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Entropy 2016, 18(1), 20; doi:10.3390/e18010020

Trusted Noise in Continuous-Variable Quantum Key Distribution: A Threat and a Defense

Department of Optics, Palacký University, 17. listopadu 1192/12, 77146 Olomouc, Czech Republic
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Academic Editor: Stefano Pirandola
Received: 21 May 2015 / Revised: 29 December 2015 / Accepted: 30 December 2015 / Published: 5 January 2016
(This article belongs to the Special Issue Quantum Cryptography)
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Abstract

We address the role of the phase-insensitive trusted preparation and detection noise in the security of a continuous-variable quantum key distribution, considering the Gaussian protocols on the basis of coherent and squeezed states and studying them in the conditions of Gaussian lossy and noisy channels. The influence of such a noise on the security of Gaussian quantum cryptography can be crucial, even despite the fact that a noise is trusted, due to a strongly nonlinear behavior of the quantum entropies involved in the security analysis. We recapitulate the known effect of the preparation noise in both direct and reverse-reconciliation protocols, as well as the detection noise in the reverse-reconciliation scenario. As a new result, we show the negative role of the trusted detection noise in the direct-reconciliation scheme. We also describe the role of the trusted preparation or detection noise added at the reference side of the protocols in improving the robustness of the protocols to the channel noise, confirming the positive effect for the coherent-state reverse-reconciliation protocol. Finally, we address the combined effect of trusted noise added both in the source and the detector. View Full-Text
Keywords: quantum cryptography; quantum optics; quantum key distribution; continuous variables; quantum entanglement; coherent states; squeezed states quantum cryptography; quantum optics; quantum key distribution; continuous variables; quantum entanglement; coherent states; squeezed states
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Usenko, V.C.; Filip, R. Trusted Noise in Continuous-Variable Quantum Key Distribution: A Threat and a Defense. Entropy 2016, 18, 20.

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