Discrete-time quadrature feedback cooling of a radio-frequency mechanical resonator
M. Poot, S. Etaki, H. Yamaguchi, and H. S. J. van der Zant
TL;DR
This paper demonstrates a feedback cooling method for a 2 MHz mechanical resonator using digital signal processing, achieving significant cooling and showing potential for GHz resonators.
Contribution
The authors introduce a digital feedback cooling scheme that combines high-frequency mixing with digital processing, enabling active cooling of mechanical resonators.
Findings
Achieved cooling to 14.3 mK temperature
Controlled frequency and damping rate via feedback
Applicable to GHz resonators
Abstract
We have employed a feedback cooling scheme, which combines high-frequency mixing with digital signal processing. The frequency and damping rate of a 2 MHz micromechanical resonator embedded in a dc SQUID are adjusted with the feedback, and active cooling to a temperature of 14.3 mK is demonstrated. This technique can be applied to GHz resonators and allows for flexible control strategies.
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