Double Quantum Dot (IMAGE) University of Basel Caption The three lower and upper contacts trap up to two individual electrons, the spin states of which form the quantum-mechanical information unit. The lateral contacts act as sensors. Credit University of Basel Usage Restrictions Give appropriate credit. 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.