Physicists demonstrate new way to violate local causality
(Phys.org)—For the first time, physicists have experimentally demonstrated the violation of “bilocal causality”—a concept that is related to the more standard local causality, except that it accounts for the precise way in which physical systems are initially generated. The results show that it’s possible to violate local causality in an entirely new and more general way, which could lead to a potential new resource for quantum technologies.
The physicists, Gonzalo Carvacho et al., from institutions in Italy, Brazil, and Germany, have published a paper on the demonstration of the violation of bilocal causality in a recent issue of Nature Communications.
In general, the idea of local causality is usually taken for granted: objects can influence other objects only when they are physically close together, and any correlations between distant objects must have originated in the past when they were closer together. But in the quantum world, distant particles can be correlated in ways that are impossible for classical objects, unless these distant particles can somehow influence each other.