In Ospelkaus et al. [Nature 476, 181 (2011)] a microwave near-field quantum control of spin and motional degrees of freedom of one and two 25Mg+ ions enabled two-ion entanglement. In this report, we extend on the description of the experimental setup and calibration procedures for preparing these experiments. In particular, we discuss the design and characteristics of the surface-electrode trap and the microwave system that enabled the near-field control. We compare experimental findings of the microwave near-fields with numerical simulations. Moreover, we present a method utilizing oscillating-field gradients to compensate micromotion induced by the ponderomotive radio frequency potential in (linear) surface-electrode traps. Finally, we discuss the current limitations of the microwave-driven two-ion entangling gates.
Citation: Physical Review A
Pub Type: Journals
ion cooling, ion trapping, mechanical effects of light on ions, quantum computation architectures and implementations, zeeman and Stark effects