四组份不同频率连续变量纠缠态光场的产生  

Generation of Quadripartite Entangled Light Field with Continuous Variable at Different Frequencies

作　　者：肖楚 陈天豪 潘凯彦 梁素玲 俞友宾 陈爱喜 Xiao Chu;Chen Tianhao;Pan Kaiyan;Liang Suling;Yu Youbin;Chen Aixi(Key Laboratory of Optical Field Manipulation of Zhejiang Province,Department of Physics,Zhejiang Sci-Tech University,Hangzhou,Zhejiang 310018,China)

机构地区：[1]浙江理工大学物理系光场调控浙江省重点实验室,浙江杭州310018

出　　处：《光学学报》2022年第3期225-231,共7页Acta Optica Sinica

基　　金：国家自然科学基金(61975184);浙江理工大学引进人才科研启动项目(19062151-Y)。

摘　　要：量子纠缠态是开展量子信息工作的核心资源。提出在一块光学超晶格中通过有注入信号的非简并光学参量振荡级联一个和频过程,可以产生不同频率的四组份连续变量纠缠态光场的可行实验方案。首先泵浦光和注入信号光通过差频过程产生闲置光。然后泵浦光和闲置光在同一块光学超晶格中通过级联和频过程产生和频光。根据多组份连续变量纠缠的判定方法,从理论上证明泵浦光、信号光、闲置光与和频光场之间的量子纠缠特性。四组份纠缠特性随泵浦功率的增大而减弱,另外选取较大的注入信号功率、级联非线性过程的耦合参数和泵浦光衰减常数可以得到较好的四组份纠缠光场。该实验方案只用到一块光学超晶格就可以产生四色连续变量纠缠态光场,实验装置简单。The quantum entangled state is the key resource of quantum information.A feasible experimental scheme is proposed that a sum-frequency process is cascaded by a non-degenerate optical parametric oscillation with an injection signal in an optical superlattice,which can generate quadripartite continuous variable entangled light fields with different frequencies.First,the pump light and the injected signal light generate idle light through the difference frequency process.Then,the pump light and idle light generate sum-frequency light through a cascaded sum-frequency process in the same optical superlattice.According to the determination method of multi-component continuous variable entanglement,the characteristics of quantum entanglement among pump light,signal light,idle light,and sum-frequency light field are theoretically proved.The quadripartite entanglement characteristic decreases with the increase of pump power,and a better quadripartite entangled light field can be obtained by selecting larger injection signal power,coupling parameters of cascade nonlinear process and pump light attenuation constant.In this experimental scheme,a four-color continuous variable entangled light field can be generated by using only one optical superlattice,and the experimental device is simple.

关 键 词：量子光学 量子纠缠 连续变量 光学超晶格 准相位匹配 

分 类 号：O431.2[机械工程—光学工程]