通过Duffing非线性和腔内压缩光在高度不可分辨边带区域中的光机系统的大的和鲁棒的机械压缩
Large and robust mechanical squeezing of optomechanical systems in a highly unresolved sideband regime via Duffing nonlinearity and intracavity squeezed light
摘要：
提出了一种利用Duffing非线性效应和腔内压缩光场在光机系统中产生强机械压缩的方案。该系统由一个具有Duffing非线性（机械非线性）和二阶非线性介质（光学非线性）的标准光机系统构成。在可分辨边带区，二阶非线性介质可能对机械压缩的产生起破坏作用。然而，它可以显著增加HURSB区域中的机械压缩（大于3dB）。最后，我们证明了机械压缩对机械谐振腔的热涨落是鲁棒的。在HURSB机制中产生的大而强的机械压缩是机械非线性和光学非线性的综合效应。
英文摘要：
We propose a scheme to generate strong and robust mechanical squeezing in an optomechanical system in the highly unresolved sideband (HURSB) regime with the help of the Duffing nonlinearity and intracavity squeezed light. The system is formed by a standard optomechanical system with the Duffing nonlinearity (mechanical nonlinearity) and a second-order nonlinear medium (optical nonlinearity). In the resolved sideband regime, the second-order nonlinear medium may play a destructive role in the generation of mechanical squeezing. However, it can significantly increase the mechanical squeezing (larger than 3dB) in the HURSB regime. Finally, we show the mechanical squeezing is robust against thermal fluctuations of the mechanical resonator. The generation of large and robust mechanical squeezing in the HURSB regime is a combined effect of the mechanical and optical nonlinearities.
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