Researchers can now place single ions into solids

Physicists at Johannes Gutenberg University Mainz (JGU) led by Professor Ferdinand Schmidt-Kaler now have developed a method to implant precise numbers of individual dopant ions into a solid crystal. Their technique implants the rare earth element praseodymium into an yttrium-aluminum garnet crystal. These crystals were subsequently examined under a high-resolution confocal microscope in collaboration with a team of researchers headed by Professor Jörg Wrachtrup at the University of Stuttgart. They determined a positioning accuracy of 35 nanometers. In principle, this accuracy is already sufficient to implant arrays of dopant ions into components for future quantum processors.

The research results were published as a highlight in the current volume of the international journal Physical Review Letters and represent an important innovation with a wide potential for applications, as the method can be extended to other crystals and dopant atoms.