Ⅰ类量子纠缠实验教学系统

Experimental teaching system of type-Ⅰ quantum entanglement

为使量子纠缠实验更好地服务于本科生基础实验教学,自建了I类纠缠源实验教学系统.采用2块光轴相互垂直的薄片BBO晶体粘合,并调整泵浦光偏振与光轴成45°入射,在粘合面附近位置产生的下转换光锥交叠部分将形成量子纠缠.由于I类源产生的光子对偏振相同,从而避免建立补偿系统,降低了纠缠点空间定位的精度要求和操作难度,简化接收装置,同时保持原实验中的核心原理和操作训练要求,本科生在1~2次实验课中达到教学设定要求.

The experimental teaching system of type-Ⅰ quantum entanglement was built in order to make the experimental teaching of quantum entanglement more expansive for the undergraduates and to improve the service quality for the experimental teaching.Two spliced thin pieces of BBO crystals which had perpendicular optical axes were used in the new system.Entangled photon pairs in the overlapped light cones which generated from the space near splicing area were obtained when a pump laser having apolarization angle with their optical axes was incident.Because the polarizations of the pairs were the same,the compensation system becomes unnecessary.Furthermore,the requirement for the spatial precision and the operation difficulty could be reduced.Thus,we could offer a simplified experimental setup for which the core principles and operational training requirements were maintained.The undergraduates could achieve the teaching goals in 1or 2afternoons of experiments.