiv 2102.01060quant-phphysics.app-ph
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悬浮振子反馈冷却方法的性能和限制:直接比较

Performance and limits of feedback cooling methods for levitated oscillators: a direct comparison

T. W. Penny, A. Pontin, P. F. Barker

摘要:

冷却质心运动是悬浮光学机械系统的重要工具,但通常不清楚哪种方法可以实际达到特定实验的较低温度。我们直接比较了参数和速度反馈阻尼方法,这是广泛用于冷却的运动中的一系列陷阱的单个被困粒子。通过对相同的粒子进行实验,并使用相同的检测系统,我们证明了速度阻尼将振荡器冷却到较低的温度,并且对不完美的实验条件更具弹性。我们表明,这些结果是一致的分析限制,以及包括实验噪声的数值模拟。

英文摘要:

Cooling the centre-of-mass motion is an important tool for levitated optomechanical systems, but it is often not clear which method can practically reach lower temperatures for a particular experiment. We directly compare the parametric and velocity feedback damping methods, which are used extensively for cooling the motion of single trapped particles in a range of traps. By performing experiments on the same particle, and with the same detection system, we demonstrate that velocity damping cools the oscillator to lower temperatures and is more resilient to imperfect experimental conditions. We show that these results are consistent with analytical limits as well as numerical simulations that include experimental noise.

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