Region of fidelities for a 1→N universal qubit quantum cloner

► We examine a region of fidelities for a 1→N qubit quantum cloner. ► Model is based on Schur-Weyl duality and Young diagrams. ► 1→3 and 1→4 quantum cloner are studied in more details. ► The allowed region of fidelities for real pure states is the maximal one.