Today, our article entitled “Formation of two-ion crystals by injection from a Paul-trap source into a high-magnetic-field Penning trap” by J. Berrocal, E. Altozano, F. Domínguez, M. J. Gutiérrez, J. Cerrillo, F. J. Fernández, M. Block, C. Ospelkaus, and D. Rodríguez has been published in the journal Physical Review A.

Link to the publication: https://link.aps.org/doi/10.1103/PhysRevA.105.052603

In this article we demonstrate the formation of two-ion calcium crystals in a 7-tesla open-ring Penning trap for quantum metrology applications. We show the production of calcium ions in Paul-trap source located outside the superconducting solenoid, which are then transported through the magnetic field gradient and captured in-flight in the Penning trap. We also show the laser cooling of individual calcium ions in such a strong magnetic field with a focus on the cooling of the radial modes of motion.