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• W2000598594 abstract "We present a study of the controllable nonlinear dynamics of a micromechanical beam coupled to a dc-SQUID (superconducting quantum interference device). The coupling between these systems places the modes of the beam in a highly nonlinear potential, whose shape can be altered by varying the bias current and applied flux of the SQUID. We detect the position of the beam by placing it in an optical cavity, which sets free the SQUID to be used solely for actuation. This enables us to probe the previously unexplored full parameter space of this device. We measure the frequency response of the beam and find that it displays a Duffing oscillator behavior which is periodic in the applied magnetic flux. To account for this, we develop a model based on the standard theory for SQUID dynamics. In addition, with the aim of understanding if the device can reach nonlinearity at the single phonon level, we use this model to show that the responsivity of the current circulating in the SQUID to the position of the beam can become divergent, with its magnitude limited only by noise. This suggests a direction for the generation of macroscopically distinguishable superposition states of the beam." @default.
• W2000598594 created "2016-06-24" @default.
• W2000598594 creator A5000876590 @default.
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• W2000598594 date "2015-01-06" @default.
• W2000598594 modified "2023-09-26" @default.
• W2000598594 title "Tunable strong nonlinearity of a micromechanical beam embedded in a dc-superconducting quantum interference device" @default.
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• W2000598594 doi "https://doi.org/10.1063/1.4905420" @default.
• W2000598594 hasPublicationYear "2015" @default.
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