Quantum-limited optical lever measurement of a torsion oscillator
arXiv:2409.11397 · doi:10.1364/OPTICA.549814
Abstract
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 SiN nanoribbons possessing torsion modes with torque sensitivities of and zero-point displacement spectral densities of . 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 phonons. Our study signals the potential for a new class of torsional quantum optomechanics.
arXiv comment9 pages, 6 figures
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