  We prove that the action of the Yangian algebra Y(sl_N) is better described
by the principal generators on the tensor product of the fundamental
representation and its dual. The generalized Bell states or maximally entangled
states are permuted by the principal generators in a dramatically simple manner
on the tensor product. Under the Yangian symmetry the new quantum number J^2 is
also explicitly computed, which gives an explanation for these maximally
entangled states.
