Related Experiment Video
Updated: Jun 8, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
Quantum versus classical correlations in Gaussian states
Gerardo Adesso1, Animesh Datta
1School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom.
Abstract:
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. Via a duality between entanglement and classical correlations, we derive a closed formula for the Gaussian entanglement of formation of a family of three-mode Gaussian states.
Related Concept Videos
The Quantum-Mechanical Model of an Atom
Quantum Numbers
2D NMR: Overview of Heteronuclear Correlation Techniques
Classical Mechanics
Gauss's Law
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)