Mirror-field entanglement in a microscopic model for quantum optomechanics
Mirror-field entanglement in a microscopic model for quantum optomechanics
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量子光力学微观模型中的镜场纠缠
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
B. Hu
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文献类型：
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作者：
Kanu Sinha;Shih;B. Hu
我们使用了一个微观模型，即由Gley，Behuin和Hu[Phys.Rev.A 87,043832(2013年)]，描述了反射镜的质心(COM)运动和场之间的量子纠缠。与传统的将镜场纠缠理解为光场辐射压力引起镜面COM运动的方法不同，MOF模型包含了直接耦合到光场的镜面内部自由度的动力学。这种方法的主要优点是，它提供了对三个相关子系统(镜面的COM运动、镜面内部自由度和场)的自洽处理，包括它们彼此之间的反向作用，从而更准确地解释了各个子系统之间的量子关联。通过与量子场的动态相互作用，获得了反射镜的光学和力学性质，而不像传统的方法那样在场上附加任何边界条件。作为这种光学和力学耦合行为的自洽处理产生的新的物理特征之一，我们观察到量子关联通过其内部自由度从场到镜的相干转移。我们发现，在内部自由度粗粒化的情况下，光场与反射镜质心运动之间存在量子纠缠。进一步，我们证明了在一定的参数范围内，当场与反射镜的内部自由度发生共振作用时，镜场的纠缠增强，这一新的结果强调了在量子光学研究中考虑反射镜的内部结构的重要性。
We use a microscopic model, the Mirror-Oscillator-Field (MOF) model proposed by Galley, Behunin and Hu [Phys. Rev. A 87, 043832 (2013)], to describe the quantum entanglement between a mirror's center of mass (CoM) motion and a field. In contrast with the conventional approach where the mirror-field entanglement is understood as arising from the radiation pressure of an optical field inducing the motion of the mirror's CoM, the MOF model incorporates the dynamics of the internal degrees of freedom of the mirror that couple to the optical field directly. The major advantage in this approach is that it provides a self-consistent treatment of the three pertinent subsystems (the mirror's CoM motion, its internal degrees of freedom and the field) including their back-actions on each other, thereby giving a more accurate account of the quantum correlations between the individual subsystems. The optical and the mechanical properties of a mirror arising from its dynamical interaction with a quantum field are obtained without imposing any boundary conditions on the field additionally, as is done in the conventional way. As one of the new physical features that arise from this self-consistent treatment of the coupled optics and mechanics behavior we observe a coherent transfer of quantum correlations from the field to the mirror via its internal degrees of freedom. We find the quantum entanglement between the optical field and the mirror's center of mass motion upon coarse-graining over the internal degree of freedom. Further, we show that in certain parameter regimes the mirror-field entanglement is enhanced when the field interacts resonantly with the mirror's internal degree of freedom, a new result which highlights the importance of including the internal structure of the mirror in quantum optomechanical studies.