Experimental Demonstration of Underwater Decoy-state Quantum Key Distribution with All-optical Transmission

We demonstrate the underwater quantum key distribution (UWQKD) over a 10.4-meter Jerlov type III seawater channel by building a complete UWQKD system with all-optical transmission of quantum signals, synchronization signal and classical communication signal. The wavelength division multiplexing and...

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Published in:arXiv.org 2021-06
Main Authors: Yu, Yonghe, Li, Wendong, Yu, Wei, Yang, Yang, Dong, Shanchuan, Tian Qian, Wang, Shuo, Zhu, Qiming, Zheng, Shangshuai, Zhang, Xinjian, Gu, Yongjian
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Language:English
Subjects:
Attenuation
Optical communication
Quantum cryptography
Seawater
Synchronism
Underwater
Wavelength division multiplexing
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creator Yu, Yonghe
Li, Wendong
Yu, Wei
Yang, Yang
Dong, Shanchuan
Tian Qian
Wang, Shuo
Zhu, Qiming
Zheng, Shangshuai
Zhang, Xinjian
Gu, Yongjian
description We demonstrate the underwater quantum key distribution (UWQKD) over a 10.4-meter Jerlov type III seawater channel by building a complete UWQKD system with all-optical transmission of quantum signals, synchronization signal and classical communication signal. The wavelength division multiplexing and the space-time-wavelength filtering technology are applied to ensure that the optical signals do not interfere with each other. The system is controlled by FPGA, and can be easily integrated into watertight cabins to perform field experiment. By using the decoy-state BB84 protocol with polarization encoding, we obtain a secure key rate of 1.82Kbps and an error rate of 1.55% at the attenuation of 13.26dB. We prove that the system can tolerate the channel loss up to 23.7dB, therefore may be used in the 300-meter-long Jerlov type I clean seawater channel.
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subjects Attenuation
Optical communication
Quantum cryptography
Seawater
Synchronism
Underwater
Wavelength division multiplexing
title Experimental Demonstration of Underwater Decoy-state Quantum Key Distribution with All-optical Transmission
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