2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/89570The communication of directions using quantum states is a useful laboratory test for some basic facts of quantum information. For a system of spin-1/2 particles there are different quantum states that can encode directions. This information can later be decoded by means of a generalized measurement. In this talk we present the optimal strategies under different assumptions.Contribution to the ICQI, Rochester (NY) June 2001Quantum Physicstext