Two-photon Quantum Walk (IMAGE) University of Bristol Caption This is a graphic representation of the two-photon quantum walk. This unique behavior simulates the quantum walks in more complex spaces. The size, color and intensity of the points corresponds to the likelihood of the two photons appearing each location. The two areas of increased probability is a hallmark of quantum behavior. Credit Image by Proctor & Stevenson 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.