A Quantum Tracking Device (IMAGE) Washington University in St. Louis Caption Kater Murch (right), assistant professor of physics at Washington University in St. Louis, and junior Chris Munley work with the equipment that can map a quantum device's trajectory between two points in quantum state space, a feat until recently considered impossible. Credit Joe Angeles/WUSTL Photos Usage Restrictions None 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.