基于三拉盖尔高斯腔的机械振子基态冷却研究

Ground-State Cooling of Mechanical Resonator in Three-Laguerre-Gaussian-Cavity

将机械振子冷却到基态是实现机械振子量子操控的关键。利用电磁感应透明冷却法,研究了边带不可分辨区域中三拉盖尔高斯腔光力学系统的机械振子基态冷却。在该系统中,两个附加腔场分别与标准的腔光力学系统中的腔场发生了耦合。通过选择系统的最优参数,光学涨落谱从洛伦兹线型变成类似三能级原子系统中电磁诱导透明谱线的形式,冷却和加热速率的不对称使得机械振子被冷却到基态。研究结果为三拉盖尔高斯腔系统中机械振子的冷却提供了理论参考。

To cool a mechanical resonator to its ground-state is the key to realize the quantum manipulation of this mechanical resonator.We propose a cooling method based on electromagnetically-induced-transparency(EIT)and investigate the ground-state cooling of a mechanical resonator in a three-Laguerre-Gaussian-cavity optomechanical system,where two auxiliary cavities are coupled to the original one in the standard optomechanical system,respectively.When the optimal parameters are chosen,the optical fluctuation spectrum changes from Lorentzian shape to EIT-like one in a three-level atomic system.The asymmetry between cooling and heating rates makes it possible to realize the ground-state cooling of a mechanical resonator.The research results here provide a theoretical guidance for the cooling of mechanical resonators in three-Laguerre-Gaussian-cavity systems.