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Improving the maximum transmission distance of continuous-variable quantum key distribution using a noiseless amplifier

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Improving the maximum transmission distance of continuous-variable quantum key distribution using a noiseless amplifier
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CC Attribution - NonCommercial - NoDerivatives 2.5 Switzerland:
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We show that the maximum transmission distance of continuous-variable quantum key distribution in presence of a Gaussian noisy lossy channel can be arbitrarily increased using a heralded noiseless linear amplifier. We explicitly consider a protocol using amplitude and phase modulated coherent states with reverse reconciliation. Assuming that the secret key rate drops to zero for a line transmittance Tlim, we find that a noiseless amplifier with amplitude gain g can improve this value to Tlim/g2, corresponding to an increase in distance proportional to logg.