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International Conference on Quantum Information

Continuous Variable Quantum Key Distribution: Security, Repeaters and Relativity

Nathan Walk, Timothy C. Ralph, T. G. Downes, Thomas Symul, Ping Koy Lam

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We prove security of a continuous variable quantum key distribution protocol using post selection against non-Gaussian eavesdropper attacks. We discuss CV repeater protocols based on noiseless amplification. We analyze CV QKD between non-inertial, relativistic observers.
DOI
10.1364/icqi.2011.qmf4

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In realistic continuous variable quantum key distribution protocols, an eavesdropper may exploit the additional Gaussian noise generated during transmission to mask her presence. We present a theoretical framework for a post-selection based protocol which explicitly takes into account excess Gaussian noise. We derive a quantitative expression of the secret key rates based on the Levitin and Holevo bounds. We experimentally demonstrate that the post-selection based scheme is still secure against both individual and collective Gaussian attacks in the presence of this excess noise.
In realistic continuous variable quantum key distribution protocols, an eavesdropper may exploit the additional Gaussian noise generated during transmission to mask her presence. We present a theoretical framework for a post-selection based protocol which explicitly takes into account excess Gaussian noise. We derive a quantitative expression of the secret key rates based on the Levitin and Holevo bounds. We experimentally demonstrate that the post-selection based scheme is still secure against both individual and collective Gaussian attacks in the presence of this excess noise.
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