A double Paul trap system for the electronic coupling of ions Raúl A. Rica, Francisco Domínguez, Manuel J. Gutiérrez, Javier Bañuelos, Jesús J. del Pozo and Daniel Rodríguez Eur. Phys. J. Special Topics, 227 3-4 (2018) 445-456 Published online: 28 September 2018 DOI: 10.1140/epjst/e2018-00105-x