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hybrid linear amplifier-involved detection for continuous variable quantum key distribution with thermal states

Chinese Physics B 2020年第5期29卷 132-141页

作者： Yu-Qian He Yun Mao Hai Zhong Duang Huang Ying Guo School of Automation Central South UniversityChangsha 410083China School of Computer Science and Engineering Central South UniversityChangsha 410083China

Continuous-variable quantum key distribution(CVQKD)can be integrated with thermal states for short-distance wireless quantum ***,its performance is usually restricted with the practical thermal *** propose a method to improve the security threshold of thermal-state(TS)CVQKD by employing a heralded hybrid linear amplifier(HLA)at the *** find the effect of thermal noise on the HLA-involved scheme in near-and-mid infrared band or terahertz band for direct and reverse *** simulations show that the HLA-involved scheme can compensate for the detriment of thermal noise and hence increase the security threshold of *** near-and-mid infrared band,security threshold can be extended by 2.1 dB in channel loss for direct reconciliation and 1.6 dB for reverse reconciliation,whereas in terahertz band,security threshold can be slightly enhanced for the gain parameter less than 1 due to the rise in thermal noise.

关键词： continuous-variable quantum key distribution thermal state hybrid linear amplifier

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Improving source-in-the-middle continuous-variable quantum key distribution using a heralded hybrid linear amplifier

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Chinese Physics B 2023年第7期32卷 290-295页

作者：伍磊鑫冯艳艳周健 College of Computer and Information Engineering Central South University of Forestry and TechnologyChangsha 410004China

A hybrid linear amplifier is inserted at the output of the source-in-the-middle distribution protocol to overcome the shortcomings of the transmission *** modified protocol aims to maintain a high key rate for long-distance transmission under high *** has the potential to significantly broaden the application range of the continuous variable quantum key distribution *** effects of amplifier parameters and noise on the modified protocol are analyzed in detail with regard to applying it to a practical *** make the simulation more realistic,the effect of finite size on the new protocol is taken into *** will serve as a guideline for the future use of hybrid linear *** parameters can be adjusted to achieve the best performance for key rates of different quantum channels.

关键词： hybrid linear amplifier source-in-the-middle distribution finite-size analysis

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