Zhang Jian-Song, Chen Ai-Xi
Opt Express. 2020 Apr 27;28(9):12827-12836. doi: 10.1364/OE.389588.
We propose a scheme for the generation of strong mechanical squeezing beyond 3dB in hybrid atom-optomechanical systems in the highly unresolved sideband (HURSB) regime where the decay rate of cavity is much larger than the frequency of the mechanical oscillator. The system is formed by two two-level atomic ensembles and an optomechanical system with cavity driven by two lasers with different amplitudes. In the HURSB regime, the squeezing of the movable mirror can not be larger than 3dB if no atomic ensemble or only one atomic ensemble is put into the optomechanical system. However, if two atomic ensembles are put into the optomechanical system, the strong mechanical squeezing beyond 3dB is achieved even in the HURSB regime. Our scheme paves the way toward the implementation of strong mechanical squeezing beyond 3dB in hybrid atom-optomechanical systems in experiments.
我们提出了一种在高度未分辨边带（HURSB） regime 下的混合原子 - 光机械系统中产生超过3dB强机械压缩的方案，其中腔的衰减率远大于机械振子的频率。该系统由两个二能级原子系综和一个由两个不同振幅的激光驱动的带有腔的光机械系统组成。在HURSB regime 中，如果没有原子系综或仅将一个原子系综放入光机械系统中，可移动镜的压缩不能大于3dB。然而，如果将两个原子系综放入光机械系统中，即使在HURSB regime 中也能实现超过3dB的强机械压缩。我们的方案为在实验中实现混合原子 - 光机械系统中超过3dB的强机械压缩铺平了道路。
