X i Π⊗2 i ⊗ψ (1−η) ⊗ψ (η) # = dTr h ψ(1−η) i Tr h ψ(η) i = d(G199) for the Haar case, while for the Clifford case one gets: ⃗I Q η,4 I = Tr

Wigner-Yanase-Dyson Skew Information Another measure of coherence is given by the Wigner-Yanase-Dyson (WYD) skew information [228– 230]