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Reconciliation of a quantum-distributed Gaussian key

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3 Author(s)
Van Assche, G. ; Centre for Quantum Inf. & Commun., Univ. Libre de Bruxelles, Brussels, Belgium ; Cardinal, J. ; Cerf, Nicolas J.

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 (QKD) 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 little leaked information as possible. This opens the way to securely correcting nonbinary key elements. In particular, the construction is refined to the case of Gaussian variables as it applies directly to recent continuous-variable protocols for QKD.

Published in:

Information Theory, IEEE Transactions on  (Volume:50 ,  Issue: 2 )

Date of Publication:

Feb. 2004

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