Multidimensional reconciliation for continuous-variable quantum key distribution

Details Multidimensional reconciliation for continuous-variable quantum key distribution Multidimensional reconciliation for continuous-variable quantum key distribution

2007-12-22

arxiv.org/abs/0712.3823v2

Phys. Rev. A 77, 042325 (2008)

Physics

Quantum Physics

8 pages, 3 figures

Scientific paper

10.1103/PhysRevA.77.042325

We propose a 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 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.

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