High trap frequency achieved with miniature 3D printed ion trap

Miniturized 3D printed trap is a good candidate for scalable quantum computing. The fabrication technology, two-photon polymerization direct laser writing, can print small, flexible and comlicated structures in micron scale, which allows one to combine the advantages of both macroscopic linear Paul traps and microscopic surface traps: high trap depth, high trap frequencies and scalability. Particularly, high trap frequencies speed up quantum operations and reduce the doppler cooled motional quanta to make state preparation faster. Here we present our work where we trapped Calcium 40 ions in a 3D printed Paul trap driven at 51.6 MHz, and achieved 24.15 MHz trap frequency, with stability parameter q of the Mathieu equation as high as 0.9. At around 20 MHz trap frequency, we are able to doppler cool the radial motional mode of trapped ions to a mean phonon number of 0.5, which could reduce the time needed for sideband cooling by an order of magnitude.