We study reservoir-engineered entanglement for a cascaded bosonic system consisting of three modes, where the adjacent pairs couple to each other via both the beam-splitter interaction and the coherent parametric interaction with the interaction strengths being tunable. We focus on an optomechanical realization of the model by combining a nondegenerate parametric amplifier and an auxiliary cavity. A great steady-state cavity-mechanical entanglement can be achieved by optimizing the ratio of the interaction strengths, where the optomechanical cavity enacts the cold reservoir, simultaneously laser cooling the pair of hybrid modes delocalized over the auxiliary cavity and the mechanical oscillator. In comparison with the case of cooling a single delocalized mode, the dual-mode cooling approach allows one to obtain a greater amount of entanglement with higher cooling efficiencies and to explore strong entanglement in much broader parameter regions, where the rotating-wave approximation fails for the single-mode cooling case. Moreover, we show that the steady-state cavity-mechanical entanglement is robust to the mechanical thermal noise of the high temperature. The improved reservoir engineering approach can potentially be generalized to other bosonic systems with asymmetric beam-splitter and parametric interactions.

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通过单储气罐的双模冷却进行工程光机械纠缠

我们研究了由三个模式组成的级联玻色子系统的储层工程纠缠，其中相邻对通过分束器相互作用和相干参量相互作用彼此耦合，且相互作用强度可调。我们通过结合非简并参量放大器和辅助腔专注于模型的光机械实现。通过优化相互作用强度的比率，可以实现很大的稳态腔-机械纠缠，其中光机械腔充当冷库，同时激光冷却在辅助腔和机械振荡器上散布的一对混合模态。与冷却单个离域模式相比，双模冷却方法允许人们以更高的冷却效率获得更多的纠缠，并在更宽的参数区域探索强纠缠，在单模冷却情况下，旋转波逼近失败。此外，我们表明稳态腔-机械纠缠对高温的机械热噪声是鲁棒的。改进的油藏工程方法可以潜在地推广到其他具有非对称分束器和参数相互作用的玻色子系统。我们表明稳态腔-机械纠缠对高温的机械热噪声是鲁棒的。改进的油藏工程方法可以潜在地推广到其他具有非对称分束器和参数相互作用的玻色子系统。我们表明稳态腔-机械纠缠对高温的机械热噪声是鲁棒的。改进的油藏工程方法可以潜在地推广到其他具有非对称分束器和参数相互作用的玻色子系统。