标题： 二次耦合光机械系统中的机械压缩 显示英文标题

标题： Mechanical Squeezing in Quadratically-coupled Optomechanical Systems

摘要： 我们通过在单频激光的振幅上引入周期性调制来展示耗散光学机械系统中强机械压缩的产生。光学模式呈现二次耦合到机械振荡器，这有助于超过3 dB标准量子极限的强压缩。由于边带冷却，机械振荡器的Bogoliubov模式也冷却到了基态。我们进一步优化边带强度比以引入增强压缩。我们还比较了我们的结果与解析解（在绝热近似下）和精确数值解。即使有10^4声子的热占据，也能观察到超过3 dB的机械压缩和强光学机械纠缠。 显示英文摘要

摘要： We demonstrate the generation of a strong mechanical squeezing in a dissipative optomechanical system by introducing a periodic modulation in the amplitude of a single-tone laser driving the system. The mechanical oscillator is quadratically coupled to the optical mode, which contributes to a strong squeezing exceeding the 3-dB standard quantum limit. The Bogoliubov mode of the mechanical oscillator also cools down to its ground state due to sideband cooling. We further optimize this ratio of sideband strengths to introduce enhanced squeezing. We also compare our results with the analytical (under adiabatic approximation) and the exact numerical solution. Even for a thermal occupancy of 10^4 phonons, mechanical squeezing beyond 3 dB and a strong optomechanical entanglement is observed.