Researchers achieve direct counterfactual quantum communication

(Phys.org)--In the non-intuitive quantum domain, the phenomenon of counterfactuality is defined as the transfer of a quantum state from one site to another without any quantum or classical particle transmitted between them. Counterfactuality requires a quantum channel between sites, which means that there exists a tiny probability that a quantum particle will cross the channel--in that event, the run of the system is discarded and a new one begins. It works because of the wave-particle duality t...