Phys. Rev. A 72, 024301 (2005) [4 pages]Security of continuous-variable quantum cryptography using coherent states: Decline of postselection advantageReceived 19 March 2005; published 5 August 2005 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.72.024301
DOI:
10.1103/PhysRevA.72.024301
PACS:
03.67.Dd, 42.50.Lc
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