摘要
本文讨论了大气信道中轨道角动量纠缠光子对的纠缠度,并利用von Kaman大气湍流谱来建立双光子纠缠度的模型,分析了大气湍流对不同轨道角动量纠缠光子对纠缠度的影响.研究表明:在大气信道中,由于大气湍流的存在,纠缠光子对的纠缠度随着传输距离z的增加而减小;大气湍流强度越大,纠缠光子对的纠缠度下降的越快,纠缠光子对传输的距离越小;在湍流强度相同的大气信道轨道角动量指数越大的纠缠光子对,纠缠度下降得越慢,纠缠光子对传输的距离越远.
In this paper, we describe orbital angular momentum entangled photon pair entanglement in atmospheric channel. The Von Karman spectrum of turbulence is used to create a model of two-photon pair entanglement. The effects of atmospheric turbulence on the entanglement of entangled photon pairs of different orbital angular momentum bases are analyzed. The obtained results are as follows because of the presence of atmospheric turbulence, the entanglement of entangled photon pairs decreases with the increase of the propagation distance z in the atmosphere channel. The entanglement of the entangled photon pairs decreases with the increase of transmission distance. The bigger the turbulence intensity, the faster the entanglement decline and the shorter the propagation distanceis. In the same intensity of atmospheric turbulence of the atmospheric channel, the bigger the orbital angular momentum index, the slower the entanglement decline and the further the propagation distanceis.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第12期276-283,共8页
Acta Physica Sinica
基金
国家自然科学基金(批准号:60977054)
教育厅产业化培育项目(批准号:2010JC17)资助的课题~~
关键词
轨道角动量
纠缠态
大气湍流
纠缠度
orbital angular momentum, entangled state, atmospheric turbulence, entanglement
