Phys. Rev. A 76, 030303(R) (2007) [4 pages]Experimental demonstration of post-selection-based continuous-variable quantum key distribution in the presence of Gaussian 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.76.030303
DOI:
10.1103/PhysRevA.76.030303
PACS:
03.67.Dd, 42.50.Dv, 89.70.+c
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