Security of continuous-variable quantum cryptography using coherent states: Decline of postselection advantage

Ryo Namiki and Takuya Hirano
Phys. Rev. A 72, 024301 – Published 5 August 2005

Abstract

We investigate the security of continuous-variable (CV) quantum key distribution (QKD) using coherent states in the presence of quadrature excess noise. We consider an eavesdropping attack that uses a linear amplifier and a beam splitter. This attack makes a link between the beam-splitting attack and the intercept-resend attack (classical teleportation attack). We also show how postselection loses its efficiency in a realistic channel.

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  • Received 19 March 2005

DOI:https://doi.org/10.1103/PhysRevA.72.024301

©2005 American Physical Society

Authors & Affiliations

Ryo Namiki*

  • CREST Research Team for Photonic Quantum Information, Division of Materials Physics, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

Takuya Hirano

  • Department of Physics, Gakushuin University, Mejiro 1-5-1, Toshima-ku, Tokyo 171-8588, Japan

  • *Electronic address: namiki@qo.phys.gakushuin.ac.jp

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Issue

Vol. 72, Iss. 2 — August 2005

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