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

Journal Article · Mon Aug 15 00:00:00 EDT 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.72.024301· OSTI ID:20718231

Namiki, Ryo; Hirano, Takuya ^[1]

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1. 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)

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.

• OSTI ID: 20718231
• Journal Information: Physical Review. A, Vol. 72, Issue 2; Other Information: DOI: 10.1103/PhysRevA.72.024301; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AMPLIFIERS
ANNIHILATION OPERATORS
BEAM SPLITTING
DISTRIBUTION
EFFICIENCY
EIGENSTATES
INFORMATION THEORY
NOISE
OPTICS
QUADRATURES
QUANTUM COMPUTERS
QUANTUM CRYPTOGRAPHY
QUANTUM MECHANICS
QUANTUM TELEPORTATION
SECRECY PROTECTION