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

2012/07/23 by Rémi Blandino, Anthony Leverrier, Marco Barbieri +3 · 3 citations
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum Computing Algorithms and Architecture #Quantum and electron transport phenomena

paper · pdf · doi:10.1103/physreva.86.012327

Abstract

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 T_lim, we find that a noiseless amplifier with amplitude gain g can improve this value to T_lim/g², corresponding to an increase in distance proportional to logg.

Citations

• Gaussian quantum information
• Efficiency of coherent-state quantum cryptography in the presence of loss: Influence of realistic error correction

Cited by

• Entanglement distribution via satellite: an evaluation of competing protocols assuming realistic free-space optical channels
• Surpassing the PLOB bound in continuous-variable quantum secret sharing using a state-discrimination detector
• A heralded quantum amplifier of multi-photon states

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