Plug-and-play dual-phase-modulated continuous-variable quantum key distribution with photon subtraction

doi:10.1007/s11467-019-0881-8

Front. Phys.

2019, Vol. 14

Issue (4) : 41501 https://doi.org/10.1007/s11467-019-0881-8

LETTER

Plug-and-play dual-phase-modulated continuous-variable quantum key distribution with photon subtraction

Xiao-Dong Wu, Yi-Jun Wang(

), Hai Zhong, Qin Liao, Ying Guo(

)

School of Automation, Central South University, Changsha 410083, China

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Abstract

Plug-and-play dual-phase-modulated continuous-variable quantum key distribution (CVQKD) protocol can effectively solve the security loopholes associated with transmitting local oscillator (LO). However, this protocol has larger excess noise compared with one-way Gaussian-modulated coherent-states scheme, which limits the maximal transmission distance to a certain degree. In this paper, we show a reliable solution for this problem by employing non-Gaussian operation, especially, photon subtraction operation, which provides a way to improve the performance of plug-and-play dual-phase-modulated CVQKD protocol. The photon subtraction operation shows experimental feasibility in the plug-andplay configuration since it can be implemented under current technology. Security results indicate that the photon subtraction operation can evidently enhance the maximal transmission distance of the plug-and-play dual-phase-modulated CVQKD protocol, which effectively makes up the drawback of the original one. Furthermore, we achieve the tighter bound of the transmission distance by considering the finite-size effect, which is more practical compared with that achieved in the asymptotic limit.

Keywords plug-and-play dual-phase-modulated continuous variable quantum key distribution photon subtraction

Corresponding Author(s): Yi-Jun Wang,Ying Guo

Issue Date: 26 March 2019

Cite this article:

Xiao-Dong Wu,Yi-Jun Wang,Hai Zhong, et al. Plug-and-play dual-phase-modulated continuous-variable quantum key distribution with photon subtraction[J]. Front. Phys. , 2019, 14(4): 41501.

URL:

https://academic.hep.com.cn/fop/EN/10.1007/s11467-019-0881-8
https://academic.hep.com.cn/fop/EN/Y2019/V14/I4/41501

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