0502_SPINCHARGE_Fit347dc-lg.jpg (IMAGE) Rice University Caption To compare the speed of charge and spin waves, Rice University physicist Danyel Cavazos and colleagues built a quantum simulator that uses ultracold lithium atoms as stand-ins for electrons and a channel of light in place of a 1D electronic wire. Credit Photo by Jeff Fitlow/Rice University Usage Restrictions Must credit: Jeff Fitlow/Rice University 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.