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Dense array of ions in microfabricated traps represent one possible way toscale up ion trap quantum computing. The ability to address individual ions isan important component of such a scheme. We demonstrate individual addressingof trapped ions in a microfabricated surface-electrode trap using a magneticfield gradient generated on-chip. A frequency splitting of 310(2) kHz for twoions separated by 5 um is achieved. Selective single qubit operations areperformed on one of two trapped ions with an average of 2.2+/-1.0% crosstalk.Coherence time as measured by the spin-echo technique is unaffected by thefield gradient.

Individual addressing of ions using magnetic field gradients in a surface-electrode ion trap