Multi-Tone Microwave Locking via Real-Time Feedback
- URL: http://arxiv.org/abs/2304.06296v2
- Date: Wed, 12 Jul 2023 09:00:20 GMT
- Title: Multi-Tone Microwave Locking via Real-Time Feedback
- Authors: J.P. van Soest, C.A. Potts, S. Peiter, A. Sanz Mora, G.A. Steele
- Abstract summary: Low-frequency noise coupling to mechanical experiments often introduces low-frequency fluctuations to the resonators.
We demonstrate a dynamic feedback system implemented by the locking of a microwave drive to the noisy cavity.
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.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: 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.
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