Gu Wen-Ju, Yi Zhen, Sun Li-Hui, Yan Yan
Opt Express. 2018 Nov 12;26(23):30773-30785. doi: 10.1364/OE.26.030773.
We discuss the generation of strong stationary mechanical squeezing and entanglement in the modulated two-and three-mode optomechanics. Following the reservoir engineering scheme, the beam-splitter and parametric optomechanical interactions can be simultaneously achieved through appropriately choosing the modulation frequency on mechanical motion, which is essential to strong squeezing and entanglement. In the two-mode modulated optomechanics, squeezing is tunable by the relative ratio of parametric and beam-splitter couplings, and also robust to thermal noise due to the simultaneously optically induced cooling process. In the three-mode modulated optomechanics, strong EPR-type entanglement is also attainable, which can surpass the 3dB limit of nondegenerate parametric interaction. However, the ideal entanglement is impossible since only one of mechanical Bogoliubov modes is cooled by the cavity mode, which also makes the entanglement fragile to the mechanical noise.
我们讨论了在调制的双模和三模光机械系统中强稳态机械压缩和纠缠的产生。按照量子库工程方案，通过适当选择机械运动的调制频率，可以同时实现分束器和参量光机械相互作用，这对于强压缩和纠缠至关重要。在双模调制光机械系统中，压缩可通过参量耦合与分束器耦合的相对比率进行调节，并且由于同时存在的光致冷却过程，对热噪声具有鲁棒性。在三模调制光机械系统中，也可实现强EPR型纠缠，其可超过非简并参量相互作用的3dB极限。然而，理想的纠缠是不可能实现的，因为只有一个机械玻戈留波夫模被腔模冷却，这也使得纠缠对机械噪声很脆弱。
