Laser System (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Part of the laser system used to alternately heat and cool the atom. Credit oto/©: AG QUANTUM Usage Restrictions This image may only be used in connection with the press release "Physicists build engine consisting of one Atom," issued by Johannes Gutenberg University Mainz on April 15, 2016. 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.