Reconciliation of a Quantum-Distributed Gaussian Key

Abstract

Two parties, Alice and Bob, wish to distill a binary secret key out of a list of correlated variables that they share after running a quantum key distribution protocol based on continuous-spectrum quantum carriers. We present a novel construction that allows the legitimate parties to get equal bit strings out of correlated variables by using a classical channel, with as few leaked information as possible. This opens the way to securely correcting non-binary key elements. In particular, the construction is refined to the case of Gaussian variables as it applies directly to recent continuous-variable protocols for quantum key distribution.

8 pages, 4 figures. Submitted to the IEEE for possible publication. Revised version to improve its clarity

References in corpus (10)

• Quantum Cryptography
• Continuous variable quantum cryptography using coherent states
• Quantum key distribution using gaussian-modulated coherent states
• Continuous variable quantum cryptography
• Quantum cryptography with squeezed states
• Quantum Distribution of Gaussian Keys with Squeezed States
• Fast, efficient error reconciliation for quantum cryptography
• Quantum cryptography with a predetermined key, using continuous variable Einstein-Podolsky-Rosen correlations
• Quantum key distribution with bright entangled beams
• The Mach-Zehnder and the Teleporter

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