Improve the Maximum Transmission Distance of Four-State Continuous Variable Quantum Key Distribution by using a Noiseless Linear Amplifier

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.

6 pages, 5 figures

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• Noiseless Linear Amplifiers in Entanglement-Based Continuous-Variable Quantum Key Distribution
• Ideal Quantum Tele-amplification up to a Selected Energy Cut-off using Linear Optics
• Noiseless linear amplification in quantum target detection using Gaussian states