Credit: I believe this widely-used image is public domain; it was obtained by download in 2015; source unknown Prof Andrew SteaneProfessor of Physics Research themeQuantum information and computation Sub departmentAtomic and Laser Physics Research groupsIon trap quantum computing Andrew.Steane@physics.ox.ac.uk Telephone: 01865 (2)72346,01865 (2)72385 Clarendon Laboratory, room 316.2 About Teaching Publications This page is a work in progress. For now please see the link below. link to teaching-related information for A. Steane