  We propose an entanglement measure for two qudits based on the covariances of
a set of generators of the su(N) algebra. In particular, we represent this
measure in terms of the mutually unbiased projectors for N prime. For pure
states this measure quantify entanglement, we obtain an explicit expression
which relates it to the concurrence hierarchy, specifically the I-concurrence
and the 3-concurrence. For mixed states we propose a separability criterion.
