高保真偏振EPR纠缠态的制备  

Preparation of high fidelity polarization EPR entangled state

作　　者：赵加强[1] 逯怀新[1] 王晓芹[1] 

机构地区：[1]潍坊学院物理与电子科学系,山东省多光子纠缠与操纵重点实验室,山东潍坊261061

出　　处：《光电子．激光》2011年第5期711-713,共3页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60878001);潍坊学院博士科研基金资助项目(2009BS01)

摘　　要：通过优化参量下转换产生EPR(Einstein-Podolsky-Rosen)纠缠态的方案,采用符合计数和后选择方法,制备了高保真度的EPR偏振纠缠态。结果表明,EPR纠缠态的保真度达到近0.99,EPR纠缠对的量度达到3 500Hz,克服了纠缠态的保真度和量度不能同时提高的局限,为多光子纠缠态的制备和双光子量子通信提供了非常稳定的纠缠源。By optimizing the scheme of EinsteinPodolsky-Rsoen（EPR） by spontaneous parametric down-conversion and using the technique of coincidence counting and post selection,the high fidelity polarization EPR entangled state has been prepared.The results show that the fidelity of EPR entangled state approach as almost 0.99,and the coincidence rate can be more than 3 500 Hz.It overcomes the limit that the fidelity and intensity of entanged state can′t increase synchronously.A stationary entangle source is supplied for preparation of the multi-photon entangled state and two-photon quantum communication.

关 键 词：量子光学 纠缠态 参量下转换 保真度 

分 类 号：O431.2[机械工程—光学工程]