Concurrence and Wigner–Yanase Skew Information
Li Tang, Zeqian Chen · Chinese Physics Letters · 2006
A measure of entanglement on n qubits is defined in terms of Wigner–Yanase skew information. It is shown that the measure coincides essentially with the concurrence on two qubits. This uncovers the information-theoretic meaning of the concurrence of entangled states.