Quantum versus classical correlations in Gaussian states

Seminar date and time: 
Thursday, 8 July, 2010 - 13:00
Affiliation: 
University of Nottingham
Author: 
Gerardo Adesso
Location: 
IFAE seminar room

Quantum discord, a measure of genuinely quantum correlations, is generalized to continuous variable systems. For all two-mode Gaussian states, we calculate analytically the quantum discord and a related measure of classical correlations, solving an optimization over all Gaussian measurements. Almost all two-mode Gaussian states are shown to have quantum correlations, while for separable states, the discord is smaller than unity. For a given amount of entanglement, it admits tight upper and lower bounds. While elucidating fundamental traits of continuous variable correlations, our findings are amenable to experimental verification by linear optics.

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