Coupling of two quantum systems (IMAGE) Swiss Nanoscience Institute, University of Basel Caption Light is used to couple a vibrating membrane to a cloud of atoms in order to form a control loop. The two different quantum systems — consisting of the membrane and the spins — therefore regulate one another’s temperature with no need for external measurement. (Image: Department of Physics, University of Basel) Credit Departement of Physics, University of Basel Usage Restrictions only to be used when credits are named License Original 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.