论文标题
耗散耦合辅助激光冷却：限制和观点
Dissipative-coupling-assisted laser cooling: limitations and perspectives
论文作者
论文摘要
最近确定的可能性通过在红色侧带激发下的耗散和色散光学耦合组合[物理学[phys phys。 Rev. A 88，023850（2013）]目前被视为一个了不起的发现。我们对该方案进行了全面的分析，该协议揭示了其对小型缺陷的敏感性，例如额外的耗散，优化的实验环境的不准确性以及所采用的理论框架的不准确性。这些缺陷对冷却极限的影响进行了定量评估。从内部空腔衰减速率中发现了对冷却极限的非常强大的影响，即使与检测率相比，它甚至很小，也可能会大大推动这一限制，从而质疑基态冷却的可能性。具体而言，只有在内部衰减速率与检测率的比率比协议预测的冷却极限与公共分散偶联辅助辅助侧带冷却极限的比率小得多时，内部损失只能被忽略。更重要的是，我们确定该协议理论的适用性条件是要求后者比一个比率小得多。提出了有关冷却协议的详细比较与使用红色侧带激发或反馈的分散耦合辅助协议的详细比较。
The recently identified possibility of ground-state cooling of a mechanical oscillator in the unresolved sideband regime by combination of the dissipative and dispersive optomechanical coupling under the red sideband excitation [Phys. Rev. A 88, 023850 (2013)], is currently viewed as a remarkable finding. We present a comprehensive analysis of this protocol, which reveals its very high sensitivity to small imperfections such as an additional dissipation, the inaccuracy of the optimized experimental settings, and the inaccuracy of the theoretical framework adopted. The impact of these imperfections on the cooling limit is quantitatively assessed. A very strong effect on the cooling limit is found from the internal cavity decay rate which even being small compared with the detection rate may drastically push that limit up, questioning the possibility of the ground state cooling. Specifically, the internal loss can only be neglected if the ratio of the internal decay rate to the detection rate is much smaller than the ratio of the cooling limit predicted by the protocol to the common dispersive-coupling assisted sideband cooling limit. More over, we establish that the condition of applicability of theory of that protocol is the requirement that the latter ratio is much smaller than one. A detailed comparison of the cooling protocol in question with the dispersive-coupling-assisted protocols which use the red sideband excitation or feedback is presented.
