On multipartite symmetric states in Quantum Information Theory

Performance of the quantum MaxEnt estimation in the presence of physical symmetries

“…An analogous analysis can also be performed for Werner states, the other case under study that we have presented in this work. To completely determine a Werner state, one can specify the mean values tr(ρV π ), where {V π } is the set of matrices associated to the representation of the permutation group [36]. Thus, in order to compute how many independent parameters are associated to an N -qubit Werner state, one has to compute the number of linearly independent matrices V π .…”