LEVERRIER, Anthony; ALLEAUME, Romain; BOUTROS, Joseph; ZEMOR, Gilles; GRANGIER, Philippe

doi:10.1103/PhysRevA.77.042325

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LEVERRIER, Anthony
Ecole Nationale Supérieure des Télécommunications [ENST]
Laboratoire Charles Fabry de l'Institut d'Optique / Optique quantique

ALLEAUME, Romain
Ecole Nationale Supérieure des Télécommunications [ENST]

BOUTROS, Joseph
Texas A&M University System

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Physical Review A : Atomic, molecular, and optical physics [1990-2015]. 2008-04, vol. 77, n° 4, p. 042325

American Physical Society

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We propose a new method for extracting an errorless secret key in a continuous-variable quantum key distribution protocol, which is based on Gaussian modulation of coherent states and homodyne detection. The crucial novel feature is an eight-dimensional reconciliation method, based on the algebraic properties of octonions. Since the protocol does not use any postselection, it can be proven secure against arbitrary collective attacks, by using well-established theorems on the optimality of Gaussian attacks. By using this new coding scheme with an appropriate signal to noise ratio, the distance for secure continuous-variable quantum key distribution can be significantly extended.< Leer menos

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Multidimensional reconciliation for continuous-variable quantum key distribution

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