通过模拟湍流大气塑造纠缠光子
Shaping entangled photons through emulated turbulent atmosphere
摘要：
由大气湍流引起的散射是创建长的自由空间光学链路，特别是纠缠光子链路的主要挑战之一。由于纠缠光子固有的低信噪比和纠缠的脆弱性，经典的补偿方法很难应用于纠缠光子。我们最近表明，我们可以使用明亮的激光束泵浦自发参量下转换来控制纠缠光子之间的空间相关性，以补偿它们的散射。在这项工作中，我们应用泵浦整形技术来补偿混乱的纠缠光子之间的相关性，模拟大气湍流散射。我们使用空间光调制器和Kolmogorov湍流模型在实验室中模拟大气湍流，并使用泵浦优化将纠缠光子的信号增强了十五倍。我们表明这两个静态和动态仿真的气氛，并证明也补偿的高阶模式的散射。我们的结果可以打开大门，实现自由空间量子链与纠缠光子，用于应用，如量子密钥分发。
英文摘要：
Scattering by atmospheric turbulence is one of the main challenges in creating long free-space optical links, and specifically links of entangled photons. Classical compensation methods are hard to apply to entangled photons, due to inherently low signal to noise ratios and the fragility of entanglement. We have recently shown that we can use the bright laser beam that pumps spontaneous parametric down conversion to control the spatial correlations between entangled photons for compensating their scattering. In this work, we apply the pump-shaping technique to compensate for scrambling of correlations between entangled photons that scatter by emulated atmospheric turbulence. We use a spatial light modulator and Kolmogorov's turbulence model to emulate atmospheric turbulence in the lab, and enhance the entangled photons' signal by a factor of fifteen using pump optimization. We show this for both static and dynamic emulated atmosphere, and demonstrate also the compensation of the scattering of a higher-order mode. Our results can open the door towards realizing free-space quantum links with entangled photons, used in applications such as quantum key distribution.
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