一毫克扭摆仪向量子引力界面实验迈进
One-milligram torsional pendulum toward experiments at the quantum-gravity interface
AI总结：
本研究提出了一种1毫克扭摆仪，通过激光冷却实现了240微开尔文的低温，显著提升了量子引力界面实验的精度和性能。
摘要：
探测通过引力生成纠缠的可能性为解决引力场是否具有量子力学性质的问题提供了途径。潜在的实现需要具有低频动力学并在最佳质量尺度上的系统，其中微克到毫克范围是一个强有力的候选者。在此，我们改进了该问题的优劣指标，提出了一个以18赫兹运行的1毫克扭摆仪。我们展示了通过激光冷却将其运动从室温降至240微开尔文，超过了从微克到千克范围的振荡器所达到的最冷运动的20倍以上。我们量化并对比了当前方法与其他平台的实用性。所取得的性能和巨大的改进潜力突显出毫克级扭摆仪作为精密测量的强大平台，对于未来在量子引力界面的研究具有重要意义。
英文摘要：
Probing the possibility of entanglement generation through gravity offers a path to tackle the question of whether gravitational fields possess a quantum mechanical nature. A potential realization necessitates systems with low-frequency dynamics at an optimal mass scale, for which the microgram-to-milligram range is a strong contender. Here, after refining a figure-of-merit for the problem, we present a 1-milligram torsional pendulum operating at 18 Hz. We demonstrate laser cooling its motion from room temperature to 240~microkelvins, surpassing by over 20-fold the coldest motions attained for oscillators ranging from micrograms to kilograms. We quantify and contrast the utility of the current approach with other platforms. The achieved performance and large improvement potential highlight milligram-scale torsional pendulums as a powerful platform for precision measurements relevant to future studies at the quantum-gravity interface.
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