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Performance Improvement of Two-way Quantum Key Distribution by Using a Heralded Noiseless Amplifier

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Abstract

We show the successful use of a heralded noiseless linear amplifier on the detection stage in the two-way continuous-variable quantum key distribution to improve the performance. Due to the excess noise, the secret-key rate of the two-way protocol becomes negative for a certain distance of transmission. The use of a heralded noiseless linear amplifier increases this distance by the equivalent of 20 log10 g dB of losses, and it also helps the two-way protocol tolerate more excess noise.

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Acknowledgments

This work is supported by the National Natural Science Foundation of China (Grant Nos. 61475099, 61102053, 61379153), Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices (NoKF201405), the Scientific Research Foundation for the Returned Overseas Scholars, State Education Ministry, SMC Excellent Young Faculty program, SJTU 2011, Chun-Tsung Program of SJTU, and PRP (Grant No. T03023051).

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Authors and Affiliations

  1. State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai, China

    Chenyang Li, Ruihang Miao & Guangqiang He

  2. Department of Electronic Engineering, Shanghai Jiaotong University, Shanghai, China

    Xinbao Gong

  3. School of Information Science and Engineering, Central South University, Changsha, China

    Ying Guo

  4. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China

    Guangqiang He

  5. Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou, China

    Guangqiang He

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  1. Chenyang Li
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  2. Ruihang Miao
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  3. Xinbao Gong
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  4. Ying Guo
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  5. Guangqiang He
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Correspondence to Guangqiang He.

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Li, C., Miao, R., Gong, X. et al. Performance Improvement of Two-way Quantum Key Distribution by Using a Heralded Noiseless Amplifier. Int J Theor Phys 55, 2199–2211 (2016). https://doi.org/10.1007/s10773-015-2859-9

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  • DOI: https://doi.org/10.1007/s10773-015-2859-9

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