Lazy states, discordant states and entangled states for 2-qubit systems

摘要

We investigate the lazy states, entangled states and discordant states for2-qubit systems. We show that many lazy states are discordant, many lazy statesare entangled, and many mixed entangled states are not lazy. With theseinvestigations, we provide a laziness-discord-entanglement hierarchy diagramabout 2-qubit quantum correlations.