  Trapped ions in radio-frequency traps are among the leading approaches for
realizing quantum computers, due to high-fidelity quantum gates and long
coherence times. However, the use of radio-frequencies presents a number of
challenges to scaling, including requiring compatibility of chips with high
voltages, managing power dissipation and restricting transport and placement of
ions. By replacing the radio-frequency field with a 3 T magnetic field, we here
realize a micro-fabricated Penning ion trap which removes these restrictions.
We demonstrate full quantum control of an ion in this setting, as well as the
ability to transport the ion arbitrarily in the trapping plane above the chip.
This unique feature of the Penning micro-trap approach opens up a modification
of the Quantum CCD architecture with improved connectivity and flexibility,
facilitating the realization of large-scale trapped-ion quantum computing,
quantum simulation and quantum sensing.
