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144 km以上纠缠和单光子的自由空间分布

Free-Space distribution of entanglement and single photons over 144 km

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. Oemer, M. Fue… 展开作者

R. Ursin, F. Tiefenbacher, T. Schmitt-Manderbach, H. Weier, T. Scheidl, M. Lindenthal, B. Blauensteiner, T. Jennewein, J. Perdigues, P. Trojek, B. Oemer, M. Fuerst, M. Meyenburg, J. Rarity, Z. Sodnik, C. Barbieri, H. Weinfurter, A. Zeilinger

备注：
10 pages including 2 figures and 1 table, Corrected typos
发表信息：
Nature Physics 3, 481 - 486 (2007)
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摘要：

量子纠缠是量子物理学的本质，激发了关于自然原理的基本问题。它也是量子密码学、量子隐形传态和量子计算等新兴量子信息处理技术的基础。贝尔的发现，即在纠缠量子系统上测量的相关性与局部现实图像不一致，导致了一系列实验证实了量子预测。然而，量子纠缠是否能像量子理论预测的那样在全球距离下生存，仍然是实验上未确定的。在这里，我们报告违反Clauser-Horne-Shimony-Holt（CHSH）不等式测量的两个观察员之间的144公里的加那利群岛的拉帕尔马和特内里费岛通过光学自由空间链路使用光学地面站（OGS）的欧洲航天局（欧空局）。此外，我们使用的纠缠对产生的量子密钥的实验条件和约束特性的空间到地面的实验。我们实验中的距离超过了以前所有自由空间实验的一个数量级以上，并利用了地基自由空间通信的限制;只有使用空中或天基平台才能达到更长的距离。由此实现的范围证明了量子通信在太空中的可行性，涉及卫星或国际空间站（ISS）。

英文摘要：

Quantum Entanglement is the essence of quantum physics and inspires fundamental questions about the principles of nature. Moreover it is also the basis for emerging technologies of quantum information processing such as quantum cryptography, quantum teleportation and quantum computation. Bell's discovery, that correlations measured on entangled quantum systems are at variance with a local realistic picture led to a flurry of experiments confirming the quantum predictions. However, it is still experimentally undecided whether quantum entanglement can survive global distances, as predicted by quantum theory. Here we report the violation of the Clauser-Horne-Shimony-Holt (CHSH) inequality measured by two observers separated by 144 km between the Canary Islands of La Palma and Tenerife via an optical free-space link using the Optical Ground Station (OGS) of the European Space Agency (ESA). Furthermore we used the entangled pairs to generate a quantum cryptographic key under experimental conditions and constraints characteristic for a Space-to-ground experiment. The distance in our experiment exceeds all previous free-space experiments by more than one order of magnitude and exploits the limit for ground-based free-space communication; significantly longer distances can only be reached using air- or space-based platforms. The range achieved thereby demonstrates the feasibility of quantum communication in space, involving satellites or the International Space Station (ISS).

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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