  Effect of Lorentz transformation on some properties of multi-qubit systems is
investigated. It is shown that, properties like, the fidelity and entanglement
decay as the Wigner's angles increase, but can be improved, if all the
transformed particles are transformed with the same Wigner's angles. The upper
bounds of the average capacity of the GHZ state increases while it decreases
and more robust with the W-state as the Wigner's angle of the observer
decreases. Under Lorentz transformation, the tripartite states transform into
another equivalent states and hence no change on the efficiency of these states
to perform quantum information tasks.
