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Quantum teleportation and entanglement distribution over 100-kilometre free-space channels
Yin, Juan1,2; Ren, Ji-Gang1,2; Lu, He1,2; Cao, Yuan1,2; Yong, Hai-Lin1,2; Wu, Yu-Ping1,2; Liu, Chang1,2; Liao, Sheng-Kai1,2; Zhou, Fei1,2; Jiang, Yan1,2; Cai, Xin-Dong1,2; Xu, Ping1,2; Pan, Ge-Sheng1,2; Jia, Jian-Jun3; Huang, Yong-Mei4; Yin, Hao1,2; Wang, Jian-Yu3; Chen, Yu-Ao1,2; Peng, Cheng-Zhi1,2; Pan, Jian-Wei1,2
Source PublicationNATURE
AbstractTransferring 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(1,2) and entanglement distribution. The latter is also important for fundamental tests of the laws of quantum mechanics(3,4). Although quantum teleportation(5,6) and entanglement distribution(7-9) over moderate distances have been realized using optical fibre links, the huge photon loss and decoherence in fibres necessitate the use of quantum repeaters(10) for larger distances. However, the practical realization of quantum repeaters remains experimentally challenging(11). Free-space channels, first used for quantum key distribution(12,13), 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(16). Most recently, following a modified scheme(17), free-space quantum teleportation over 16 kilometres was demonstrated(18) 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 +/- 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(4) 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.
Indexed BySCI
WOS IDWOS:000307267000027
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
Citation statistics
Cited Times:186[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Univ Sci & Technol China, Natl Lab Phys Sci Microscale, Shanghai Branch, Shanghai 201315, Peoples R China
2.Univ Sci & Technol China, Dept Modern Phys, Shanghai 201315, Peoples R China
3.Chinese Acad Sci, Shanghai Inst Tech Phys, Shanghai 200083, Peoples R China
4.Chinese Acad Sci, Inst Opt & Elect, Chengdu 610209, Peoples R China
Recommended Citation
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.
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