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Protecting single-photon entanglement with practical entanglement source

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Abstract

Single-photon entanglement (SPE) is important for quantum communication and quantum information processing. However, SPE is sensitive to photon loss. In this paper, we discuss a linear optical amplification protocol for protecting SPE. Different from the previous protocols, we exploit the practical spontaneous parametric down-conversion (SPDC) source to realize the amplification, for the ideal entanglement source is unavailable in current quantum technology. Moreover, we prove that the amplification using the entanglement generated from SPDC source as auxiliary is better than the amplification assisted with single photons. The reason is that the vacuum state from SPDC source will not affect the amplification, so that it can be eliminated automatically. This protocol may be useful in future long-distance quantum communications.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant Nos. 11474168 and 61401222, the Natural Science Foundation of Jiangsu province under Grant No. BK20151502, the Qing Lan Project in Jiangsu Province, the open research fund of Key Lab of Broadband Wireless Communication and Sensor Network Technology under Grant No. NYKL201509 (Nanjing University of Posts and Telecommunications), the open research fund of National Mobile Communications Research Laboratory under Grant No. 2016D01 (Southeast University), the open research fund of The State Key Laboratory of Integrated Services Networks under Grant No. ISN17-04 (Xidian University) and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. College of Mathematics and Physics, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Lan Zhou

  2. The State Key Laboratory of Integrated Services Networks, Xidian University, Chengdu, 710000, China

    Lan Zhou, Yang Ou-Yang, Lei Wang & Yu-Bo Sheng

  3. Key Laboratory of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education, Nanjing, 210003, China

    Lan Zhou, Yang Ou-Yang, Lei Wang & Yu-Bo Sheng

  4. National Mobile Communications Research Laboratory, Southeast University, Nanjing, 211189, China

    Lei Wang

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  1. Lan Zhou
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Zhou, L., Ou-Yang, Y., Wang, L. et al. Protecting single-photon entanglement with practical entanglement source. Quantum Inf Process 16, 151 (2017). https://doi.org/10.1007/s11128-017-1601-3

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