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Quantum Information Processing

, Volume 14, Issue 2, pp 635–651 | Cite as

Protecting single-photon entanglement with imperfect single-photon source

  • Yang Ou-Yang
  • Zhao-Feng Feng
  • Lan Zhou
  • Yu-Bo Sheng
Article

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.

Keywords

Quantum communication Noiseless linear amplification   Single-photon entanglement 

Notes

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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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Yang Ou-Yang
    • 1
    • 2
  • Zhao-Feng Feng
    • 1
    • 2
  • Lan Zhou
    • 2
    • 3
  • Yu-Bo Sheng
    • 1
    • 2
  1. 1.Institute of Signal Processing TransmissionNanjing University of Posts and TelecommunicationsNanjingChina
  2. 2.Key Lab of Broadband Wireless Communication and Sensor Network Technology, Ministry of EducationNanjing University of Posts and TelecommunicationsNanjingChina
  3. 3.College of Mathematics and PhysicsNanjing University of Posts and TelecommunicationsNanjingChina

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