Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation

Yu, Chao; Zou, Shanhua; Mao, Yun; Guo, Ying

doi:10.3390/app10124175

Open AccessArticle

Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation

¹

School of Computer Science and Engineering, Central South University, Changsha 410083, China

²

School of Internet of Things Engineering, Wuxi Taihu University, Wuxi 214064, China

³

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

^*

Authors to whom correspondence should be addressed.

^†

These authors contributed equally to this work.

Appl. Sci. 2020, 10(12), 4175; https://doi.org/10.3390/app10124175

Submission received: 31 May 2020 / Revised: 14 June 2020 / Accepted: 15 June 2020 / Published: 17 June 2020

(This article belongs to the Special Issue Quantum Communications and Quantum Networks)

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Abstract

Establishing high-rate secure communications is a potential application of continuous-variable quantum key distribution (CVQKD) but still challenging for the long-distance transmission technology compatible with modern optical communication systems. Here, we propose a photon subtraction-induced plug-and-play scheme for enhancing CVQKD with discrete-modulation (DM), avoiding the traditional loopholes opened by the transmission of local oscillator. A photon subtraction operation is involved in the plug-and-play scheme for detection while resisting the extra untrusted source noise of the DM-CVQKD system. We analyze the relationship between secret key rate, channel losses, and untrusted source noise. The simulation result shows that the photon-subtracted scheme enhances the performance in terms of the maximal transmission distance and make up for the deficiency of the original system effectively. Furthermore, we demonstrate the influence of finite-size effect on the secret key rate which is close to the practical implementation.

Keywords: plug-and-paly; photon subtraction; discrete modulation; continuous-variable; quantum key distribution; quantum communications

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MDPI and ACS Style

Yu, C.; Zou, S.; Mao, Y.; Guo, Y. Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation. Appl. Sci. 2020, 10, 4175. https://doi.org/10.3390/app10124175

AMA Style

Yu C, Zou S, Mao Y, Guo Y. Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation. Applied Sciences. 2020; 10(12):4175. https://doi.org/10.3390/app10124175

Chicago/Turabian Style

Yu, Chao, Shanhua Zou, Yun Mao, and Ying Guo. 2020. "Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation" Applied Sciences 10, no. 12: 4175. https://doi.org/10.3390/app10124175

APA Style

Yu, C., Zou, S., Mao, Y., & Guo, Y. (2020). Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation. Applied Sciences, 10(12), 4175. https://doi.org/10.3390/app10124175

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Photon Subtraction-Induced Plug-and-Play Scheme for Enhancing Continuous-Variable Quantum Key Distribution with Discrete Modulation

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