Experimental free-space quantum teleportation
Experimental free-space quantum teleportation
复制标题
实验性自由空间量子隐形传态
DOI：
10.1038/nphoton.2010.87
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发表时间：
2010-06-01
期刊：
影响因子：
35
通讯作者：
Pan, Jian-Wei
中科院分区：
文献类型：
--
作者：
Jin, Xian-Min;Ren, Ji-Gang;Pan, Jian-Wei
量子隐形传态（1）是量子通信（2，3）实际实现的核心。虽然第一个原理证明演示是在1997年由因斯布鲁克（4）和罗马小组（5）报道的，但到目前为止，长距离隐形传态仅在数百米长的光纤中实现（6，7）。光自由空间链路对于延长传输距离是非常理想的，因为其对于某些波长范围的低大气吸收。按照罗马方案（5），它允许一个完整的贝尔态测量，我们报告了超过16公里的量子隐形传态的自由空间实现。已开发出一种主动前馈技术，以实现实时信息传输。平均保真度为89%，远远超出了2/3的经典限制，实现。我们的实验已经实现了原始隐形传态方案的所有非局域方面，并且等价于它的局域幺正操作（5）。我们的结果证实了天基实验的可行性，是迈向全球范围量子通信应用的重要一步。
Quantum teleportation(1) is central to the practical realization of quantum communication(2,3). Although the first proof-of-principle demonstration was reported in 1997 by the Innsbruck(4) and Rome groups(5), long-distance teleportation has so far only been realized in fibre with lengths of hundreds of metres(6,7). An optical free-space link is highly desirable for extending the transfer distance, because of its low atmospheric absorption for certain ranges of wavelength. By following the Rome scheme(5), which allows a full Bell-state measurement, we report free-space implementation of quantum teleportation over 16 km. An active feed-forward technique has been developed to enable real-time information transfer. An average fidelity of 89%, well beyond the classical limit of 2/3, is achieved. Our experiment has realized all of the non-local aspects of the original teleportation scheme and is equivalent to it up to a local unitary operation(5). Our result confirms the feasibility of space-based experiments, and is an important step towards quantum-communication applications on a global scale.