Tight bound on coherent states quantum key distribution with heterodyne detection

Details Tight bound on coherent states quantum key distribution with heterodyne detection Tight bound on coherent states quantum key distribution with heterodyne detection

2007-04-11

arxiv.org/abs/0704.1371v1

Phys. Rev. A 76, 022332 (2007)

Physics

Quantum Physics

8 pages, 3 figures

Scientific paper

10.1103/PhysRevA.76.022332

We propose a new upper bound for the eavesdropper's information in the direct and reverse reconciliated coherent states quantum key distribution protocols with heterodyne detection. This bound is derived by maximizing the leaked information over the symplectic group of transformations that spans every physical Gaussian attack on individual pulses. We exhibit four different attacks that reach this bound, which shows that this bound is tight. Finally, we compare the secret key rate obtained with this new bound to the homodyne rate.

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