Frequency-shifted-assisted continuous variable quantum key distribution with a local-local oscillator based on Gaussian modulated coherent state

Heng Wang; Xiaolan Liu; Yaodi Pi; Yun Shao; Yan Pan; Wei Huang; Yang Li; Bingjie Xu

doi:10.1117/12.2601414

9 October 2021 Frequency-shifted-assisted continuous variable quantum key distribution with a local-local oscillator based on Gaussian modulated coherent state

Heng Wang, Xiaolan Liu, Yaodi Pi, Yun Shao, Yan Pan, Wei Huang, Yang Li, Bingjie Xu

Author Affiliations +

Proceedings Volume 11905, Quantum and Nonlinear Optics VIII; 1190514 (2021) https://doi.org/10.1117/12.2601414
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

In this paper, a frequency-shifted-assisted continuous variable quantum key distribution with local local oscillator (LLOCVQKD) scheme is proposed based on Gaussian modulated coherent state. In the proposed scheme, the quantum signal and pilot tone can be completely isolated in frequency domain by frequency-shifting quantum optical carrier, so that the crosstalk from strong pilot tone to weak quantum signal can be effectively eliminated compared with our former pilottone scheme based on CS-DSB modulation. Moreover, an improved phase noise compensation scheme based on pilottone- assisted phase calibration and adaptive phase rotation is proposed for eliminating the dominate phase noise without the help of any training sequences, which promotes the blocks of the quantum key. Besides, a low level of excess noise is experimentally obtained for supporting the secure key rate of 7.15 Mbps over secure transmission distance of 25 km, verifying the simple and high-rate LLO-CVQKD.

Conference Presentation

Citation Download Citation

Heng Wang, Xiaolan Liu, Yaodi Pi, Yun Shao, Yan Pan, Wei Huang, Yang Li, and Bingjie Xu "Frequency-shifted-assisted continuous variable quantum key distribution with a local-local oscillator based on Gaussian modulated coherent state", Proc. SPIE 11905, Quantum and Nonlinear Optics VIII, 1190514 (9 October 2021); https://doi.org/10.1117/12.2601414

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