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

Experimental Demonstration of Post-Selection based Continuous Variable Quantum Key Distribution in the Presence of Gaussian Noise