Trapping and transforming ions in a surface-electrode chip trap

Trapped ions have long cohere time and are relatively easy to be operated, so they became one of the promising systems for quantum information processing. For scalable quantum information processing, a chip trap is under active consideration. The stable trapping and transformation of the ions in chip traps are necessary for the preparation and operation of the ions states with high fidelity. We designed a surface-electrode chip trap, and show it has excellent ability of trapping ions. Also we proposed a method to carry out equally spaced ions-string in a surface-electrode trap by feedback control. Based on these, we showed the separating and merging ions in the trap by the experiments.