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题名:
Quantum teleportation and entanglement distribution over 100-kilometre free-space channels
作者: Yin, Juan1; Ren, Ji-Gang1; Lu, He1; Cao, Yuan1; Yong, Hai-Lin1; Wu, Yu-Ping1; Liu, Chang1; Liao, Sheng-Kai1; Zhou, Fei1; Jiang, Yan1; Cai, Xin-Dong1; Xu, Ping1; Pan, Ge-Sheng1; Jia, Jian-Jun2; Huang, Yong-Mei3; Yin, Hao1; Wang, Jian-Yu2; Chen, Yu-Ao1; Peng, Cheng-Zhi1; Pan, Jian-Wei1
刊名: Nature
出版日期: 2012
卷号: 488, 期号:7410, 页码:185-188
学科分类: accuracy assessment - channel - communication - frequency analysis - quantum mechanics
DOI: 10.1038/nature11332
通讯作者: Chen, Y.-A. (yuaochen@ustc.edu.cn)
文章类型: 期刊论文
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.
收录类别: SCI ; Ei
项目资助者: Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Fundamental Research Program [2011CB921300]
语种: 英语
WOS记录号: WOS:000307267000027
ISSN号: 00280836
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ioe.ac.cn/handle/181551/4117
Appears in Collections:光电工程总体研究室(一室)_期刊论文

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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

Recommended Citation:
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.
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