Quantum teleportation and entanglement distribution over 100-kilometre free-space channels

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	Quantum teleportation and entanglement distribution over 100-kilometre free-space channels
	Yin, Juan 1; Ren, Ji-Gang 1; Lu, He 1; Cao, Yuan 1; Yong, Hai-Lin 1; Wu, Yu-Ping 1; Liu, Chang 1; Liao, Sheng-Kai 1; Zhou, Fei 1; Jiang, Yan 1
刊名	Nature
	2012
卷号	488 期号:7410 页码:185-188
ISSN号	00280836
通讯作者	Chen, Y.-A. (yuaochen@ustc.edu.cn)
中文摘要	Transferring an unknown quantum state over arbitrary distances is essential for large-scale quantum communication and distributed quantum networks. It can be achieved with the help of long-distance quantum teleportation and entanglement distribution. The latter is also important for fundamental tests of the laws of quantum mechanics. Although quantum teleportation and entanglement distribution over moderate distances have been realized using optical fibre links, the huge photon loss and decoherence in fibres necessitate the use of quantum repeaters for larger distances. However, the practical realization of quantum repeaters remains experimentally challenging. Free-space channels, first used for quantum key distribution, offer a more promising approach because photon loss and decoherence are almost negligible in the atmosphere. Furthermore, by using satellites, ultra-long-distance quantum communication and tests of quantum foundations could be achieved on a global scale. Previous experiments have achieved free-space distribution of entangled photon pairs over distances of 600 metres (ref. 14) and 13 kilometres (ref. 15), and transfer of triggered single photons over a 144-kilometre one-link free-space channel. Most recently, following a modified scheme, free-space quantum teleportation over 16 kilometres was demonstrated with a single pair of entangled photons. Here we report quantum teleportation of independent qubits over a 97-kilometre one-link free-space channel with multi-photon entanglement. An average fidelity of 80.4 α 0.9 per cent is achieved for six distinct states. Furthermore, we demonstrate entanglement distribution over a two-link channel, in which the entangled photons are separated by 101.8 kilometres. Violation of the Clauser-Horne-Shimony-Holt inequality is observed without the locality loophole. Besides being of fundamental interest, our results represent an important step towards a global quantum network. Moreover, the high-frequency and high-accuracy acquiring, pointing and tracking technique developed in our experiment can be directly used for future satellite-based quantum communication and large-scale tests of quantum foundations. © 2012 Macmillan Publishers Limited. All rights reserved.
英文摘要	Transferring an unknown quantum state over arbitrary distances is essential for large-scale quantum communication and distributed quantum networks. It can be achieved with the help of long-distance quantum teleportation and entanglement distribution. The latter is also important for fundamental tests of the laws of quantum mechanics. Although quantum teleportation and entanglement distribution over moderate distances have been realized using optical fibre links, the huge photon loss and decoherence in fibres necessitate the use of quantum repeaters for larger distances. However, the practical realization of quantum repeaters remains experimentally challenging. Free-space channels, first used for quantum key distribution, offer a more promising approach because photon loss and decoherence are almost negligible in the atmosphere. Furthermore, by using satellites, ultra-long-distance quantum communication and tests of quantum foundations could be achieved on a global scale. Previous experiments have achieved free-space distribution of entangled photon pairs over distances of 600 metres (ref. 14) and 13 kilometres (ref. 15), and transfer of triggered single photons over a 144-kilometre one-link free-space channel. Most recently, following a modified scheme, free-space quantum teleportation over 16 kilometres was demonstrated with a single pair of entangled photons. Here we report quantum teleportation of independent qubits over a 97-kilometre one-link free-space channel with multi-photon entanglement. An average fidelity of 80.4 α 0.9 per cent is achieved for six distinct states. Furthermore, we demonstrate entanglement distribution over a two-link channel, in which the entangled photons are separated by 101.8 kilometres. Violation of the Clauser-Horne-Shimony-Holt inequality is observed without the locality loophole. Besides being of fundamental interest, our results represent an important step towards a global quantum network. Moreover, the high-frequency and high-accuracy acquiring, pointing and tracking technique developed in our experiment can be directly used for future satellite-based quantum communication and large-scale tests of quantum foundations. © 2012 Macmillan Publishers Limited. All rights reserved.
学科主题	accuracy assessment - channel - communication - frequency analysis - quantum mechanics
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000307267000027
内容类型	期刊论文
源URL	[http://ir.ioe.ac.cn/handle/181551/4117]
专题	光电技术研究所_光电工程总体研究室（一室）
作者单位	1.Department of Modern Physics, National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Shanghai 201315, China 2.Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China 3.Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
推荐引用方式 GB/T 7714	Yin, Juan,Ren, Ji-Gang,Lu, He,et al. Quantum teleportation and entanglement distribution over 100-kilometre free-space channels[J]. Nature,2012,488(7410):185-188.
APA	Yin, Juan.,Ren, Ji-Gang.,Lu, He.,Cao, Yuan.,Yong, Hai-Lin.,...&Pan, Jian-Wei.(2012).Quantum teleportation and entanglement distribution over 100-kilometre free-space channels.Nature,488(7410),185-188.
MLA	Yin, Juan,et al."Quantum teleportation and entanglement distribution over 100-kilometre free-space channels".Nature 488.7410(2012):185-188.