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Inseparability criterion for continuous variable systems

Lu-Ming Duan, G. Giedke, J. I. Cirac, P. Zoller

quant-pharXiv:quant-ph/9908056

Abstract

An inseparability criterion based on the total variance of a pair of Einstein-Podolsky-Rosen type operators is proposed for continuous variable systems. The criterion provides a sufficient condition for entanglement of any two-party continuous variable states. Furthermore, for all the Gaussian states, this criterion turns out to be a necessary and sufficient condition for inseparability.

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