Practical Limitation for Continuous-Variable Quantum Cryptography using Coherent States

Ryo Namiki and Takuya Hirano
Phys. Rev. Lett. 92, 117901 – Published 16 March 2004

Abstract

In this Letter, first, we investigate the security of a continuous-variable quantum cryptographic scheme with a postselection process against individual beam splitting attack. It is shown that the scheme can be secure in the presence of the transmission loss owing to the postselection. Second, we provide a loss limit for continuous-variable quantum cryptography using coherent states taking into account excess Gausian noise on quadrature distribution. Since the excess noise is reduced by the loss mechanism, a realistic intercept-resend attack which makes a Gaussian mixture of coherent states gives a loss limit in the presence of any excess Gaussian noise.

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  • Received 20 May 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.117901

©2004 American Physical Society

Authors & Affiliations

Ryo Namiki* and Takuya Hirano

  • CREST Research Team for Photonic Quantum Information, 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. 92, Iss. 11 — 19 March 2004

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