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arXiv 1206.4459quant-phcond-mat.mes-hallphysics.optics
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利用光热力改善光机械纠缠和冷却

Improving the optomechanical entanglement and cooling by photothermal force

Mehdi Abdi, Ali Reza Bahrampour

摘要:

研究了辐射压力和光热力耦合作用下光机系统的冷却和纠缠。为了建立光热模型,我们推导了力的变形常数的表达式。利用线性化的量子朗之万方程,我们研究这样的系统的动力学。根据我们的分析,除了辐射压力和光热力的单独作用外,它们的互相关效应在系统动力学中起着重要的作用。我们还得到了这类系统中机械谐振子的声子数的精确关系式,并在弱耦合极限下得到了它的解析表达式。在强耦合区,我们发现利用光热压力可以使基态冷却更接近。详细研究了光热作用对光机纠缠的影响。根据我们精确的数值计算和近似的解析研究,尽管光热力是一种自然的耗散力,但它可以在定量和定性上改善光机纠缠。

英文摘要:

Cooling and Entanglement in optomechanical systems coupled through radiation pressure and photothermal force is studied. To develop the photothermal model, we derive an expression for deformation constant of the force. Exploiting linearized quantum Langevin equations we investigate dynamics of such systems. According to our analysis, in addition to separate action of radiation pressure and photothermal force, their cross correlation effect plays an important role in dynamics of the system. We also achieve an exact relation for the phonon number of the mechanical resonator in such systems, and then we derive an analytical expression for it at weak coupling limit. At strong coupling regime, we show that utilizing the photothermal pressure makes the ground state cooling more approachable. The effect of photothermal force on the optomechanical entanglement is investigated in detail. According to our exact numerical and approximate analytical studies, even though the photothermal force is naturally a dissipative force, it can improve the optomechanical entanglement both quantitatively and qualitatively.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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