CAJ | 학술논문

以相干诱导光子带隙结构为工作基础,提出了一种可对两个弱光信号的传播路径同时进行动态调控的新型全光路由控制方案。利用描述光波在空间周期介质中相干散射的传输矩阵理论,结合描述单频激光与多能级原子共振相互作用的密度矩阵方程,计算了作为控制媒介的相干驱动超冷原子系综的稳态反射光谱和稳态透射光谱。结果表明,通过改变两个较强相干激光的空间模式、强度和频率等参数,可在探测跃迁共振频率附近建立反射率约为95%或者透射率约为95%的两个特殊频带。对这样的相干诱导高反射带和高透射带进行了实时动态调控,可根据需要引导两个不同频率的弱光信号进入指定的网络通道。该方案很好地满足了在量子信息处理领域对弱光信号进行全光路由控制时的低损耗和低形变要求。
이상간유도광자대극결구위공작기출,제출료일충가대량개약광신호적전파로경동시진행동태조공적신형전광로유공제방안。이용묘술광파재공간주기개질중상간산사적전수구진이론,결합묘술단빈격광여다능급원자공진상호작용적밀도구진방정,계산료작위공제매개적상간구동초랭원자계종적은태반사광보화은태투사광보。결과표명,통과개변량개교강상간격광적공간모식、강도화빈솔등삼수,가재탐측약천공진빈솔부근건립반사솔약위95%혹자투사솔약위95%적량개특수빈대。대저양적상간유도고반사대화고투사대진행료실시동태조공,가근거수요인도량개불동빈솔적약광신호진입지정적망락통도。해방안흔호지만족료재양자신식처리영역대약광신호진행전광로유공제시적저손모화저형변요구。
On the basis of coherently induced photonic gap structures,a new all-optical routing control scheme is proposed to simultaneously control the propagation dynamics of two weak light signals.With the transfer-matrix method to describe the coherent scattering of light waves in periodic media and the density-matrix equations to describe the resonant interaction between monochromatic laser fields and multi-level atoms,the steady reflection and transmission spectra are calculated for a coherently driven ultra-cold atomic ensemble as the control medium.The results show that,by changing the spatial patterns,intensity,and frequencies of two strong laser fields,a pair of special frequency bands（with 95% reflectivity or 95% transmissivity） can be first established near the probe resonance and then be manipulated at any time to induce two weak light signals of different frequencies into the desired network channels.This scheme well satisfies the basic requirements of low-deformation and low-loss for all-optical routing control of weak light signals in the field of quantum information processing.