论文标题
通过塑造输入光束轮廓来增加两光孔纠缠的尺寸
Increasing two-photon entangled dimensions by shaping input beam profiles
论文作者
论文摘要
在高维轨道角动量（OAM）自由度（DOF）中纠缠的光子对已被广泛认为是提高量子信息处理能力的可能来源。因此，非常需要在OAM DOF中产生高维最大纠结状态的需求。在这项工作中，我们展示了一种简单的方法，可以生成更宽，更平坦的OAM光谱，即通过修改泵束轮廓通过自发参数下转换产生的纠缠光子对纠缠的光子对的较大螺旋带宽（SB）。通过实验和理论上研究，我们发现与高斯泵相比，用于OAM检测的单模纤维模式曲线的指数泵轮廓将提供更大的SB。
Photon pair entangled in high dimensional orbital angular momentum (OAM) degree of freedom (DOF) has been widely regarded as a possible source in improving the capacity of quantum information processing. The need for the generation of a high dimensional maximally entangled state in the OAM DOF is therefore much desired. In this work, we demonstrate a simple method to generate a broader and flatter OAM spectrum, i.e. a larger spiral bandwidth (SB), of entangled photon pairs generated through spontaneous parametric down-conversion by modifying the pump beam profile. By investigating both experimentally and theoretically, we have found that an exponential pump profile that is roughly the inverse of the mode profiles of the single-mode fibers used for OAM detection will provide a much larger SB when compared to a Gaussian shaped pump.
