摘要
宏观机械系统的量子操控无论是在基础物理学还是在高精度测量和量子信息处理等的应用上都非常重要。其中关键的一步是将机械系统冷却到它的量子基态。本文提出了一个光力系统，该系统包含了两个光学模式和一个与这两个光学模式都发生相互作用的机械模式。此外，这两个腔模还分别由两束光驱动。通过对哈密顿量进行变换以及求解系统的海森堡一郎之万方程，得到了机械振子最终平均声子数的表达式。结合作图发现，这个系统的特殊结构可以实现在不可分辨边带情况下机械振子的基态冷却，所以系统对腔的品质因子要求降低，实验上更容易实现。另外还发现，通过调节驱动光的功率可使得冷却效果达到最好。
Quantum manipulation of macroscopic mechanical system is of great improtance in both fundamental physics and applications ranging from high-precision metrology to quantum information processing. For these purposes, a crucial step has to be got to cool the mechanical system to its quantum ground state. In this paper, we propose an optomechanical system with two optical modes interacting with a common mechanical mode, and both the two cavity modes are driven by two lasers, respectively. This specific configuration of the system can lead to the ground-state cooling of the mechanical resonator in the unresolved-sideband regime. We analyze the effects of the squeezing parameter, the environment temperature, and the power of the driving laser on the final phonon number. It is found that a smaller squeezing parameter and a lower environment temperature are beneficial to the cooling. Becides an optimal laser power for the cooling has been found to make its cooling extreme.
作者
曹智伊
蔡秋华
於亚飞
张智明
CAO Zhi-yi;CAI Qiu-hua;YU Ya-fei;ZHANG Zhi-ming(Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China)
出处
《量子光学学报》
北大核心
2018年第2期170-177,共8页
Journal of Quantum Optics
基金
国家自然科学基金(11574092
61775062
61378012
91121023)
关键词
量子光学
光力系统
基态冷却
quantum optics
optomechanical system
ground state cooling
