Degenerate optomechanical parametric oscillators: Cooling in the vicinity of a critical point
Degenerate optomechanical parametric oscillators: Cooling in the vicinity of a critical point
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DOI：
10.1103/physreva.93.023819
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发表时间：
2015-08
影响因子：
2.9
通讯作者：
Peter Degenfeld-Schonburg;M. Abdi;M. Hartmann;C. Navarrete-Benlloch
中科院分区：
文献类型：
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作者：
Peter Degenfeld-Schonburg;M. Abdi;M. Hartmann;C. Navarrete-Benlloch
简并光机参量振荡器是一种机械自由度耦合到腔模的光学谐振器，腔模通过外部泵浦激光器的参量下转换而被非线性放大。在临界泵浦功率以下，下变换场是纯量子力学的，这使得对这类系统的理论描述非常具有挑战性。在这里，我们介绍了一种能够描述这种制度的理论方法，即使在临界点本身也是如此。我们发现，向下转换的电场可以诱导显著的机械冷却，并确定了导致这一过程的加热冷却机制。此外，我们还发现，与天真的预期和半经典预测相反，在光子数最大的临界点，冷却并不是最优的。我们的方法为进一步分析临界点附近的混合耗散量子系统提供了可能。
Degenerate optomechanical parametric oscillators are optical resonators in which a mechanical degree of freedom is coupled to a cavity mode that is nonlinearly amplified via parametric down-conversion of an external pumping laser. Below a critical pumping power the down-converted field is purely quantum-mechanical, making the theoretical description of such systems very challenging. Here we introduce a theoretical approach that is capable of describing this regime, even at the critical point itself. We find that the down-converted field can induce significant mechanical cooling and identify the process responsible of this as a cooling-by-heating mechanism. Moreover, we show that, contrary to naive expectations and semi-classical predictions, cooling is not optimal at the critical point, where the photon number is largest. Our approach opens the possibility for analyzing further hybrid dissipative quantum systems in the vicinity of critical points.