Science NewsCurated by RSF Research Staff Home > Science News > Physicists demonstrate violation of local causality in a quantum network 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. To determine whether local causality has been violated, physicists perform Bell tests, which attempt to violate Bell inequalities. If a Bell inequality is violated, then either locality or realism (or simply "local realism") has also been violated. There are dozens of different versions of Bell inequalities, but currently they all make the same assumption: that the correlations between particles all originate from a single common source. In real experiments, however, particles and their correlations can come from many different sources. To address this issue, the new paper considers a new type of Bell inequality that accounts for the fact that the two sources of states used in the experiment are independent, the so-called bilocality assumption. By violating this new type of Bell inequality, the researchers have for the first time violated bilocal causality, indicating the presence of non-bilocal correlations that are completely different than other types of quantum correlations. Read more: Article: https://phys.org/news/2017-04-physicists-violate-local-causality.html#jCp Inner Clocks and Future PredictionDecember 17, 2018The return of the green cometDecember 14, 2018Life in Deep Earth Totals 15 to 23 Billion Tonnes of Carbon—Hundreds of Times More than HumansDecember 13, 2018The elusive electric dipole momentDecember 12, 2018Quantum physics working at macroscopic scaleDecember 9, 2018 Sharing is caring - please share this with your friends: Facebook Twitter If you like this content, you will love the Resonance Academy.