Unconditional Optimality of Gaussian Attacks against Continuous-Variable Quantum Key Distribution

Raúl García-Patrón and Nicolas J. Cerf
Phys. Rev. Lett. 97, 190503 – Published 10 November 2006

Abstract

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 et al., Phys. Rev. Lett. 96, 080502 (2006)].

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  • Received 4 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.190503

©2006 American Physical Society

Authors & Affiliations

Raúl García-Patrón and Nicolas J. Cerf

  • QuIC, Ecole Polytechnique, CP 165, Université Libre de Bruxelles, 1050 Bruxelles, Belgium

See Also

Optimality of Gaussian Attacks in Continuous-Variable Quantum Cryptography

Miguel Navascués, Frédéric Grosshans, and Antonio Acín
Phys. Rev. Lett. 97, 190502 (2006)

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Vol. 97, Iss. 19 — 10 November 2006

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