Experimental demonstration of post-selection-based continuous-variable quantum key distribution in the presence of Gaussian noise

Journal Article · Sat Sep 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.030303· OSTI ID:21015893

Symul, Thomas; Alton, Daniel J; Lance, Andrew M; Lam, Ping Koy ^[1]; Assad, Syed M ^[1]; Weedbrook, Christian ^[1]; Ralph, Timothy C ^[2]

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1. Quantum Optics Group, Department of Physics, Faculty of Science, Australian National University, ACT 0200 (Australia)
2. Department of Physics, University of Queensland, St Lucia, Queensland 4072 (Australia)

In realistic continuous-variable quantum key distribution protocols, an eavesdropper may exploit the additional Gaussian noise generated during transmission to mask her presence. We present a theoretical framework for a post-selection-based protocol which explicitly takes into account excess Gaussian noise. We derive a quantitative expression of the secret key rates based on the Levitin and Holevo bounds. We experimentally demonstrate that the post-selection-based scheme is still secure against both individual and collective Gaussian attacks in the presence of this excess noise.

• OSTI ID: 21015893
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DISTRIBUTION
NOISE
QUANTUM CRYPTOGRAPHY
QUANTUM INFORMATION
QUANTUM MECHANICS
SECURITY
TRANSMISSION