Improve the Maximum Transmission Distance of Four-State Continuous Variable Quantum Key Distribution by using a Noiseless Linear Amplifier
Bingjie Xu, Chunming Tang, Hui Chen, Wenzheng Zhang, and Fuchen Zhu
TL;DR
This paper proposes a modified four-state continuous variable quantum key distribution protocol that employs a noiseless linear amplifier to extend transmission distance and improve noise tolerance in lossy, noisy channels.
Contribution
It introduces a novel protocol integrating a noiseless linear amplifier to enhance maximum transmission distance in CVQKD.
Findings
Increased maximum loss tolerance by 20log(g) dB with NLA
Extended transmission distance in lossy channels
Improved noise resilience in CVQKD
Abstract
A modified four-state CVQKD protocol is proposed to increase the maximum transmission distance and tolerable excess noise in the presence of Gaussian lossy and noisy channel by using a noiseless linear amplifier (NLA). A NLA with amplitude gain g can increase the maximum admission losses by 20log(g) dB.
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