两原子腔QED系统中的双光子吸收现象  

Two-Photon Absorption in Two-Atom Cavity Quantum Electrodynamics System

作　　者：敖云娜 许静平[1] 朱成杰 Ao Yunna;Xu Jingping;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40-44,共5页Acta Optica Sinica

基　　金：国家自然科学基金(61975154)。

摘　　要：详细研究了两原子腔量子电动力学系统中的双光子吸收现象。在自由空间中,由于存在量子干涉效应,两个不同频率的原子无法被同时激发。但是,在强耦合的腔量子电动力学系统中,原子与腔场间的耦合导致系统中出现新的跃迁通道,从而使双原子激发成为可能。通过数值模拟主方程,详细研究了两原子腔量子电动力学系统的光子激发谱,并与双光子激发谱进行比较,证明了双光子激发的可能性。通过进一步分析光子的二阶关联函数、双原子激发概率,揭示了腔内光子的统计性质和实现双原子激发的物理机制。The twophoton absorption in a twoatom cavity quantum electrodynamics(QED)system is studied in detail.In free space,two atoms of different frequencies cannot be excited at the same time because of the quantum interference effect.In the strongly coupled cavity QED system,however,the coupling between the atom and the cavity field leads to new transition channels,which makes diatomic excitation possible.The photon excitation spectrum of a twoatom cavity QED system is elaborately studied by the master equation of numerical simulation and is compared with the twophoton excitation spectrum,which proves the possibility of twophoton excitation.Further analysis of the secondorder correlation function and the diatomic excitation probability of the photon reveals the statistical properties of the photon in the cavity and the physical mechanism of diatomic excitation.

关 键 词：物理光学 强耦合 两原子腔 腔量子电动力学 双光子过程 

分 类 号：O431.2[机械工程—光学工程]