脉冲光场作用下啁啾双光子量子特性研究  

Study on the Quantum Properties of Chirped Biphotons with a Pulse Pump

作　　者：李百宏[1] 炎正馨[1] 张涛[1] 李永放[2] 

机构地区：[1]西安科技大学理学院,陕西西安710054 [2]陕西师范大学物理学与信息技术学院,陕西西安710062

出　　处：《光学学报》2012年第4期256-261,共6页Acta Optica Sinica

基　　金：中国博士后科学基金特别资助(201003678);陕西省教育厅产业化项目(2011JG10);陕西省教育厅科研计划(2010JK675);西安市科技局工业应用技术研发项目[CXY1125(8)]资助课题

摘　　要：基于量子理论和非线性光学,研究了脉冲光场作用啁啾准相位匹配非线性晶体的第Ⅱ类自发参变下转换过程中,脉冲宽度和啁啾系数对产生的纠缠双光子特性及Hong-Ou-Mandel(HOM)量子干涉结果的影响。结果表明,啁啾系数一定时,随着脉冲宽度的增加,双光子谱的不可区分性降低,HOM量子干涉可见度下降。当脉冲宽度一定时,随着啁啾系数的增加使双光子谱带宽增加,HOM量子干涉陷落变窄,双光子谱的不可区分性增强,从而提高了相干精度和干涉可见度。理论上得到了超宽带的双光子谱和对应超窄的HOM量子干涉图。Based on nonlinear optics and quantum theory,the process of type-II spontaneous parametric down-conversion pumped by a pulsed laser is researched in quasi-phase-matched nonlinear crystal that has a linearly chirped wave vector.The influence of the pump band-width and chirp coefficient on the properties of chirped biphotons and Hong-Ou-Mandel（HOM） quantum interference are analyzed.It is shown that with the increase of the pump band-width,indistinguishability of biphotons and quantum interference visibility are diminished while chirp coefficient is a constant;In a constant pump band-width,as the chirp coefficient is increased,the bandwidth of chirped biphotons are also increased and HOM quantum interference dip becomes narrower,thus yields enhanced the interference resolution and quantum interference visibility.Ultrabroadband biphotons and ultranarrow HOM dip are generated in theory.

关 键 词：量子光学 啁啾双光子 第Ⅱ类自发参变下转换 Hong-Ou-Mandel量子干涉 脉冲 

分 类 号：O431.2[机械工程—光学工程] O437[理学—光学]