相干驱动原子-腔量子电动力学系统中光子的关联特性研究  

Correlation Properties of Photons in Coherently Driven Atom-Cavity Quantum Electrodynamics System

作　　者：周英[1] 朱成杰 Zhou Ying;Zhu Chengjie(School of Physics Science and Engineering,Tongji University,Shanghai 200092,China;School of Physical Science and Technology,Soochow University,Suzhou 215006,Jiangsu,China)

机构地区：[1]同济大学物理科学与工程学院,上海200092 [2]苏州大学物理科学与技术学院,江苏苏州215006

出　　处：《光学学报》2022年第21期53-59,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61975154)。

摘　　要：研究了相干驱动原子与单模腔强耦合时的光子关联特性,以及非对称耦合时集体效应对平均光子数和光子关联性质的影响。分析发现:在弱驱动情况下,驱动原子可以实现单光子阻塞现象,腔内溢出光子遵从亚泊松统计分布,呈现反聚束状态。同时,两原子之间的距离影响缀饰能级,当两原子的耦合相位差大于90°时,非对称耦合导致在中心频率处出现很强的光子激发。由于共振效应,腔内光子呈现出很强的聚束性。随着驱动场强度的增加,两侧边峰处的光子数逐渐增加,双光子激发占主导,从而可以实现双光子阻塞现象,即光子成对出现。本系统为研究集体效应导致的量子光学现象提供良好平台。The photon correlation properties of coherently driven atoms strongly coupled with a singlemode cavity and the influence of collective effect on the mean photon number and photon correlation properties in asymmetric coupling are studied in this paper.Under weak pump field excitation,the driven atom can realize the single photon blockade effect,and the overflow photons from the cavity follow the subPoisson statistics,showing the antibunching state.Additionally,the distance between two atoms affects the dressed energy level.When the couping phase difference of two atoms is greater than 90°,the asymmetric coupling results in strong photon excitation at the central frequency.Due to the resonance effect,the intracavity photons exhibit strong bunching behavior.As the intensity of the driving field increases,the number of photons at both sides of the edge gradually rises and the twophoton excitation becomes dominant,which can realize the twophoton blockade,namely that photons appear in pairs.The present system provides a good platform for studying quantum optical phenomena due to collective effects.

关 键 词：物理光学 光子阻塞 亚泊松分布 反聚束态 关联函数 

分 类 号：O431.2[机械工程—光学工程]