طرحواره‌هاي نظريِ تحقق‌پذيرِ كنترل اثرهاي غيركلاسيك درسامانه‌هاي الكترواپتومكانيك كوانتومي

We theoretically investigate the steady-state bipartite entanglements, mechanical ground-state cooling, an‎d mechanical quadrature squeezing in a hybrid electro op- tomechanical system where a moving membrane is linearly coupled to the microwave field mode of an LC circuit, while it simultaneously interacts both linearly an‎d quadratically with the radiation pressure of a single-mode optical cavity. We show that by choosing a suitable sign an‎d amplitude for the quadratic optomechanical coupling (QOC), one can achieve enhanced an‎d thermally robust stationary bipar- tite entanglement between the subsystems, improved mechanical ground-state cool- ing, an‎d Q-quadrature squeezing of the mechanical mode beyond the 3-dB limit of squeezing. In particular, we find that in the presence of QOC with positive sign the bipartite optical-microwave entanglement can be increased by about 2.25 times around the temperature of 1mK, an‎d it can be preserved against thermal noise up to the ambient temperature of 90mK. Furthermore, the QOC with positive sign can give rise to the enhancement of the mechanical ground-state cooling by about 1 order of magnitude in the optical an‎d microwave red-detuned regime. We also find that for the positive sign of QOC an‎d near the microwave resonance frequency the squeezing degree of the Q-quadrature of the mechanical mode can be amplified up to 15 dB. Such a hybrid electro-optomechanical system can serve as a promising platform to engineer an improved optical- microwave entangled source for microwave sensing as well as quantum information processing.

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