Witnessing effective entanglement in a continuous variable prepare&measure setup and application to a QKD scheme using postselection
Quantum Physics
2009-11-13 v1
Abstract
We report an experimental demonstration of effective entanglement in a prepare&measure type of quantum key distribution protocol. Coherent polarization states and heterodyne measurement to characterize the transmitted quantum states are used, thus enabling us to reconstruct directly their Q-function. By evaluating the excess noise of the states, we experimentally demonstrate that they fulfill a non-separability criterion previously presented by Rigas et al. [J. Rigas, O. G\"uhne, N. L\"utkenhaus, Phys. Rev. A 73, 012341 (2006)]. For a restricted eavesdropping scenario we predict key rates using postselection of the heterodyne measurement results.
Cite
@article{arxiv.quant-ph/0603271,
title = {Witnessing effective entanglement in a continuous variable prepare&measure setup and application to a QKD scheme using postselection},
author = {S. Lorenz and J. Rigas and M. Heid and U. L. Andersen and N. Lütkenhaus and G. Leuchs},
journal= {arXiv preprint arXiv:quant-ph/0603271},
year = {2009}
}
Comments
12 pages, 12 figures, 2 tables