Atoms (IMAGE) University of Bonn Caption Two atoms, initially prepared in different locations, exchange their positions along the blue path, whereas no exchange occurs along the red path. In quantum mechanics, it is possible that the atoms take simultaneously both ways. As a result of such a tricky manipulation, it is fundamentally impossible at the end to determine the origin of the atoms, and their spin orientations (denoted by arrows) become entangled. Credit © Andrea Alberti/Uni Bonn Usage Restrictions This image may be used with the press release. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.