2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/89627Entanglement is at the heart of fundamental tests of quantum mechanics like tests of Bell-inequalities and, as discovered lately, of quantum computation and communication. Their technological advance made entangled photons play an outstanding role in entanglement physics. We give a generalized concept of qubit entanglement and review the state of the art of photonic experiments.54 pages, 33 figures. Review article submitted to QIC (Rinton)Quantum Physicstext