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Two-ion crystals constitute a platform for investigations of quantum naturethat can be extended to any ion species or charged particle provided one of theions in the crystal can be directly laser-cooled and manipulated with laserradiation. This paper presents the formation of two-ion crystals for quantummetrology in a 7-tesla open-ring Penning trap. $^{40}$Ca$^+$ ions are producedeither internally by photoionization or externally in a (Paul-trap) source,transported through the strong magnetic field gradient of the superconductingsolenoid, and captured in-flight with a mean kinetic energy of a fewelectronvolts with respect to the minimum of the Penning-trap potential well.Laser cooling of the two-ion crystal in a strong magnetic field towardsreaching the quantum regime is also presented with particular emphasis on thecooling of the radial modes.

Formation of Two-Ion Crystals by Injection from a Paul-Trap Source into a High-Magnetic-Field Penning Trap