2023/04/13 by J. P. van Soest, C. A. Potts, van Soest, J. P. +7
Engineering · Physics and Astronomy · #Advanced MEMS and NEMS Technologies #Experimental and Theoretical Physics Studies #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Mechanical and Optical Resonators #Quantum Physics (quant-ph)
paper · pdf · doi:10.48550/arxiv.2304.06296
openalex publication_date 2023/04/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
Environmental noise coupling to mechanical experiments often introduces low-frequency fluctuations to the resonators, adding noise to measurements and reducing signal to noise. To counter these fluctuations, we demonstrate a dynamic feedback system implemented by the locking of a microwave drive to the noisy cavity. A homodyne interferometer scheme monitors the cavity resonance fluctuations due to low-frequency noise, which is mitigated by frequency-modulating (FM) the microwave generator. The feedback has a bandwidth of 400 Hz, with a reduction of cavity fluctuations by 84% integrating up to a bandwidth of 2 kHz. Moreover, the cavity resonance frequency fluctuations are reduced by 73%. This scheme can be scaled to enable multi-tone experiments locked to the same feedback signal. As a demonstration, we apply the feedback to an optomechanical experiment and implement a cavity-locked, multi-tone mechanical measurement. As low-frequency cavity frequency noise can be a limiting factor in many experiments, the multi-tone microwave locking technique presented here is expected to be relevant for a wide range of fields of research.