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We address the role of the phase-insensitive trusted preparation anddetection noise in the security of a continuous-variable quantum keydistribution, considering the Gaussian protocols on the basis of coherent andsqueezed states and studying them in the conditions of Gaussian lossy and noisychannels. The influence of such a noise on the security of Gaussian quantumcryptography can be crucial, even despite the fact that a noise is trusted, dueto a strongly nonlinear behavior of the quantum entropies involved in thesecurity analysis. We recapitulate the known effect of the preparation noise inboth direct and reverse-reconciliation protocols, as well as the detectionnoise in the reverse-reconciliation scenario. As a new result, we show thenegative role of the trusted detection noise in the direct-reconciliationscheme. We also describe the role of the trusted preparation or detection noiseadded at the reference side of the protocols in improving the robustness of theprotocols to the channel noise, confirming the positive effect for thecoherent-state reverse-reconciliation protocol. Finally, we address thecombined effect of trusted noise added both in the source and the detector.

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