Quantum versus classical correlations in Gaussian states

Quantum versus classical correlations in Gaussian states

Seminar author:Gerardo Adesso

Event date and time:07/08/2010 01:00:pm

Event location:IFAE seminar room

Event contact:

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.