Frequency-shifted-assisted continuous variable quantum key distribution with a local local oscillator based on Gaussian modulated coherent state
In person: 11 October 2021 • 13:00 - 14:30 China Standard Time
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.
Institute of Southwestern Communication (China)
Heng Wang received his Ph.D. degree in 2018 from the School of Optoelectronic Information at University of Electronic Science and Technology of China. Since 2018, he has been worked in Science and Technology on Communication Security Laboratory, Institute of Southwestern Communication. His research interests include quantum secure communication and microwave photonics. He has (co) authored more than 40 journal and conference papers.