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Unconditional optimality of Gaussian attacks against continuous-variable quantum key distribution

par Garcia-Patron Sanchez, Raul ;Cerf, Nicolas
Référence Physical Review Letters, 97, page (190503)
Publication Publié, 2006

Article révisé par les pairs

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Résumé :

A fully general approach to the security analysis of continuous-variable quantum key distribution (CV-QKD) is presented. Provided that the quantum channel is estimated via the covariance matrix of the quadratures, Gaussian attacks are shown to be optimal against all collective eavesdropping strategies. The proof is made strikingly simple by combining a physical model of measurement, an entanglement-based description of CV-QKD, and a recent powerful result on the extremality of Gaussian states [M. M. Wolf, Phys. Rev. Lett. 96, 080502 (2006)10.1103/PhysRevLett.96.080502].