Simple continuous-variable quantum key distribution scheme using a Sagnac-based Gaussian modulator

Huanxi Zhao; Huasheng Li; Yuehan Xu; Peng Huang; Tao Wang; Guihua Zeng

doi:10.1364/ol.458443

journal article Jun 02, 2022

Simple continuous-variable quantum key distribution scheme using a Sagnac-based Gaussian modulator

Huanxi Zhao Huasheng Li Yuehan Xu Peng Huang

Tao Wang

Guihua Zeng

Optics Letters Vol. 47 No. 12 pp. 2939 · Optica Publishing Group

View at Publisher Save 10.1364/ol.458443

Abstract

Continuous-variable quantum key distribution (CV-QKD) is a protocol that uses quantum mechanics to ensure that the distribution of an encryption key is secure even in the presence of eavesdroppers. The wide application of CV-QKD requires low cost, system simplicity, and system stability. However, owing to the particularity of Gaussian modulation in CV-QKD, an amplitude modulator (AM) and a bias controller are required, making the system structure complex and unstable. In this Letter, we achieve two-dimensional Gaussian modulation with only one phase modulator (PM) and a Sagnac ring structure, which significantly reduces the complexity of the system. We test the Gaussian modulation stability for 10 h, and the result shows that the expected secure key rate can be maintained at 80 kbit/s under a transmission distance of 50 km. This scheme opens up new, to the best of our knowledge, possibilities for a new generation of highly stable and simple CV-QKD systems.

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Metrics

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Citations

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References

Details

Published: Jun 02, 2022
Vol/Issue: 47(12)
Pages: 2939
License: View

Authors

H

Huanxi Zhao

Shanghai Jiao Tong University

H

Huasheng Li

Shanghai Xuntai Quantum Technology Co., Ltd.

Y

Yuehan Xu

Shanghai Jiao Tong University

P

Peng Huang

Shanghai Jiao Tong University; Shanghai Research Center for Quantum Sciences

T

Tao Wang

Shanghai Jiao Tong University; Shanghai Research Center for Quantum Sciences

G

Guihua Zeng

Shanghai Jiao Tong University; Shanghai Research Center for Quantum Sciences

Funding

National Natural Science Foundation of China Award: 61671287

Shanghai Municipal Science and Technology Major Project Award: 2019SHZDZX01

National Key Research and Development Program of China Award: 2016YFA0302600

the Key R&D Program of Guangdong province Award: 2020B030304002

Cite This Article

Huanxi Zhao, Huasheng Li, Yuehan Xu, et al. (2022). Simple continuous-variable quantum key distribution scheme using a Sagnac-based Gaussian modulator. Optics Letters, 47(12), 2939. https://doi.org/10.1364/ol.458443

Simple continuous-variable quantum key distribution scheme using a Sagnac-based Gaussian modulator

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