I am trying to understand the relation between Fidelity and Concurrence for a two qubit maximally mixed state. When I calculate the Fidelity and Concurrence, I observe that Concurrence is zero whereas Fidelity is one.
In some of the papers, I read that the relation between Fidelity and Concurrence is $F = (c+2/3)$. But this violates the above observation.
Please let me know if I miss anything.
