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Protecting single-photon entanglement with imperfect single-photon source

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Abstract

Photon noiseless linear amplification (NLA) is a powerful way to protect the single photon or single-photon entanglement (SPE) from photon loss. However, current NLA protocols for single photon or SPE usually require the local auxiliary single photon, but the ideal single-photon source is unavailable in current technology. In this paper, we investigate the NLA protocols for both single photon and SPE with imperfect single-photon source. We show that the quality of amplified quantum state greatly depends on the imperfect single-photon sources. The upper bound of the fidelity of the amplified quantum state is the fidelity of the single-photon source. In this way, in order to realize the amplification, we should require the fidelity of the single-photon source to be greater than the fidelity of the initial degraded state.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grant Nos. 11474168 and 61401222), the Qing Lan Project in Jiangsu Province, the 1311 Talent Plan in NJUPT, and the Priority Academic Development Program of Jiangsu Higher Education Institutions, China.

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Authors and Affiliations

  1. Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Yang Ou-Yang, Zhao-Feng Feng & Yu-Bo Sheng

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

    Yang Ou-Yang, Zhao-Feng Feng, Lan Zhou & Yu-Bo Sheng

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

    Lan Zhou

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  1. Yang Ou-Yang
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  2. Zhao-Feng Feng
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  3. Lan Zhou
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  4. Yu-Bo Sheng
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Correspondence to Yu-Bo Sheng.

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Ou-Yang, Y., Feng, ZF., Zhou, L. et al. Protecting single-photon entanglement with imperfect single-photon source. Quantum Inf Process 14, 635–651 (2015). https://doi.org/10.1007/s11128-014-0886-8

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  • DOI: https://doi.org/10.1007/s11128-014-0886-8

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