Operation of the CZ quantum gate (IMAGE) National Institutes of Natural Sciences Caption Fig. 3. Operation of the quantum gate. (Upper) When atom 1 is in the “0” state, nothing happens. When atom 1 is in the “1” state, the sign of the superposition of atom 2 is changed from positive to negative. This operation is at the heart of quantum algorithm that runs on quantum computers. Credit Image source: Dr. Takafumi Tomita (IMS) Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. 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.