Discrete-time quadrature feedback cooling of a radio-frequency mechanical resonator

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.

To appear in Appl. Phys. Lett

References in corpus (4)

• Sideband Cooling Micromechanical Motion to the Quantum Ground State
• Radiation-pressure cooling and optomechanical instability of a micro-mirror
• Feedback cooling of a cantilever's fundamental mode below 5 mK
• Tunable backaction of a dc SQUID on an integrated micromechanical resonator

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• Q-factor control of a microcantilever by mechanical sideband excitation
• Classical non-Gaussian state preparation through squeezing in an opto-electromechanical resonator
• Combined feedback and sympathetic cooling of a mechanical oscillator coupled to ultracold atoms
• Efficient optomechanical mode-shape mapping of micromechanical devices