%0 Journal Article
%T Entanglement purification of Gaussian continuous variable quantum states
%A Lu-Ming Duan
%A G. Giedke
%A J. I. Cirac
%A P. Zoller
%J Physics
%D 1999
%I arXiv
%R 10.1103/PhysRevLett.84.4002
%X We describe an entanglement purification protocol to generate maximally entangled states with high efficiencies from two-mode squeezed states or from mixed Gaussian continuous entangled states. The protocol relies on a local quantum non-demolition measurement of the total excitation number of several continuous variable entangled pairs. We propose an optical scheme to do this kind of measurement using cavity enhanced cross--Kerr interactions.
%U http://arxiv.org/abs/quant-ph/9912017v2