Algebraic characterization of<i>X</i>-states in quantum information
Algebraic characterization of<i>X</i>-states in quantum information
A class of two-qubit states called X-states are increasingly being used to discuss entanglement and other quantum correlations in the field of quantum information.Maximally entangled Bell states and "Werner" states are subsets of them.Apart from being so named because their density matrix looks like the letter X, there is not …