Fast feedback control of mechanical motion using circuit optomechanics

• URL: http://arxiv.org/abs/2211.15645v1
• Date: Mon, 28 Nov 2022 18:52:23 GMT
• Title: Fast feedback control of mechanical motion using circuit optomechanics
• Authors: Cheng Wang, Louise Banniard, Laure Mercier de L\'epinay, and Mika A. Sillanp\"a\"a
• Abstract summary: Measurement-based control, utilizing an active feedback loop, is a standard tool in technology. Here, we realize measurement-based feedback operations in an electromechanical system, cooling the mechanical thermal noise down to 3 quanta. We also obtain significant cooling when the system is pumped at the blue optomechanical sideband, where the system is unstable without feedback.
• Score: 7.692990114604929
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Measurement-based control, utilizing an active feedback loop, is a standard tool in technology. Feedback control is also emerging as a useful and fundamental tool in quantum technology and in related fundamental studies, where it can be used to prepare and stabilize pure quantum states in various quantum systems. Feedback-cooling of center-of-mass micromechanical oscillators, which typically exhibit a high thermal noise far above the quantum regime has been particularly actively studied and has recently been shown to allow for ground-state cooling using optical measurements. Here, we realize measurement-based feedback operations in an electromechanical system, cooling the mechanical thermal noise down to 3 quanta, limited by added amplifier noise. Counter-intuitively, we also obtain significant cooling when the system is pumped at the blue optomechanical sideband, where the system is unstable without feedback.

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