A ytterbium ion qubit (IMAGE) Optica Caption Using a lanthanide atom in a crystal to create Greenberger-Horne-Zeilinger quantum states Credit MAAYAN VISUALS Usage Restrictions None 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.