基于单腔光力学系统的连续变量量子导引研究  

Continuous Variable Quantum Steering Based on Single Cavity Optomechanical System

作　　者：杨鑫鑫 梁芸芸 杜培林 张静[1,2] YANG Xin-xin;LIANG Yun-yun;DU Pei-lin;ZHANG Jing(College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China;State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China)

机构地区：[1]山西大学物理电子工程学院,山西太原030006 [2]山西大学光电研究所量子光学与光量子器件国家重点实验室,山西太原030006

出　　处：《量子光学学报》2022年第4期311-319,共9页Journal of Quantum Optics

基　　金：国家自然科学基金(1874248,11874249);山西省自然科学基金(01801D121007)。

摘　　要：量子导引相较于其他量子纠缠类型的优势在于它具有天然的不对称性,可以实现单向、且一方设备不依赖的量子任务。本文研究了特殊条件下,即力学振子的频率刚好是腔的自由光谱区的一半时,由单泵浦的光力学系统中产生的三组份量子导引特性。研究结果表明:力学模对两个光模的导引要强于光模对力学模的导引,联合导引的能力要大于单个导引的能力,且通过调节失谐量或温度可以实现力学模和光模之间的单向导引和双向导引之间的转换。该研究对于实现更安全的量子通信和构建多频率系统混合的量子网络具有一定的参考价值。Quantum steering is an important quantum resource,which plays an important role in quantum information processing,quantum secure communication,quantum key distribution and other aspects.Compared with other kinds of quantum entanglements,quantum steering has the advantage of natural asymmetry,which can realize one-side device-independent quantum tasks.Quantum steering can be generated by beam splitter network,nonlinear process,optical frequency comb system and optomechanical system.In this paper,we consider incident single pump light into an optomechanical cavity containing a moving cavity mirror under special conditions,which is the frequency of the mechanical oscillator equal to half of the free spectral region of the cavity.Under the action of the radiation pressure of the light field,the mechanical mode can be coupled with the two cavity modes in the cavity,thus producing tripartite entanglement.We study the quantum steering properties of the entanglement region.The results show that the steering of mechanical mode to two optical modes is stronger than that of optical mode to mechanical mode,and the mechanical mode to optical mode steering is more robust to temperature,and the conversion between one-way steering and two-way steering between mechanical and optical modes can be realized by adjusting the detuning and the temperature.Because of the symmetry of the two optical modes,the exchange invariance of the two optical modes is obtained.The steering of mechanical mode and optical mode to single optical modes is stronger than the one-way steering of optical mode to optical mode.The combined steering of two optical modes to mechanical mode is greater than the sum of the steering of the single optical mode to mechanical mode.This research is valuable for realizing more secure quantum communication and constructing quantum networks composed of systems with different frequencies.

关 键 词：光力学系统 量子纠缠 量子导引 量子通信 

分 类 号：O431.2[机械工程—光学工程]