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Article Dans Une Revue Physical Review Research Année : 2020

Beyond linear coupling in microwave optomechanics

Résumé

We explore the nonlinear dynamics of a cavity optomechanical system. Our realization consisting of a drumhead nano-electro-mechanical resonator (NEMS) coupled to a microwave cavity, allows for a nearly ideal platform to study the nonlinearities arising purely due to radiation-pressure physics. Experiments are performed under a strong microwave Stokes pumping which triggers mechanical self-sustained oscillations. We analyze the results in the framework of an extended nonlinear optome-chanical theory, and demonstrate that quadratic and cubic coupling terms in the opto-mechanical Hamiltonian have to be considered. Quantitative agreement with the measurements is obtained considering only genuine geometrical nonlinearities: no thermo-optical instabilities are observed, in contrast with laser-driven systems. Based on these results, we describe a method to quantify nonlin-ear properties of microwave optomechanical devices. Such a technique, available now in the quantum electro-mechanics toolbox, but completely generic, is mandatory for the development of new schemes where higher-order coupling terms are proposed as a new resource, like Quantum Non-Demolition measurements, or in the search for new fundamental quantum signatures, like Quantum Gravity. We also find that the motion imprints a wide comb of extremely narrow peaks in the microwave output field, which could also be exploited in specific microwave-based measurements, potentially limited only by the quantum noise of the optical and the mechanical fields for a ground-state cooled NEMS device.
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Dates et versions

hal-02949631 , version 1 (25-09-2020)

Identifiants

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D. Cattiaux, Xin Zhou, S. Kumar, I. Golokolenov, R. R Gazizulin, et al.. Beyond linear coupling in microwave optomechanics. Physical Review Research, 2020, 2 (3), pp.033480. ⟨10.1103/PhysRevResearch.2.033480⟩. ⟨hal-02949631⟩
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