Satellite-based entanglement distribution over 1200 kilometers
Satellite-based entanglement distribution over 1200 kilometers
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DOI：
10.1126/science.aan3211
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发表时间：
2017-06-16
期刊：
影响因子：
56.9
通讯作者：
Pan, Jian-Wei
中科院分区：
文献类型：
--
作者：
Yin, Juan;Cao, Yuan;Pan, Jian-Wei
长距离纠缠分发对于量子物理的基础测试和可扩展的量子网络都是必不可少的。然而，由于信道损失，先前实现的距离被限制在100公里左右。在这里，我们展示了基于卫星的纠缠光子对分布到地球上相隔1203公里的两个位置，通过两个卫星到地面的下行链路，总长度从1600到2400公里不等。在严格的爱因斯坦定域性条件下，我们观察到了双光子纠缠的存在和对贝尔不等式的2.37 +/- 0.09的破坏。所获得的有效链路效率比通过电信光纤的两个光子的直接双向传输的效率高几个数量级。
Long-distance entanglement distribution is essential for both foundational tests of quantum physics and scalable quantum networks. Owing to channel loss, however, the previously achieved distance was limited to similar to 100 kilometers. Here we demonstrate satellite-based distribution of entangled photon pairs to two locations separated by 1203 kilometers on Earth, through two satellite-to-ground downlinks with a summed length varying from 1600 to 2400 kilometers. We observed a survival of two-photon entanglement and a violation of Bell inequality by 2.37 +/- 0.09 under strict Einstein locality conditions. The obtained effective link efficiency is orders of magnitude higher than that of the direct bidirectional transmission of the two photons through telecommunication fibers.