QUROPE Quantum Information Processing and Communication in Europe

We propose a planar architecture for scalable quantum information processing (QIP) which includes X-junctions through which particles can move without micromotion. This is achieved by adjusting radio frequency (rf) amplitudes to move an rf null along the legs of the junction. We provide proof-of-principle by transporting macroscopic particles in three dimensions via adjustable rf potentials in a 3D trap. For the proposed planar architecture, regularization techniques provide amplitude settings which guarantee a smooth transport through the X-junction. The amplitude settings respect the experimental boundary conditions due to maximal rf voltages and crosstalk. We also study the high spatial resolution of rf electrodes to split ion strings.