Scientists at the University of São Paulo's Physics Institute (IFUSP) have demonstrated the entanglement of six light waves generated by an optical parametric oscillator (OPO). Entanglement — a phenomenon that occurs when groups of particles or waves interact in such a way that the quantum state of each particle or wave cannot be described independently of the others — could be used to transmit information between future quantum devices. In previous experiments, the team entangled two and three modes using the OPO. 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