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Reconciliation of a Quantum-Distributed Gaussian Key

G. Van Assche·J. Cardinal·N. J. Cerf
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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.

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G. Van Assche, J. Cardinal, N. J. Cerf. 2002-12-24. Reconciliation of a Quantum-Distributed Gaussian Key. https://doi.org/10.1109/tit.2003.822618

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