扭转振荡器的量子限光学杠杆测量

Christian M. Pluchar, Aman R. Agrawal, Dalziel J. Wilson
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引用次数: 0

摘要

光学杠杆是一种应用广泛的精密位移传感器。原则上,它可以在标准量子极限(SQL)的附加噪声下跟踪机械振荡器的运动;然而,要展示这种性能,需要振荡器具有极高的扭矩灵敏度,或者等效于零点角位移谱密度。在这里,我们描述了对 Si$_3$N$_4$ 纳米带的光学杠杆测量,这些纳米带具有 $Q>3 次 10^7$ 扭转模式,扭矩灵敏度为 10^{-20}\,\text{N m}/\sqrt\{text{Hz}}$ ,零点位移谱密度为 10^{-10}\,\text{rad}/\sqrt\{text{Hz}}$ 。通过补偿像差和利用对经典强度噪声的抗扰性,我们实现了角位移测量,其精度低于SQL 20 dB,并利用位置调制激光束作为扭矩致动器,演示了从室温到$\sim5000$声子的反馈冷却。我们的研究预示着一种新型扭转量子光学力学的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantum-limited optical lever measurement of a torsion oscillator
The optical lever is a precision displacement sensor with broad applications. In principle, it can track the motion of a mechanical oscillator with added noise at the Standard Quantum Limit (SQL); however, demonstrating this performance requires an oscillator with an exceptionally high torque sensitivity, or, equivalently, zero-point angular displacement spectral density. Here, we describe optical lever measurements on Si$_3$N$_4$ nanoribbons possessing $Q>3\times 10^7$ torsion modes with torque sensitivities of $10^{-20}\,\text{N m}/\sqrt{\text{Hz}}$ and zero-point displacement spectral densities of $10^{-10}\,\text{rad}/\sqrt{\text{Hz}}$. Compensating aberrations and leveraging immunity to classical intensity noise, we realize angular displacement measurements with imprecisions 20 dB below the SQL and demonstrate feedback cooling, using a position modulated laser beam as a torque actuator, from room temperature to $\sim5000$ phonons. Our study signals the potential for a new class of torsional quantum optomechanics.
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