Noise suppression for micromechanical resonator via intrinsic dynamic feedback |
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Authors: | Hou IAN Zhi-rui GONG Chang-pu SUN |
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Institution: | (1) Institute of Theoretical Physics, The Chinese Academy of Sciences, Beijing, 100080, China |
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Abstract: | We study a dynamic mechanism to passively suppress the thermal noise of a micromechanical resonator through an intrinsic self-feedback
that is genuinely non-Markovian. We use two coupled resonators, one as the target resonator and the other as an ancillary
resonator, to illustrate the mechanism and its noise reduction effect. The intrinsic feedback is realized through the dynamics
of coupling between the two resonators: the motions of the target resonator and the ancillary resonator mutually inthence
each other in a cyclic fashion. Specifically, the states that the target resonator has attained earlier will affect the state
it attains later due to the presence of the ancillary resonator. We show that the feedback mechanism will bring forth the
effect of noise suppression in the spectrum of displacement, but not in the spectrum of momentum.
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Keywords: | fluctuations cooling intrinsic feedback |
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