Past-Future (image) University of Vienna Share Print E-Mail Caption A new framework for quantum mechanics which does not assume a pre-existing global time. It demonstrates the possibility for two agents to perform a communication task in which it is impossible to tell with certainty who influences whom. Credit University of Vienna Usage Restrictions The image may only be used with appropriate caption or credit. Share Print E-Mail 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.