Practical limitation for continuous-variable quantum cryptography using coherent states

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 pr...

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Bibliographic Details
Published in:Physical review letters 2004-03, Vol.92 (11), p.117901.1-117901.4, Article 117901
Main Authors: NAMIKI, Ryo, HIRANO, Takuya
Format: Article
Language:English
Subjects:
Classical and quantum physics: mechanics and fields
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Optics
Physics
Quantum cryptography
Quantum fluctuations, quantum noise, and quantum jumps
Quantum information
Quantum optics
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Summary: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 Gaussian 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.92.117901